1
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Mishra AK, Willoughby J, Estes SL, Kohler KC, Brinkman KS. Impact of morphology and oxygen vacancy content in Ni, Fe co-doped ceria for efficient electrocatalyst based water splitting. NANOSCALE ADVANCES 2024; 6:4672-4682. [PMID: 39263402 PMCID: PMC11385549 DOI: 10.1039/d4na00500g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2024] [Accepted: 07/22/2024] [Indexed: 09/13/2024]
Abstract
Designing a highly efficient, low-cost, sustainable electrocatalyst for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) through water splitting is a current challenge for renewable energy technologies. This work presents a modified sol-gel route to prepare metal-ion(s) doped cerium oxide nanostructures as an efficient electrocatalyst for overall water splitting. Nickle (Ni) and iron (Fe) co-doping impacts the morphology in cerium oxide resulting in 5 nm nanoparticles with a mesoporous-like microstructure. The high level 20 mol% (1 : 1 ratio) of Ni + Fe bimetal-ion(s) doped CeO2 shows excellent HER and OER activities compared to the monodoped Fe/Ni and pristine CeO2. The co-doped catalysts required a low overpotential of 104 mV and 380 mV for HER and OER, respectively, in 1 M KOH, at a current density of 10 mA cm-2. The Tafel slopes of 95 mV dec-1 and 65 mV dec-1 were measured for HER and OER with the same representative samples which demonstrated excellent stability even after continuous operation for 20 hours in the alkaline medium. The unique morphology, enhanced oxygen vacancy (Ov) content and the synergistic effects of dopants in CeO2 play essential roles in enhancing the activities of Ni + Fe doped samples.
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Affiliation(s)
- Abhaya Kumar Mishra
- Department of Materials Science and Engineering, Clemson University Clemson SC 29634 USA
| | - Joshua Willoughby
- Department of Materials Science and Engineering, Clemson University Clemson SC 29634 USA
| | - Shanna L Estes
- Department of Environmental Engineering and Earth Sciences, Clemson University Anderson SC 29625 USA
| | - Keliann Cleary Kohler
- Advanced Materials Research Laboratory (AMRL), Clemson University Anderson SC 29625 USA
| | - Kyle S Brinkman
- Department of Materials Science and Engineering, Clemson University Clemson SC 29634 USA
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2
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Piliai L, Castro-Latorre P, Pchálek F, Oveysipoor S, Kosto Y, Khalakhan I, Skála T, Neyman KM, Alemany P, Vorochta M, Bruix A, Matvija P, Matolínová I. Electronic and Structural Properties of Thin Iron Oxide Films on CeO 2. ACS APPLIED MATERIALS & INTERFACES 2024; 16:46858-46871. [PMID: 39167683 PMCID: PMC11378155 DOI: 10.1021/acsami.4c05542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Modification of CeO2 (ceria) with 3d transition metals, particularly iron, has been proven to significantly enhance its catalytic efficiency in oxidation or combustion reactions. Although this phenomenon is widely reported, the nature of the iron-ceria interaction responsible for this improvement remains debated. To address this issue, we prepared well-defined model FeOx/CeO2(111) catalytic systems and studied their structure and interfacial electronic properties using photoelectron spectroscopy, scanning tunneling microscopy, and low-energy electron diffraction, coupled with density functional theory (DFT) calculations. Our results show that under ultrahigh vacuum conditions, Fe deposition leads to the formation of small FeOx clusters on the ceria surface. Subsequent annealing results in the growth of large amorphous FeOx particles and a 2D FeOx layer. Annealing in an oxygen-rich atmosphere further oxidizes iron up to the Fe3+ state and improves the crystallinity of both the 2D layer and the 3D particles. Our DFT calculations indicate that the 2D FeOx layer interacts strongly with the ceria surface, exhibiting structural corrugations and transferred electrons between Fe2+/Fe3+ and Ce4+/Ce3+ redox pairs. The novel 2D FeOx/CeO2(111) phase may explain the enhancement of the catalytic properties of CeO2 by iron. Moreover, the corrugated 2D FeOx layer can serve as a template for the ordered nucleation of other catalytically active metals, in which the redox properties of the 2D FeOx/CeO2(111) system are exploited to modulate the charge of the supported metals.
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Affiliation(s)
- Lesia Piliai
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Pablo Castro-Latorre
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Barcelona 08028, Spain
| | - František Pchálek
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Shiva Oveysipoor
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Yuliia Kosto
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
- Applied Physics and Semiconductor Spectroscopy, Brandenburg University of Technology Cottbus-Senftenberg, Konrad-Zuse-Strasse 1, Cottbus 03046, Germany
| | - Ivan Khalakhan
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Tomáš Skála
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Konstantin M Neyman
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Barcelona 08028, Spain
- ICREA (Institució Catalana de Recerca i Estudis Avançats), Barcelona 08010, Spain
| | - Pere Alemany
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Barcelona 08028, Spain
| | - Michael Vorochta
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Albert Bruix
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Barcelona 08028, Spain
| | - Peter Matvija
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
| | - Iva Matolínová
- Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 8 180 00, Czech Republic
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3
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Othman A, Gowda A, Andreescu D, Hassan MH, Babu SV, Seo J, Andreescu S. Two decades of ceria nanoparticle research: structure, properties and emerging applications. MATERIALS HORIZONS 2024; 11:3213-3266. [PMID: 38717455 DOI: 10.1039/d4mh00055b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/16/2024]
Abstract
Cerium oxide nanoparticles (CeNPs) are versatile materials with unique and unusual properties that vary depending on their surface chemistry, size, shape, coating, oxidation states, crystallinity, dopant, and structural and surface defects. This review encompasses advances made over the past twenty years in the development of CeNPs and ceria-based nanostructures, the structural determinants affecting their activity, and translation of these distinct features into applications. The two oxidation states of nanosized CeNPs (Ce3+/Ce4+) coexisting at the nanoscale level facilitate the formation of oxygen vacancies and defect states, which confer extremely high reactivity and oxygen buffering capacity and the ability to act as catalysts for oxidation and reduction reactions. However, the method of synthesis, surface functionalization, surface coating and defects are important factors in determining their properties. This review highlights key properties of CeNPs, their synthesis, interactions, and reaction pathways and provides examples of emerging applications. Due to their unique properties, CeNPs have become quintessential candidates for catalysis, chemical mechanical planarization (CMP), sensing, biomedical applications, and environmental remediation, with tremendous potential to create novel products and translational innovations in a wide range of industries. This review highlights the timely relevance and the transformative potential of these materials in addressing societal challenges and driving technological advancements across these fields.
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Affiliation(s)
- Ali Othman
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, USA.
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, USA.
| | - Akshay Gowda
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, USA.
| | - Daniel Andreescu
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, USA.
| | - Mohamed H Hassan
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, USA.
| | - S V Babu
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, USA.
| | - Jihoon Seo
- Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, USA.
| | - Silvana Andreescu
- Department of Chemistry and Biomolecular Science, Clarkson University, Potsdam, New York 13699-5810, USA.
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Wang F, Jin Y, Xue Y, Yu S, Liu N, Ma Q, Xu J, Xue B, Wei X. Mn-doped CeO 2 derived from Ce-MOF porous nanoribbons as highly active catalysts for the synthesis of dimethyl carbonate from CO 2 and methanol. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:47911-47922. [PMID: 39009818 DOI: 10.1007/s11356-024-34375-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 07/09/2024] [Indexed: 07/17/2024]
Abstract
It is desirable but challenging to develop highly-efficient catalysts for the direct synthesis of dimethyl carbonate (DMC) from methanol and CO2. The vacancy-mediated incorporation of heteroatom into surface reconstruction is an efficient method of defect engineering for enhancing the catalytic properties. In this work, manganese-doped cerium oxide porous nanoribbons (Mn/CeO2-BTC) were prepared derived from a Ce-BTC by a sacrificial template approach. It is found that the catalytic activity of Mn/CeO2-BTC catalysts can be readily controlled by varying the amount of Mn dopants and the as-synthesized 0.1-Mn/CeO2-BTC exhibited an outstanding activity for the synthesis of DMC from CO2 and methanol, which reached a high DMC yield (6.53 mmolDMC/gcat.) without any dehydrating agents. Based on characterization results, the enhanced performance may be attributed to the defective structures caused by Mn doping and the porous nanoribbons of the CeO2 crystals, which provide more surface oxygen vacancies and acidic-basic sites, favoring adsorption and activation of CO2 and methanol.
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Affiliation(s)
- Fei Wang
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China.
| | - Yulong Jin
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Yun Xue
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Shuihang Yu
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Na Liu
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Qingxiang Ma
- State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, P.R. China
| | - Jie Xu
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Bing Xue
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, School of Petrochemical and Engineering, Changzhou University, Changzhou, 213164, P.R. China
| | - Xuejiao Wei
- School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou, 213164, P.R. China
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5
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Chen X, Li C, Jiang M, Zhang J, Qian G. Enhanced Replenishment of Active Lattice Oxygen Using Chiral Copper Oxide. ACS APPLIED MATERIALS & INTERFACES 2024; 16:28517-28525. [PMID: 38769473 DOI: 10.1021/acsami.4c03699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Effective catalytic performance of the transition metal oxide is attributed to high specific surface areas, abundant surface oxygen atoms, and balanced valence ratios. Although the chirality of the transition metal has attracted attention, most studies have focused on optical application. A few chiral transition metal oxides were used as electrocatalysts and photocatalysts. The influence of the chiral catalysts on the thermal catalysis process has been less explored. In this study, Mn-loaded chiral (M/l-CuO and M/d-CuO) and achiral CuO (M/a-CuO) were synthesized and compared in the catalytic oxidization of toluene. Spectrally analyzed Mn was well-dispersed on both chiral and achiral CuO. l-CuO and d-CuO showed nanoflower-like chirality. The angles between each (001) plane of CuO were the source of chirality. The toluene turnover frequency (TOF) of the samples was in the order of Mn/d-CuO (5.6 × 10-5 s-1) > Mn/l-CuO (4.4 × 10-5 s-1) > Mn/a-CuO (3.2 × 10-5 s-1) at 240 °C, consistent with the order of the oxygen replenishment rate. The as-prepared catalysts had similar ratios of lattice oxygen/surface adsorbed oxygen, Mn3+/Mn4+, and Cu+/Cu2+. A higher TOF was attributed to chirality, which increased the lattice oxygen replenishment speed from the gaseous phase to the solid surface. Our study indicates gas-solid catalysis from a structure-activity viewpoint.
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Affiliation(s)
- Xinru Chen
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, P. R. China
| | - Chengyan Li
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, P. R. China
| | - Meijia Jiang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, P. R. China
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, P. R. China
| | - Guangren Qian
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, P. R. China
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6
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Xing Y, Wu J, Liu D, Zhang C, Han J, Wang H, Li Y, Hou X, Zhang L, Gao Z. Different metal (Mn, Fe, Co, Ni, and Zr) decorated Cu/CeO 2 catalysts for efficient CO oxidation in a rich CO 2/H 2 atmosphere. Phys Chem Chem Phys 2024; 26:11618-11630. [PMID: 38546226 DOI: 10.1039/d3cp06125f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
In this work, CuM/CeO2 (M = Mn, Fe, Co, Ni, and Zr) catalysts with a low Cu content of 1 wt% were purposely designed and prepared using the co-impregnation method. The samples were characterized using various techniques (TG-DTA, XRD, N2-adsorption/desorption measurements, H2-TPR, XPS and Raman spectroscopy) and CO preferential oxidation (CO-Prox) under H2/CO2-rich conditions was performed. The results have shown that enhanced catalytic performance was achieved upon the introduction of Mn, Co and Ni, and little impact was observed with Zr doping, but Fe showed a negative effect, as compared with the Cu/CeO2 catalyst. Characterization data revealed that the M doping strongly changed the surface composition, revealing the decreased Cu/Ce ratios on the surface, which could be accounted for by the formation of more M/Cu-O-Ce solid solution, or strong Cu-M interactions. When Mn was used, the obtained CuMn/CeO2 catalyst revealed the highest concentration of the oxygen vacancies and Ce3+ ions, which could be correlated well with its superior catalytic performance. Compared with the Cu/CeO2 catalyst, the CO conversion rate increased by 24.7% at a low temperature of 90 °C over the CuMn/CeO2 catalyst. At 130 °C, the maximum CO conversion was 94.7% and the CO2 selectivity was 78.9%. Conversely, the Fe doped Cu/CeO2 catalyst demonstrated the poorest catalytic activity, which was due to the blockage effect of Fe species on Cu showing a high Fe/Cu ratio of 1.9 on the surface.
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Affiliation(s)
- Yue Xing
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Jiaxin Wu
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Daosheng Liu
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Caishun Zhang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Jiao Han
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Honghao Wang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Yinfu Li
- Graduate School, Liaoning Petrochemical University, Fushun, Liaoning 113001, China
| | - Xiaoning Hou
- School of Chemistry and Materials Science, Shanxi Normal University, Taiyuan 030032, China
| | - Lei Zhang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
| | - Zhixian Gao
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, Liaoning 113001, China.
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7
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Wang H, Li Y, Han J, Zhang C, Wang H, Liu D, Hou X, Zhang L, Gao Z. Formation of superoxide and ozone-like species on Cu doped CeO 2(111) and their CO oxidation reactivity: a DFT study. Phys Chem Chem Phys 2023; 25:32557-32568. [PMID: 37999632 DOI: 10.1039/d3cp03885h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
The adsorption of O2 on Cu/CeO2(111) and the CO oxidation reactivity of the formed oxygen species were studied using the DFT method. The results showed that superoxide species (O2δ-), which directly interacted with Cu, formed when O2 adsorbed on the surface oxygen vacancies, while O2 adsorbed on the subsurface oxygen vacancies gave rise to ozone-like O3δ- species by combining with the nearest surface lattice oxygen (O1). PDOS showed that hybridization of the 2p orbitals between O2 and O1 formed a delocalized π bond, confirming the formation of O3δ-. For O2δ-, electrons on Cu and O1 transferred to O2 while the charge of Ce remained unchanged. However, for O3δ-, the transferred electrons were mainly from O1, and partially from O2, Ce1 and Ce2. It was very interesting that Cu also received a few electrons in the latter case. Compared with CO directly adsorbed on lattice oxygen, the two oxygen species were active for CO oxidation, forming CO2 or carbonates, and higher absolute adsorption energy was obtained with the interaction between CO and O3δ-. The findings of this study provide new insight on the CO oxidation reaction mechanism, facilitating an in-depth understanding of Cu-doped CeO2 catalysts.
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Affiliation(s)
- Hao Wang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Yuan Li
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Jiao Han
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Caishun Zhang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Honghao Wang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Daosheng Liu
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | | | - Lei Zhang
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
| | - Zhixian Gao
- School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China.
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Sodpiban O, Kessaratikoon T, Smith J, Ren G, Del Gobbo S, Das S, Chi M, D'Elia V, Gates BC. Catalysts Prepared from Atomically Dispersed Ce(III) on MgO Rival Bulk Ceria for CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2023; 15:55885-55894. [PMID: 37991323 DOI: 10.1021/acsami.3c13708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Atomically dispersed cerium catalysts on an inert, crystalline MgO powder support were prepared by using both Ce(III) and Ce(IV) precursors. The materials were used as catalysts for CO oxidation in a once-through flow reactor and characterized by atomic-resolution scanning transmission electron microscopy, X-ray absorption near-edge structure spectroscopy, X-ray photoelectron spectroscopy, and temperature-programmed reduction, among other techniques, before and after catalysis. The most active catalysts, formed from the precursor incorporating Ce(III), displayed performance similar to that reported for bulk ceria under comparable conditions. The catalyst provided stable time-on-stream performance for as long as it was kept on-stream, 2 days, increasing slightly in activity as the atomically dispersed cerium ions were transformed into ceria nanodomains represented as CeOx and having increased reducibility on the MgO support. The results suggest how highly dispersed supported ceria catalysts with low cerium loadings can be prepared and may pave the way for improved efficiencies of cerium utilization in oxidation catalysis.
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Affiliation(s)
- Ounjit Sodpiban
- VISTEC Advanced Laboratory for Environment-Related Inorganic and Organic Syntheses, Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Payupnai, WangChan, Rayong 21210, Thailand
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Tanika Kessaratikoon
- VISTEC Advanced Laboratory for Environment-Related Inorganic and Organic Syntheses, Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Payupnai, WangChan, Rayong 21210, Thailand
| | - Jacob Smith
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Guodong Ren
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Silvano Del Gobbo
- VISTEC Advanced Laboratory for Environment-Related Inorganic and Organic Syntheses, Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Payupnai, WangChan, Rayong 21210, Thailand
| | - Sonali Das
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
- Department of Chemical Engineering, Indian Institute of Technology, Bombay, Powai 400076, India
| | - Miaofang Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Valerio D'Elia
- VISTEC Advanced Laboratory for Environment-Related Inorganic and Organic Syntheses, Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Payupnai, WangChan, Rayong 21210, Thailand
| | - Bruce C Gates
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
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Fang S, Sun Y, Xu J, Zhang T, Wu Z, Li J, Gao E, Wang W, Zhu J, Dai L, Liu W, Zhang B, Zhang J, Yao S. Revealing the intrinsic nature of Ni-, Mn-, and Y-doped CeO 2 catalysts with positive, additive, and negative effects on CO oxidation using operando DRIFTS-MS. Dalton Trans 2023; 52:16911-16919. [PMID: 37927054 DOI: 10.1039/d3dt03001f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
The catalytic activity of a transition metal (host) oxide can be influenced by doping with a second cation (dopant), but the key factors dominating the activity of the doped catalyst are still controversial. Herein, CeO2 doped with Ni, Mn, and Y catalysts prepared using aerosol pyrolysis were used to demonstrate the positive, negative, and additive effects on CO oxidation as a model reaction. Various characterization results indicated that Ni, Mn, and Y had been successfully doped into the CeO2 lattice. The catalytic activities of each catalyst for CO conversion were in the order of Ni-CeO2 > Mn-CeO2 > CeO2 > Y-CeO2. Operando DRIFTS-MS and various characterization methods were applied to reveal the intrinsic nature of the doping effects. The accumulation rate of the surface bidentate carbonates determined the CO oxidation. A definition to evaluate the doping effect was proposed, which is anticipated to be useful for developing a rational catalyst with a high CO oxidation activity. The CO oxidation reactivities displayed strong correlations with the surface factors obtained from operando DRIFTS-MS analysis and the structure factors from XPS and Raman analyses.
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Affiliation(s)
- Shiyu Fang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
| | - Yan Sun
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
| | - Jiacheng Xu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- School of Material Science and Engineering, Changzhou University, Changzhou 213164, China
| | - Tiantian Zhang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
| | - Zuliang Wu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Jing Li
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Erhao Gao
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Wei Wang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Jiali Zhu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
| | - Lianxin Dai
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an 343100, China
| | - Weihua Liu
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an 343100, China
| | - Buhe Zhang
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an 343100, China
| | - Junwei Zhang
- Jiangxi Xintai Functional Materials Technology Co., Ltd., Ji'an 343100, China
| | - Shuiliang Yao
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China.
- School of Material Science and Engineering, Changzhou University, Changzhou 213164, China
- Key Laboratory of Advanced Plasma Catalysis Engineering for China Petrochemical Industry, Changzhou 213164, China
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10
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Ye Z, Liu Y, Nikiforov A, Ji J, Zhao B, Wang J. The research on CO oxidation over Ce-Mn oxides: The preparation method effects and oxidation mechanism. CHEMOSPHERE 2023:139130. [PMID: 37285972 DOI: 10.1016/j.chemosphere.2023.139130] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/02/2023] [Accepted: 06/03/2023] [Indexed: 06/09/2023]
Abstract
A series of CeO2-MnOx for highly efficient catalytical oxidation of carbon monoxide were prepared by citrate sol-gel (C), hydrothermal (H) and hydrothermal-citrate complexation (CH) methods. The outcome indicates that the catalyst generated using the CH technique (CH-1:8) demonstrated the greatest catalytic performance for CO oxidation with a T50 of 98 °C, and also good stability in 1400 min. Compared to the catalysts prepared by C and H method, CH-1:8 has the highest specific surface of 156.1 m2 g-1, and the better reducibility of CH-1:8 was also observed in CO-TPR. It is also observed the high ratio of adsorbed oxygen/lattice oxygen (1.5) in the XPS result. Moreover, characterizations by the TOF-SIMS method indicated that obtained catalyst CH-Ce/Mn = 1:8 had stronger interactions between Ce and Mn oxides, and the redox cycle of Mn3++Ce4+ ↔ Mn4++Ce3+ was a key process for CO adsorption and oxidation process. According to in-situ FTIR, the possible reaction pathway for CO was deduced in three ways. CO directly oxidize with O2 to CO2, CO adsorbed on Mn4+ and Ce3+ reacts with O to form intermediates (COO-) (T > 50 °C) and carbonates (T > 90 °C), which are further oxidized into CO2.
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Affiliation(s)
- Zhiping Ye
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou, 310014, PR China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing, 100084, PR China
| | - Yang Liu
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou, 310014, PR China
| | - Anton Nikiforov
- Ghent University, Faculty of Engineering, Department of Applied Physics, Research Unit Plasma Technology, Sint-Pietersnieuwstraat 41, 9000, Ghent, Belgium
| | - Jiayu Ji
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou, 310014, PR China
| | - Bo Zhao
- Zhejiang Tuna Environmental Science & Technology Co., Ltd, Shaoxing, 312071, PR China.
| | - Jiade Wang
- College of Environment, Zhejiang University of Technology, 18 Chaowang RD, Hangzhou, 310014, PR China.
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11
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Cha X, Wang X, Huang M, Cai D, Sun K, Jiang J, Zhou SF, Zhan G. Fabrication of supported Pt/CeO 2 nanocatalysts doped with different elements for CO oxidation: theoretical and experimental studies. Dalton Trans 2023; 52:3661-3670. [PMID: 36847219 DOI: 10.1039/d3dt00181d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Supported Pt/CeO2 catalysts have been widely used in carbon monoxide (CO) oxidation; however, the high oxygen vacancy formation energy (Evac) in the process leads to the poor performance of these catalysts. Herein, we explored different element (Pr, Cu, or N) doped CeO2 supports using Ce-based metal-organic frameworks (MOFs) as precursors via calcination treatment. The obtained CeO2 supports were used to load Pt nanoparticles. These catalysts were systematically characterized by various techniques, and they showed superior catalytic activity for CO oxidation compared to undoped catalysts which could be attributed to the formation of Ce3+, and high amounts of Oads/(Oads + Olat) and Ptδ+/Pttotal. Moreover, density functional theory calculations with on-site Coulomb interaction correction (DFT+U) were performed to provide atomic-scale insights into the reaction process by the Mars-van Krevelen (M-vK) mechanism, which revealed that the element-doped catalysts could simultaneously reduce the adsorption energies of CO and lower reaction energy barriers in the *OOCO associative pathway.
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Affiliation(s)
- Xingwen Cha
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Xueying Wang
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Mingzhen Huang
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Dongren Cai
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Kang Sun
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), 16 Suojin Five Village, Nanjing, Jiangsu, 210042, P. R. China
| | - Jianchun Jiang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF), 16 Suojin Five Village, Nanjing, Jiangsu, 210042, P. R. China
| | - Shu-Feng Zhou
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
| | - Guowu Zhan
- College of Chemical Engineering, Integrated Nanocatalysts Institute (INCI), Huaqiao University, 668 Jimei Avenue, Xiamen, Fujian, 361021, P. R. China.
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12
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Wang H, Duan W, Zhang R, Ma H, Ma C, Liang M, Zhao Y, Miao Z. Fabrication and catalytic properties of nanorod-shaped (Pt-Pd)/CeO 2 composites. RSC Adv 2023; 13:2811-2819. [PMID: 36756418 PMCID: PMC9847492 DOI: 10.1039/d2ra07395a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 12/19/2022] [Indexed: 01/19/2023] Open
Abstract
Nanorod-supported (Pt-Pd)/CeO2 catalysts were synthesized by a simple method of dealloying Al91.7Ce8 Pt X Pd0.3-X (X = 0, 0.075, 0.1, 0.15, 0.2, 0.3) alloy ribbons. SEM and TEM characterization implied that after calcination treatment, the achieved resultants exhibited interspersed nanorod structures with a rich distribution of nanopores. Catalytic tests showed that the (Pt0.1-Pd0.2)/CeO2 catalyst calcined at 300 °C exhibited the highest catalyst activity for CO oxidation when compared with other catalysts prepared at different noble metal ratios or calcined at other temperatures, whose complete reaction temperature was as low as 100 °C. The outstanding catalytic performance is ascribed to the stable framework structure, rich gas pathways and collaborative effect between the noble Pt and Pd bimetals.
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Affiliation(s)
- Haiyang Wang
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Wenyuan Duan
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Ruiyin Zhang
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Hao Ma
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Cheng Ma
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Miaomiao Liang
- School of Materials Science and Engineering, Xi'an Polytechnic UniversityXi'anShaanxi710048P. R. China
| | - Yuzhen Zhao
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing UniversityXi'an710123P. R. China
| | - Zongcheng Miao
- Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Key Laboratory of Organic Polymer Photoelectric Materials, School of Electronic Information, Xijing University Xi'an 710123 P. R. China.,School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University Xi'an Shaanxi 710072 P. R. China
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13
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Sun N, Xiang L, Zhuge B, Kan E, Yu N, Li L, Kuai L. Atomically Incorporating Ni into Mesoporous CeO 2 Matrix via Synchronous Spray-Pyrolysis as Efficient Noble-Metal-Free Catalyst for Low-Temperature CO Oxidation. Inorg Chem 2023; 62:782-791. [PMID: 36583676 DOI: 10.1021/acs.inorgchem.2c03293] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Low-temperature catalytic CO oxidation is an important chemical process in versatile applications, such as the H2 utilization for low-temperature H2 air fuel cells. Pt-group metal catalysts are efficient but highly cost-consuming. This work demonstrates an excellent and sixpenny catalyst with earth-abundant Ni and Ce, in which Ni ions are atomically incorporated into the CeO2 matrix (Ni-Ce-Ox) by synchronous spray-pyrolysis (SSP) of mixture nitrates of Ni and Ce. The Ni-Ce-Ox catalyst presents a mesoporous structure. Revealed by a model reaction of 1% CO, 1% O2, and 98% balance He at a space velocity of 13,200 mL/gcat/h, Ni-Ce-Ox catalysts display a typical volcano-shaped relationship between reactivity and Ni incorporation amount. The optimized Ni incorporation appears with a high Ni/Ce atomic ratio of 0.25, endowing the T50 (temperature corresponding to a CO conversion of 50%), which is lower-shifted by 165 °C than that of pristine CeO2 (266 °C). The density functional theory (DFT) calculations further indicate that the much-reduced oxygen vacancy formation energy at Ni-Ce single-atom sites boosted the adsorption activation of the CO molecule and therefore promoted the CO oxidation process. Besides, the2 Ni-Ce-Ox from the SSP method presents better performance than the counterparts from immersion and hydrothermal methods. This work paves a way to access efficient noble-metal-free catalysts for low-temperature CO oxidation.
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Affiliation(s)
- Na Sun
- School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Beijing Middle Road, Wuhu241000, China
| | - Linlin Xiang
- School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Beijing Middle Road, Wuhu241000, China
| | - Bingsen Zhuge
- School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Beijing Middle Road, Wuhu241000, China
| | - Erjie Kan
- School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Beijing Middle Road, Wuhu241000, China
| | - Nan Yu
- College of Chemistry and Materials Science, The Key Laboratory of Electrochemical Clean Energy of Anhui Higher Education Institutes, Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials, Anhui Normal University, Jiuhua South Road, Wuhu241002, China
| | - Lei Li
- Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing, Yangtze Normal University, Chongqing408100, China
| | - Long Kuai
- School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Beijing Middle Road, Wuhu241000, China
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14
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Landuyt A, Kumar PV, Yuwono JA, Bork AH, Donat F, Abdala PM, Müller CR. Uncovering the CO 2 Capture Mechanism of NaNO 3-Promoted MgO by 18O Isotope Labeling. JACS AU 2022; 2:2731-2741. [PMID: 36590255 PMCID: PMC9795564 DOI: 10.1021/jacsau.2c00461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/17/2022] [Accepted: 11/18/2022] [Indexed: 06/17/2023]
Abstract
MgO-based CO2 sorbents promoted with molten alkali metal nitrates (e.g., NaNO3) have emerged as promising materials for CO2 capture and storage technologies due to their low cost and high theoretical CO2 uptake capacities. Yet, the mechanism by which molten alkali metal nitrates promote the carbonation of MgO (CO2 capture reaction) remains debated and poorly understood. Here, we utilize 18O isotope labeling experiments to provide new insights into the carbonation mechanism of NaNO3-promoted MgO sorbents, a system in which the promoter is molten under operation conditions and hence inherently challenging to characterize. To conduct the 18O isotope labeling experiments, we report a facile and large-scale synthesis procedure to obtain labeled MgO with a high 18O isotope content. We use Raman spectroscopy and in situ thermogravimetric analysis in combination with mass spectrometry to track the 18O label in the solid (MgCO3), molten (NaNO3), and gas (CO2) phases during the CO2 capture (carbonation) and regeneration (decarbonation) reactions. We discovered a rapid oxygen exchange between CO2 and MgO through the reversible formation of surface carbonates, independent of the presence of the promoter NaNO3. On the other hand, no oxygen exchange was observed between NaNO3 and CO2 or NaNO3 and MgO. Combining the results of the 18O labeling experiments, with insights gained from atomistic calculations, we propose a carbonation mechanism that, in the first stage, proceeds through a fast, surface-limited carbonation of MgO. These surface carbonates are subsequently dissolved as [Mg2+···CO3 2-] ionic pairs in the molten NaNO3 promoter. Upon reaching the solubility limit, MgCO3 crystallizes at the MgO/NaNO3 interface.
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Affiliation(s)
- Annelies Landuyt
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, Eidgenössische Technische
Hochschule (ETH) Zürich, Zürich8092, Switzerland
| | - Priyank V. Kumar
- School
of Chemical Engineering, The University
of New South Wales (UNSW Sydney), Sydney, New South Wales2052Australia
| | - Jodie A. Yuwono
- School
of Chemical Engineering, The University
of New South Wales (UNSW Sydney), Sydney, New South Wales2052Australia
| | - Alexander H. Bork
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, Eidgenössische Technische
Hochschule (ETH) Zürich, Zürich8092, Switzerland
| | - Felix Donat
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, Eidgenössische Technische
Hochschule (ETH) Zürich, Zürich8092, Switzerland
| | - Paula M. Abdala
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, Eidgenössische Technische
Hochschule (ETH) Zürich, Zürich8092, Switzerland
| | - Christoph R. Müller
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, Eidgenössische Technische
Hochschule (ETH) Zürich, Zürich8092, Switzerland
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15
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Xu Y, Gao L, Ding Z. Synthesis and Oxygen Storage Capacities of Yttrium-Doped CeO 2 with a Cubic Fluorite Structure. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8971. [PMID: 36556775 PMCID: PMC9782740 DOI: 10.3390/ma15248971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 12/10/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Doping CeO2 with Y cations was achieved in this study using three strategies: doping only during the hydrothermal process (H-Y-doped CeO2), doping only during the impregnation process (I-Y-doped CeO2), and doping during both the hydrothermal and impregnation processes (H/I-Y-doped CeO2). During the three synthesis strategies of Y-doped CeO2, these Y ions could be incorporated into the CeO2 lattice in the +3 state while holding the cubic fluorite structure, and no impurity phases were detected. Pure CeO2 crystal itself contained a certain number of intrinsic VO defects, and Y-doping was beneficial for the creation of extrinsic VO defects. The relative concentrations of VO defects were quantified by the values of A592/A464 obtained from Raman spectra, which were 1.47, 0.93, and 1.16 for the H-Y-, I-Y-, and H/I-Y-doped CeO2, respectively, and were higher than that of the undoped one (0.67). Moreover, the OSCs of the three Y-doped CeO2 were enhanced, and the sequence of OSCs was: H-Y-doped CeO2 (0.372 mmol/g) > H/I-Y-doped CeO2 (0.353 mmol/g) > I-Y-doped CeO2 (0.248 mmol/g) > Undoped CeO2 (0.153 mmol/g); this result was in good agreement with the Raman spectroscopy results.
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Affiliation(s)
- Yaohui Xu
- Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614004, China
- Leshan West Silicon Materials Photovoltaic and New Energy Industry Technology Research Institute, Leshan 614000, China
| | - Liangjuan Gao
- College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Zhao Ding
- National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
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16
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Zedan AF, AlJaber AS, El-Shall MS. Facile Microwave Synthesis of Hierarchical Porous Copper Oxide and Its Catalytic Activity and Kinetics for Carbon Monoxide Oxidation. ACS OMEGA 2022; 7:44021-44032. [PMID: 36506176 PMCID: PMC9730479 DOI: 10.1021/acsomega.2c05399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 11/09/2022] [Indexed: 06/17/2023]
Abstract
The synthesis of copper oxide (CuO)-based nanomaterials has received a tremendous deal of interest in recent years. Particularly, the design and development of novel CuO structures with improved physical and chemical properties have attracted immense attention, especially for catalysis applications. We report on a rational, rapid, and surfactant-free microwave synthesis (MWS) of hierarchical porous copper oxide (HP-CuO) with a three-dimensional (3D) sponge-like topology using an MWS reactor. The activity of the microwave (MW)-synthesized HP-CuO catalysts for carbon monoxide (CO) oxidation was studied and compared to CuO prepared by the conventional heating method (CHM). Results showed that HP-CuO catalysts prepared by MWS for 10 and 30 min surpassed the CuO catalyst prepared by CHM, exhibiting T 80 of 98 and 115 °C, respectively, as compared to 185 °C of CuO prepared by CHM (T80 is the temperature corresponding to 80% CO conversion). In addition, the MW-synthesized HP-CuO catalysts outperformed the CHM-synthesized CuO, achieving a 100% CO conversion at 150 °C compared to 240 °C in the case of CuO prepared by CHM. Interestingly, the HP-CuO catalyst expressed workable CO conversion kinetics with a reaction rate of c.a.35 μmol s-1 g-1 at 150 °C and apparent activation energy (E a) of 82 kJ mol-1. The HP-CuO catalyst showed excellent cycling and long-term stabilities for CO oxidation up to 4 cycles and 72 h on the stream, respectively. The enhanced catalytic activity and stability of the HP-CuO catalyst appear to result from the unique topological and structural features of HP-CuO, which were revealed by SEM, XRD, Raman, BET, TGA, XPS, and TPR techniques.
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Affiliation(s)
- Abdallah F. Zedan
- National
Institute of Laser Enhanced Sciences, Cairo
University, Giza12613, Egypt
- Department
of Chemistry, Virginia Commonwealth University, Richmond, Virginia23284, United States
| | - Amina S. AlJaber
- Department
of Chemistry and Earth Sciences, Qatar University, Doha2713, Qatar
| | - M. Samy El-Shall
- Department
of Chemistry, Virginia Commonwealth University, Richmond, Virginia23284, United States
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17
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Fast photocatalytic oxidation of ciprofloxacin over Co3O4@CeO2 heterojunctions under visible-light. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Lashina EA, Slavinskaya EM, Stonkus OA, Stadnichenko AI, Romanenko AV, Boronin AI. The role of ionic and cluster active centers of Pt/CeO2 catalysts in CO oxidation. Experimental study and mathematical modeling. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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García-Vargas CE, Collinge G, Yun D, Lee MS, Muravev V, Su YQ, Pereira-Hernández XI, Jiang D, Glezakou VA, Hensen EJM, Rousseau R, Datye AK, Wang Y. Activation of Lattice and Adatom Oxygen by Highly Stable Ceria-Supported Cu Single Atoms. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carlos E. García-Vargas
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington99164, United States
- Environmental Molecular Sciences Laboratory, Richland, Washington99354, United States
| | - Gregory Collinge
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
| | - Dongmin Yun
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington99164, United States
| | - Mal-Soon Lee
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
| | - Valery Muravev
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MBEindhoven, The Netherlands
| | - Ya-Qiong Su
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MBEindhoven, The Netherlands
| | - Xavier Isidro Pereira-Hernández
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington99164, United States
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
| | - Dong Jiang
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington99164, United States
| | - Vassiliki-Alexandra Glezakou
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
| | - Emiel J. M. Hensen
- Laboratory of Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MBEindhoven, The Netherlands
| | - Roger Rousseau
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
| | - Abhaya K. Datye
- Department of Chemical and Biological Engineering and Center for Micro-engineered Materials, University of New Mexico, Albuquerque, New Mexico87131, United States
| | - Yong Wang
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington99164, United States
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington99354, United States
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20
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Effective CO2 methanation at ambient pressure over Lanthanides (La/Ce/Pr/Sm) modified cobalt-palygorskite composites. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102114] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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21
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Polychronopoulou K, AlKhoori S, AlBedwawi S, Alareeqi S, Hussien AGS, Vasiliades MA, Efstathiou AM, Petallidou KC, Singh N, Anjum DH, Vega LF, Baker MA. Decoupling the Chemical and Mechanical Strain Effect on Steering the CO 2 Activation over CeO 2-Based Oxides: An Experimental and DFT Approach. ACS APPLIED MATERIALS & INTERFACES 2022; 14:33094-33119. [PMID: 35820019 PMCID: PMC9335529 DOI: 10.1021/acsami.2c05714] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Doped ceria-based metal oxides are widely used as supports and stand-alone catalysts in reactions where CO2 is involved. Thus, it is important to understand how to tailor their CO2 adsorption behavior. In this work, steering the CO2 activation behavior of Ce-La-Cu-O ternary oxide surfaces through the combined effect of chemical and mechanical strain was thoroughly examined using both experimental and ab initio modeling approaches. Doping with aliovalent metal cations (La3+ or La3+/Cu2+) and post-synthetic ball milling were considered as the origin of the chemical and mechanical strain of CeO2, respectively. Experimentally, microwave-assisted reflux-prepared Ce-La-Cu-O ternary oxides were imposed into mechanical forces to tune the structure, redox ability, defects, and CO2 surface adsorption properties; the latter were used as key descriptors. The purpose was to decouple the combined effect of the chemical strain (εC) and mechanical strain (εM) on the modification of the Ce-La-Cu-O surface reactivity toward CO2 activation. During the ab initio calculations, the stability (energy of formation, EOvf) of different configurations of oxygen vacant sites (Ov) was assessed under biaxial tensile strain (ε > 0) and compressive strain (ε < 0), whereas the CO2-philicity of the surface was assessed at different levels of the imposed mechanical strain. The EOvf values were found to decrease with increasing tensile strain. The Ce-La-Cu-O(111) surface exhibited the lowest EOvf values for the single subsurface sites, implying that Ov may occur spontaneously upon Cu addition. The mobility of the surface and bulk oxygen anions in the lattice contributing to the Ov population was measured using 16O/18O transient isothermal isotopic exchange experiments; the maximum in the dynamic rate of 16O18O formation, Rmax(16O18O), was 13.1 and 8.5 μmol g-1 s-1 for pristine (chemically strained) and dry ball-milled (chemically and mechanically strained) oxides, respectively. The CO2 activation pathway (redox vs associative) was experimentally probed using in situ diffuse reflectance infrared Fourier transform spectroscopy. It was demonstrated that the mechanical strain increased up to 6 times the CO2 adsorption sites, though reducing their thermal stability. This result supports the mechanical actuation of the "carbonate"-bound species; the latter was in agreement with the density functional theory (DFT)-calculated C-O bond lengths and O-C-O angles. Ab initio studies shed light on the CO2 adsorption energy (Eads), suggesting a covalent bonding which is enhanced in the presence of doping and under tensile strain. Bader charge analysis probed the adsorbate/surface charge distribution and illustrated that CO2 interacts with the dual sites (acidic and basic ones) on the surface, leading to the formation of bidentate carbonate species. Density of states (DOS) studies revealed a significant Eg drop in the presence of double Ov and compressive strain, a finding with design implications in covalent type of interactions. To bridge this study with industrially important catalytic applications, Ni-supported catalysts were prepared using pristine and ball-milled oxides and evaluated for the dry reforming of methane reaction. Ball milling was found to induce modification of the metal-support interface and Ni catalyst reducibility, thus leading to an increase in the CH4 and CO2 conversions. This study opens new possibilities to manipulate the CO2 activation for a portfolio of heterogeneous reactions.
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Affiliation(s)
- Kyriaki Polychronopoulou
- Department
of Mechanical Engineering, Khalifa University
of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Sara AlKhoori
- Department
of Mechanical Engineering, Khalifa University
of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Shaima AlBedwawi
- Department
of Mechanical Engineering, Khalifa University
of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Seba Alareeqi
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Department
of Chemical Engineering and Research and Innovation Center on CO2
and Hydrogen (RICH Center), Khalifa University
of Science and Technology, Abu
Dhabi 127788, United Arab
Emirates
| | - Aseel G. S. Hussien
- Department
of Mechanical Engineering, Khalifa University
of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Michalis A. Vasiliades
- Department
of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, 1 University Avenue, University Campus, 2109 Nicosia, Cyprus
| | - Angelos M. Efstathiou
- Department
of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, 1 University Avenue, University Campus, 2109 Nicosia, Cyprus
| | - Klito C. Petallidou
- Department
of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, 1 University Avenue, University Campus, 2109 Nicosia, Cyprus
| | - Nirpendra Singh
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Department
of Physics, Khalifa University of Science
and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Dalaver H. Anjum
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Department
of Physics, Khalifa University of Science
and Technology, Abu Dhabi 127788, United Arab Emirates
| | - Lourdes F. Vega
- Center
for Catalysis and Separations (CeCaS Center), Khalifa University of Science and Technology, Abu Dhabi 127788, United Arab Emirates
- Department
of Chemical Engineering and Research and Innovation Center on CO2
and Hydrogen (RICH Center), Khalifa University
of Science and Technology, Abu
Dhabi 127788, United Arab
Emirates
| | - Mark A. Baker
- The
Surface
Analysis Laboratory, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 4DL, U.K.
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22
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Promotional Effect of Pt-Doping on the Catalytic Performance of Pt−CeO2 Catalyst for CO Oxidation. Catalysts 2022. [DOI: 10.3390/catal12050529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Abstract
Growing interest in the development of a hydrogen economy means that CO oxidation is increasingly important for upgrading H2-rich fuel gas streams for fuel cells. CeO2-supported catalysts are the most promising candidates for the catalytic oxidation of CO because of their high activity. In the present work, DFT+U calculations were performed to investigate the stability and CO oxidation reactivity of Ptn (n = 1−4) clusters supported on CeO2(111) (Pt/CeO2) and Pt-doped CeO2(111) (Pt/(Pt−Ce)O2) surfaces. The Pt clusters showed similar nucleation behavior on both CeO2 and (Pt−Ce)O2 surfaces. Further, the formation of oxygen vacancies (Ov) was facilitated because of surface charge depletion caused by the dopant Pt. Our DFT results suggest that the interfacial OV plays an important role in the CO oxidation reaction cycle, and the calculated energy barrier for the CO oxidation reaction on the Pt/(Pt−Ce)O2 surface is approximately 0.43 eV lower than that on the surface of the undoped catalyst, suggesting enhanced CO oxidation reactivity. Therefore, the chemical modification of the CeO2 support via doping is an effective strategy for improving the catalytic performance of Pt/CeO2.
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23
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Oxidative coupling of methane on Li/CeO2 based catalysts: Investigation of the effect of Mg- and La-doping of the CeO2 support. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112157] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Zeng M, Wang X, Yang Q, Chu X, Chen Z, Li Z, Redshaw C, Wang C, Peng Y, Wang N, Zhu Y, Wu YA. Activating Surface Lattice Oxygen of a Cu/Zn 1-xCu xO Catalyst through Interface Interactions for CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:9882-9890. [PMID: 35142210 DOI: 10.1021/acsami.1c24321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Surface lattice oxygen in metal oxides is a common participant in many chemical reactions. Given this, the structural design of catalysts to activate lattice oxygen and moreover investigations into the effect of lattice oxygen on reaction pathways are hot topics. With this in mind, herein we prepare CuO-Zn1-xCuxO (ZCO) nanofibers akin to the Trojan horse legend and via an in situ reduction obtain activated Cu/Zn1-xCuxO (Cu/ZCO) nanofibers. X-ray absorption spectroscopy and X-ray photoelectron spectroscopy reveal that surface lattice oxygen of Cu/ZCO is effectively activated from inert O2- to reactive O2-x. This activation stems from the enhanced covalence of metal-oxygen bonds and the electron transfer between Cu and the support. Online mass spectrometry reveals that Cu/ZCO with activated lattice oxygen exhibits a higher Mars-van Krevelen reaction efficiency during the CO oxidation process. This study offers a new avenue to engineer interface interactions, given, as highlighted here, the importance of surface lattice oxygen in oxide supports during the catalytic process.
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Affiliation(s)
- Minli Zeng
- Guangxi Institute Fullerene Technology (GIFT), Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, P. R. China
| | - Xiyang Wang
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Qilei Yang
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Xuefeng Chu
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
- Key Laboratory of Architectural Cold Climate Energy Management, Ministry of Education, Jilin Jianzhu University, Changchun 130118, P. R. China
| | - Zuolong Chen
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Zhen Li
- Guangxi Institute Fullerene Technology (GIFT), Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, P. R. China
| | - Carl Redshaw
- Plastics Collaboratory, Department of Chemistry, University of Hull, Hull HU6 7RX, U.K
| | - Chao Wang
- Key Laboratory of Architectural Cold Climate Energy Management, Ministry of Education, Jilin Jianzhu University, Changchun 130118, P. R. China
| | - Yue Peng
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Nannan Wang
- Guangxi Institute Fullerene Technology (GIFT), Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, P. R. China
| | - Yanqiu Zhu
- Guangxi Institute Fullerene Technology (GIFT), Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, P. R. China
| | - Yimin A Wu
- Department of Mechanical and Mechatronics Engineering, Waterloo Institute for Nanotechnology, Materials Interface Foundry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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25
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Woźniak P, Małecka MA, Kraszkiewicz P, Miśta W, Bezkrovnyi O, Chinchilla L, Trasobares S. Confinement of nano-gold in 3D hierarchically structured gadolinium-doped ceria mesocrystal: synergistic effect of chemical composition and structural hierarchy in CO and propane oxidation. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01214f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gadolinium-doped ceria hierarchical gold catalyst shows four-fold TOF increase compared to undoped non-hierarchical system, proving the synergistic effect of doping and structural hierarchy in propane oxidation.
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Affiliation(s)
- Piotr Woźniak
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Małgorzata A. Małecka
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Piotr Kraszkiewicz
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Włodzimierz Miśta
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Oleksii Bezkrovnyi
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
| | - Lidia Chinchilla
- Departamento de Ciencia de los Materiales e Ing. Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Universitario de Puerto Real, 11510, Cádiz, Spain
| | - Susana Trasobares
- Departamento de Ciencia de los Materiales e Ing. Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Universitario de Puerto Real, 11510, Cádiz, Spain
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26
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Lin F, Wang Q, Huang X, Jin J. Investigation of chlorine-poisoning mechanism of MnO x/TiO 2 and MnO x-CeO 2/TiO 2 catalysts during o-DCBz catalytic decomposition: Experiment and first-principles calculation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 298:113454. [PMID: 34365187 DOI: 10.1016/j.jenvman.2021.113454] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 07/16/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
The catalytic activity and stability of MnOx/TiO2 and MnOx-CeO2/TiO2 catalysts for the oxidative degradation of 1,2-dichorobenzene (o-DCBz) at low temperatures (≤275 °C) were experimentally examined. The chlorine (Cl) poisoning mechanism of the catalysts was also clarified based on the catalyst characterization combined with theoretical calculations. Experimental results show that the MnOx/TiO2 catalyst is considerably deactivated during o-DCBz catalytic decomposition, mainly due to the chlorination of the catalytic active component. Ce addition and high temperature can effectively promote the resistance of MnOx/TiO2 catalyst to Cl poisoning. Density functional theory (DFT) calculations in the framework of first-principles reveal that Cl atom prefers to anchor on surface oxygen vacancy (OV) rather than on top site of Mn atom. The adsorption of Cl atom on surface OV hinders the dissociated adsorption of O2 on surface OV and interrupts the regeneration of the surface reactive oxygen species. The adsorption of Cl atom on top site of Mn atom increases the formation energy of surface OV and damages the surface Lewis acid sites which act as the important adsorption sites for o-DCBz molecules. Ce addition causes Cl atom to adsorb preferentially onto the OV around Ce atom, which weakens the interaction between Cl atom and Mn atom. Consequently, the chlorination of the MnOx species is prevented and the oxygen mobility of the catalyst is guaranteed to some extent.
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Affiliation(s)
- Feng Lin
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Qiulin Wang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China.
| | - Xiaoniu Huang
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Jing Jin
- School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China
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27
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Basahel SN, Medkhali AH, Mokhtar M, Narasimharao K. Noble metal (Pd, Pt and Rh) incorporated LaFeO3 perovskite oxides for catalytic oxidative cracking of n-propane. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.11.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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28
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Miran HA, Jaf ZN, Altarawneh M, Jiang ZT. An Insight into Geometries and Catalytic Applications of CeO 2 from a DFT Outlook. Molecules 2021; 26:6485. [PMID: 34770889 PMCID: PMC8588098 DOI: 10.3390/molecules26216485] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 11/18/2022] Open
Abstract
Rare earth metal oxides (REMOs) have gained considerable attention in recent years owing to their distinctive properties and potential applications in electronic devices and catalysts. Particularly, cerium dioxide (CeO2), also known as ceria, has emerged as an interesting material in a wide variety of industrial, technological, and medical applications. Ceria can be synthesized with various morphologies, including rods, cubes, wires, tubes, and spheres. This comprehensive review offers valuable perceptions into the crystal structure, fundamental properties, and reaction mechanisms that govern the well-established surface-assisted reactions over ceria. The activity, selectivity, and stability of ceria, either as a stand-alone catalyst or as supports for other metals, are frequently ascribed to its strong interactions with the adsorbates and its facile redox cycle. Doping of ceria with transition metals is a common strategy to modify the characteristics and to fine-tune its reactive properties. DFT-derived chemical mechanisms are surveyed and presented in light of pertinent experimental findings. Finally, the effect of surface termination on catalysis by ceria is also highlighted.
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Affiliation(s)
- Hussein A. Miran
- Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, Baghdad 10071, Iraq;
| | - Zainab N. Jaf
- Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, Baghdad 10071, Iraq;
| | - Mohammednoor Altarawneh
- Department of Chemical and Petroleum Engineering, United Arab Emirates University, Sheikh Khalifa Bin Zayed Street, Al-Ain 15551, United Arab Emirates
| | - Zhong-Tao Jiang
- Surface Analysis and Materials Engineering Research Group, College of Science, Health, Engineering and Education, Murdoch University, Murdoch, WA 6150, Australia;
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29
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Siakavelas G, Charisiou N, AlKhoori A, AlKhoori S, Sebastian V, Hinder S, Baker M, Yentekakis I, Polychronopoulou K, Goula M. Highly selective and stable Ni/La-M (M=Sm, Pr, and Mg)-CeO2 catalysts for CO2 methanation. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101618] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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30
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Liu Z, Wang Q, Wu J, Zhang H, Liu Y, Zhang T, Tian H, Zeng S. Active Sites and Interfacial Reducibility of Cu xO/CeO 2 Catalysts Induced by Reducing Media and O 2/H 2 Activation. ACS APPLIED MATERIALS & INTERFACES 2021; 13:35804-35817. [PMID: 34313106 DOI: 10.1021/acsami.1c09332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The development of a highly efficient and stable catalyst for preferential oxidation of CO for the commercialization of proton-exchange membrane fuel cells has been a result of continuous effort. The main challenge is the simultaneous control of abundant active sites and interfacial reducibility over the catalyst CuxO/CeO2. Here, we report a strategy to modulate porosity, active sites, and O-vacancy sites (OV) by reducing media and O2/H2 activation. O2-pretreated CeO2-supported Cu catalysts unequivocally demonstrate the low-temperature activity owing to the excess concentrations of Cu+ and Cu2+ as well as the relative population of Ce3+ and O-vacancy sites at the surface. O2 activation improves the Cu2+ diffusion into the CeO2 lattice to generate the synergistic effect and induces the formation of electron-enriched Cu2+-OV-Ce3+ sites, which accelerate the activation and dissociation of CO/O2 and the formation of reactive oxygen species during catalysis. Density function theory (DFT) calculations reveal that CO adsorbs on Cu2O {110} and CuO {111} with relatively optimal adsorption energy and longer C-Cu lengths in contrast to that on Cu {111}, favoring the adsorption and desorption of CO. These are crucial for ongoing CO oxidation, producing CO2 by the Mars-van Krevelen mechanism.
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Affiliation(s)
- Ze Liu
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Qi Wang
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Jinfang Wu
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Heng Zhang
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Yang Liu
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Tiantian Zhang
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Haoyuan Tian
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
| | - Shanghong Zeng
- Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China
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31
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Zedan AF, Gaber S, AlJaber AS, Polychronopoulou K. CO Oxidation at Near-Ambient Temperatures over TiO 2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO 2 Morphology. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1675. [PMID: 34202357 PMCID: PMC8306827 DOI: 10.3390/nano11071675] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 05/16/2021] [Accepted: 05/20/2021] [Indexed: 12/14/2022]
Abstract
Significant improvement of the catalytic activity of palladium-based catalysts toward carbon monoxide (CO) oxidation reaction has been achieved through alloying and using different support materials. This work demonstrates the promoting effects of the nanointerface and the morphological features of the support on the CO oxidation reaction using a Pd-Cu/TiO2 catalyst. Pd-Cu catalysts supported on TiO2 were synthesized with wet chemical approaches and their catalytic activities for CO oxidation reaction were evaluated. The physicochemical properties of the prepared catalysts were studied using standard characterization tools including SEM, EDX, XRD, XPS, and Raman. The effects of the nanointerface between Pd and Cu and the morphology of the TiO2 support were investigated using three different-shaped TiO2 nanoparticles, namely spheres, nanotubes, and nanowires. The Pd catalysts that are modified through nanointerfacing with Cu and supported on TiO2 nanowires demonstrated the highest CO oxidation rates, reaching 100% CO conversion at temperature regime down to near-ambient temperatures of ~45 °C, compared to 70 °C and 150 °C in the case of pure Pd and pure Cu counterpart catalysts on the same support, respectively. The optimized Pd-Cu/TiO2 nanowires nanostructured system could serve as efficient and durable catalyst for CO oxidation at near-ambient temperature.
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Affiliation(s)
- Abdallah F. Zedan
- National Institute of Laser Enhanced Science, Cairo University, Main Campus, Giza 12613, Egypt
| | - Safa Gaber
- Center for Catalysis and Separations, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates;
| | | | - Kyriaki Polychronopoulou
- Center for Catalysis and Separations, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates;
- Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab Emirates
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32
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Ayub NA, Bahruji H, Mahadi AH. Barium promoted Ni/Sm 2O 3 catalysts for enhanced CO 2 methanation. RSC Adv 2021; 11:31807-31816. [PMID: 35496871 PMCID: PMC9041535 DOI: 10.1039/d1ra04115k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 09/14/2021] [Indexed: 11/21/2022] Open
Abstract
Low temperature CO2 methanation is a favorable pathway to achieve high selectivity to methane while increasing the stability of the catalysts. A Ba promoted Ni/Sm2O3 catalyst was investigated for CO2 methanation at atmospheric pressure with the temperature ranging from 200–450 °C. 5Ni–5Ba/Sm2O3 showed significant enhancement of CO2 conversion particularly at temperatures ≤ 300 °C compared to Ni/Sm2O3. Incorporation of Ba into 5Ni/Sm2O3 improved the basicity of the catalysts and transformed the morphology of Sm2O3 from random structure into uniform groundnut shape nanoparticles. The uniformity of Sm2O3 created interparticle porosity that may be responsible for efficient heat transfer during a long catalytic reaction. Ba is also postulated to catalyze oxygen vacancy formation on Sm2O3 under a reducing environment presumably via isomorphic substitution. The disappearance of a high temperature (∼600 °C) reduction peak in H2-TPR analysis revealed the reducibility of NiO following impregnation with Ba. However, further increasing the Ba loading to 15% formed BaNiO3–BaNiO2.36 phases which consequently reduced the activity of the Ni–Ba/Sm2O3 catalyst at low temperature. Ni was suggested to segregate from BaNiO3–BaNiO2.36 at high temperature thus exhibiting comparable activity with Ni/Sm2O3 at 450 °C. Low temperature CO2 methanation on 5Ni–5Ba/Sm2O3 is a favorable pathway to achieve high selectivity to methane while increasing the stability of the catalysts.![]()
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Affiliation(s)
- Nur Athirah Ayub
- Centre of Advanced Material and Energy Sciences, Universiti Brunei Darussalam Jalan Tungku Link, BE 1410, Brunei Darussalam
| | - Hasliza Bahruji
- Centre of Advanced Material and Energy Sciences, Universiti Brunei Darussalam Jalan Tungku Link, BE 1410, Brunei Darussalam
| | - Abdul Hanif Mahadi
- Centre of Advanced Material and Energy Sciences, Universiti Brunei Darussalam Jalan Tungku Link, BE 1410, Brunei Darussalam
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