1
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Sheikh KA, Zevaco TA, Jelic J, Studt F, Bender M. Efficient noble metal promoted bimetallic cobalt catalysts in the selective synthesis of acetaldehyde dimethyl acetal. RSC Adv 2023; 13:22698-22709. [PMID: 37502823 PMCID: PMC10369129 DOI: 10.1039/d3ra02784h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/29/2023] [Indexed: 07/29/2023] Open
Abstract
Herein we report the one-pot cobalt catalysed synthesis of the dimethylacetal of acetaldehyde from synthesis gas and methanol. The product can be used as a fuel additive either as it is or after transacetalisation with long-chain alcohols. The product is obtained at moderate temperatures in good selectivities and high CO-conversions. A variation of the promotor metal (Au, Pt, Pd, and Ru) and of the support (γ-Al2O3 and CeO2) in the catalyst was conducted, which showed a great impact of both the support and promotor on the activity and structure of the catalyst. Furthermore, a specific variation of temperatures and pressure for the most active catalyst and a model catalyst was conducted giving an interesting insight into ongoing processes.
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Affiliation(s)
- Kalim A Sheikh
- Karlsruher Institut für Technologie (KIT) Eggenstein-Leopoldshafen Germany
- BASF SE Ludwigshafen Germany
| | - Thomas A Zevaco
- Karlsruher Institut für Technologie (KIT) Eggenstein-Leopoldshafen Germany
| | - Jelena Jelic
- Karlsruher Institut für Technologie (KIT) Eggenstein-Leopoldshafen Germany
| | - Felix Studt
- Karlsruher Institut für Technologie (KIT) Eggenstein-Leopoldshafen Germany
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2
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In situ diffraction monitoring of nanocrystals structure evolving during catalytic reaction at their surface. Sci Rep 2023; 13:1469. [PMID: 36702875 PMCID: PMC9879985 DOI: 10.1038/s41598-023-28557-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 01/20/2023] [Indexed: 01/27/2023] Open
Abstract
With decreasing size of crystals the number of their surface atoms becomes comparable to the number of bulk atoms and their powder diffraction pattern becomes sensitive to a changing surface structure. On the example of nanocrystalline gold supported on also nanocrystalline [Formula: see text] we show evolution of (a) the background pattern due to chemisorption phenomena, (b) peak positions due to adsorption on nonstoichiometric [Formula: see text] particles, (c) Au peaks intensity. The results of the measurements, complemented with mass spectrometry gas analysis, point to (1) a multiply twinned structure of gold, (2) high mobility of Au atoms enabling transport phenomena of Au atoms to the surface of ceria while varying the amount of Au in the crystalline form, and (3) reversible [Formula: see text] peaks position shifts on exposure to He-X-He where X is O2, H2, CO or CO oxidation reaction mixture, suggesting solely internal alternations of the [Formula: see text] crystal structure. We found no evidence of ceria lattice oxygen being consumed/supplied at any stage of the process. The work shows possibility of structurally interpreting different contributions to the multi-phase powder diffraction pattern during a complex physico-chemical process, including effects of physi-, chemisorption and surface evolution. It shows a way to structurally interpret heterogeneous catalytic reactions even if no bulk phase transition is involved.
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3
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Sun Y, Polo‐Garzon F, Bao Z, Moon J, Huang Z, Chen H, Chen Z, Yang Z, Chi M, Wu Z, Liu J, Dai S. Manipulating Copper Dispersion on Ceria for Enhanced Catalysis: A Nanocrystal-Based Atom-Trapping Strategy. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2104749. [PMID: 35048561 PMCID: PMC8922119 DOI: 10.1002/advs.202104749] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/18/2021] [Indexed: 05/12/2023]
Abstract
Due to tunable redox properties and cost-effectiveness, copper-ceria (Cu-CeO2 ) materials have been investigated for a wide scope of catalytic reactions. However, accurately identifying and rationally tuning the local structures in Cu-CeO2 have remained challenging, especially for nanomaterials with inherent structural complexities involving surfaces, interfaces, and defects. Here, a nanocrystal-based atom-trapping strategy to access atomically precise Cu-CeO2 nanostructures for enhanced catalysis is reported. Driven by the interfacial interactions between the presynthesized Cu and CeO2 nanocrystals, Cu atoms migrate and redisperse onto the CeO2 surface via a solid-solid route. This interfacial restructuring behavior facilitates tuning of the copper dispersion and the associated creation of surface oxygen defects on CeO2 , which gives rise to enhanced activities and stabilities catalyzing water-gas shift reaction. Combining soft and solid-state chemistry of colloidal nanocrystals provide a well-defined platform to understand, elucidate, and harness metal-support interactions. The dynamic behavior of the supported metal species can be further exploited to realize exquisite control and rational design of multicomponent nanocatalysts.
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Grants
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, Catalysis Science Program
- DE-AC02-06CH11357 U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Contract No.
- Scientific User Facilities Division, Office of Basic Sciences, U. S. Department of Energy
- U. S. Department of Energy Office of Science User Facility
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Affiliation(s)
- Yifan Sun
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Felipe Polo‐Garzon
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Zhenghong Bao
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Jisue Moon
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Zhennan Huang
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Hao Chen
- Department of ChemistryThe University of TennesseeKnoxvilleTN37996USA
| | - Zitao Chen
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Zhenzhen Yang
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Miaofang Chi
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Zili Wu
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
- Center for Nanophase Materials SciencesOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Jue Liu
- Neutron Scattering DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
| | - Sheng Dai
- Chemical Sciences DivisionOak Ridge National LaboratoryOak RidgeTN37831USA
- Department of ChemistryThe University of TennesseeKnoxvilleTN37996USA
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4
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Li Z, Piankova D, Yang Y, Kumagai Y, Zschiesche H, Jonsson M, Tarakina NV, Soroka IL. Radiation Chemistry Provides Nanoscopic Insights into the Role of Intermediate Phases in CeO
2
Mesocrystal Formation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202112204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhuofeng Li
- Department of Chemistry School of Engineering Sciences in Chemistry, Biotechnology and Health KTH Royal Institute of Technology 10044 Stockholm Sweden
| | - Diana Piankova
- Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Yi Yang
- Department of Chemistry School of Engineering Sciences in Chemistry, Biotechnology and Health KTH Royal Institute of Technology 10044 Stockholm Sweden
| | - Yuta Kumagai
- Nuclear Science and Engineering Center (Japan) Atomic Energy Agency 2–4 Shirane Shirakata, Tokai-mura, Naka-gun Ibaraki 319-1195 Japan
| | - Hannes Zschiesche
- Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Mats Jonsson
- Department of Chemistry School of Engineering Sciences in Chemistry, Biotechnology and Health KTH Royal Institute of Technology 10044 Stockholm Sweden
| | - Nadezda V. Tarakina
- Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
| | - Inna L. Soroka
- Department of Chemistry School of Engineering Sciences in Chemistry, Biotechnology and Health KTH Royal Institute of Technology 10044 Stockholm Sweden
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5
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Rossi MA, Vieira LH, Rasteiro LF, Fraga MA, Assaf JM, Assaf EM. Promoting effects of indium doped Cu/CeO 2 catalysts on CO 2 hydrogenation to methanol. REACT CHEM ENG 2022. [DOI: 10.1039/d2re00033d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Combining catalyst modification by indium doping and chemometric optimization, the Cu/CeO2 system showed high selectivity to methanol (99.3%) with no CO formation during CO2 hydrogenation.
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Affiliation(s)
- Marco A. Rossi
- São Carlos Institute of Chemistry (IQSC), University of São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP: 13566-590, São Carlos, SP, Brazil
| | - Luiz H. Vieira
- São Carlos Institute of Chemistry (IQSC), University of São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP: 13566-590, São Carlos, SP, Brazil
- Chemical Engineering Department, São Carlos Federal University, Rod. Washington Luiz, km 235 – SP 310, CEP: 13565-905, São Carlos, SP, Brazil
| | - Letícia F. Rasteiro
- São Carlos Institute of Chemistry (IQSC), University of São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP: 13566-590, São Carlos, SP, Brazil
| | - Marco A. Fraga
- Instituto Nacional de Tecnologia (INT/MCTIC), Av. Venezuela, 82/518, Saúde, CEP: 20081-312, Rio de Janeiro, RJ, Brazil
| | - José M. Assaf
- Chemical Engineering Department, São Carlos Federal University, Rod. Washington Luiz, km 235 – SP 310, CEP: 13565-905, São Carlos, SP, Brazil
| | - Elisabete M. Assaf
- São Carlos Institute of Chemistry (IQSC), University of São Paulo (USP), Av. Trabalhador São-Carlense 400, CEP: 13566-590, São Carlos, SP, Brazil
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6
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Li Z, Piankova D, Yang Y, Kumagai Y, Zschiesche H, Jonsson M, Tarakina NV, Soroka IL. Radiation Chemistry Provides Nanoscopic Insights into the Role of Intermediate Phases in CeO 2 Mesocrystal Formation. Angew Chem Int Ed Engl 2021; 61:e202112204. [PMID: 34860450 PMCID: PMC9303918 DOI: 10.1002/anie.202112204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Indexed: 11/18/2022]
Abstract
The role of intermediate phases in CeO2 mesocrystal formation from aqueous CeIII solutions subjected to γ‐radiation was studied. Radiolytically formed hydroxyl radicals convert soluble CeIII into less soluble CeIV. Transmission electron microscopy (TEM) and X‐ray diffraction studies of samples from different stages of the process allowed the identification of several stages in CeO2 mesocrystal evolution following the oxidation to CeIV: (1) formation of hydrated CeIV hydroxides, serving as intermediates in the liquid‐to‐solid phase transformation; (2) CeO2 primary particle growth inside the intermediate phase; (3) alignment of the primary particles into “pre‐mesocrystals” and subsequently to mesocrystals, guided by confinement of the amorphous intermediate phase and accompanied by the formation of “mineral bridges”. Further alignment of the obtained mesocrystals into supracrystals occurs upon slow drying, making it possible to form complex hierarchical architectures.
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Affiliation(s)
- Zhuofeng Li
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - Diana Piankova
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Yi Yang
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - Yuta Kumagai
- Nuclear Science and Engineering Center (Japan) Atomic Energy Agency, 2-4 Shirane, Shirakata, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan
| | - Hannes Zschiesche
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Mats Jonsson
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
| | - Nadezda V Tarakina
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Inna L Soroka
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044, Stockholm, Sweden
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7
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Fiuza TER, Gonçalves DS, Gomes IF, Zanchet D. CeO2-supported Au and AuCu catalysts for CO oxidation: Impact of activation protocol and residual chlorine on the active sites. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Chen G, Zhao Z, Widenmeyer M, Frömling T, Hellmann T, Yan R, Qu F, Homm G, Hofmann JP, Feldhoff A, Weidenkaff A. A comprehensive comparative study of CO2-resistance and oxygen permeability of 60 wt % Ce0.8M0.2O2– (M = La, Pr, Nd, Sm, Gd) - 40 wt % La0.5Sr0.5Fe0.8Cu0.2O3– dual-phase membranes. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119783] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Deblonde GJP, Zavarin M, Kersting AB. The coordination properties and ionic radius of actinium: A 120-year-old enigma. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.214130] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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10
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Panchal M, Callison J, Skukauskas V, Gianolio D, Cibin G, York APE, Schuster ME, Hyde TI, Collier P, Catlow CRA, Gibson EK. Operando XAFS investigation on the effect of ash deposition on three-way catalyst used in gasoline particulate filters and the effect of the manufacturing process on the catalytic activity. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:284001. [PMID: 33949972 DOI: 10.1088/1361-648x/abfe16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
Platinum group metals such as palladium and rhodium based catalysts are currently being implemented in gasoline particulate filter (GPF) autoexhaust after treatment systems. However, little is known about how the trapped particulate matter, such as the incombustible ash, interacts with the catalyst and so may affect its performance. Thisoperandostudy follows the evolution of the Pd found in two different model GPF systems: one containing ash components extracted from a GPF and another from a catalyst washcoat prior to adhesion onto the GPF. We show that the catalytic activity of the two systems vary when compared with a 0 g ash containing GPF. Compared to the 0 g ash sample the 20 g ash containing sample had a higher CO light off temperature, in addition, an oscillation profile for CO, CO2and O2was observed, which is speculated to be a combination of CO oxidation, C deposition via a Boudouard reaction and further partial oxidation of the deposited species to CO. During the ageing procedure the washcoat sample reduces NO at a lower temperature than the 0 g ash sample. However, post ageing the 0 g ash sample recovers and both samples reduce NO at 310 °C. In comparison, the 20 g ash GPF sample maintains a higher NO reduction temperature of 410 °C post ageing, implying that the combination of high temperature ageing and presence of ash has an irreversible negative effect on catalyst performance.
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Affiliation(s)
- Monik Panchal
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0FA, United Kingdom
| | - June Callison
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0FA, United Kingdom
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, United Kingdom
| | - Vainius Skukauskas
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0FA, United Kingdom
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - Diego Gianolio
- Diamond Light Source, Harwell Science & Innovation Campus, Oxfordshire OX11 0DE, United Kingdom
| | - Giannantonio Cibin
- Diamond Light Source, Harwell Science & Innovation Campus, Oxfordshire OX11 0DE, United Kingdom
| | - Andrew P E York
- Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading, RG4 9NH, United Kingdom
| | - Manfred E Schuster
- Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading, RG4 9NH, United Kingdom
| | - Timothy I Hyde
- Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading, RG4 9NH, United Kingdom
| | - Paul Collier
- Johnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading, RG4 9NH, United Kingdom
| | - C Richard A Catlow
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0FA, United Kingdom
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, United Kingdom
| | - Emma K Gibson
- UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0FA, United Kingdom
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
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11
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Chong S, Riley BJ, Nelson ZJ. Crystalline compounds for remediation of rare-earth fission products: A review. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.01.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Vamvakeros A, Coelho AA, Matras D, Dong H, Odarchenko Y, Price SWT, Butler KT, Gutowski O, Dippel AC, Zimmermann M, Martens I, Drnec J, Beale AM, Jacques SDM. DLSR: a solution to the parallax artefact in X-ray diffraction computed tomography data. J Appl Crystallogr 2020. [DOI: 10.1107/s1600576720013576] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A new tomographic reconstruction algorithm is presented, termed direct least-squares reconstruction (DLSR), which solves the well known parallax problem in X-ray-scattering-based experiments. The parallax artefact arises from relatively large samples where X-rays, scattered from a scattering angle 2θ, arrive at multiple detector elements. This phenomenon leads to loss of physico-chemical information associated with diffraction peak shape and position (i.e. altering the calculated crystallite size and lattice parameter values, respectively) and is currently the major barrier to investigating samples and devices at the centimetre level (scale-up problem). The accuracy of the DLSR algorithm has been tested against simulated and experimental X-ray diffraction computed tomography data using the TOPAS software.
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13
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Ilieva L, Petrova P, Pantaleo G, Zanella R, Sobczak J, Lisowski W, Ivanov I, Kaszkur Z, Liotta L, Venezia A, Tabakova T. Impact of ceria loading on the preferential CO oxidation over gold catalysts on CeO2/Al2O3 and Y-doped CeO2/Al2O3 supports prepared by mechanical mixing. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.06.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Hope M, Zhang B, Zhu B, Halat DM, MacManus-Driscoll JL, Grey CP. Revealing the Structure and Oxygen Transport at Interfaces in Complex Oxide Heterostructures via 17O NMR Spectroscopy. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:7921-7931. [PMID: 32982045 PMCID: PMC7513580 DOI: 10.1021/acs.chemmater.0c02698] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 08/18/2020] [Indexed: 05/24/2023]
Abstract
Vertically aligned nanocomposite (VAN) films, comprising nanopillars of one phase embedded in a matrix of another, have shown great promise for a range of applications due to their high interfacial areas oriented perpendicular to the substrate. In particular, oxide VANs show enhanced oxide-ion conductivity in directions that are orthogonal to those found in more conventional thin-film heterostructures; however, the structure of the interfaces and its influence on conductivity remain unclear. In this work, 17O NMR spectroscopy is used to study CeO2-SrTiO3 VAN thin films: selective isotopic enrichment is combined with a lift-off technique to remove the substrate, facilitating detection of the 17O NMR signal from single atomic layer interfaces. By performing the isotopic enrichment at variable temperatures, the superior oxide-ion conductivity of the VAN films compared to the bulk materials is shown to arise from enhanced oxygen mobility at this interface; oxygen motion at the interface is further identified from 17O relaxometry experiments. The structure of this interface is solved by calculating the NMR parameters using density functional theory combined with random structure searching, allowing the chemistry underpinning the enhanced oxide-ion transport to be proposed. Finally, a comparison is made with 1% Gd-doped CeO2-SrTiO3 VAN films, for which greater NMR signal can be obtained due to paramagnetic relaxation enhancement, while the relative oxide-ion conductivities of the phases remain similar. These results highlight the information that can be obtained on interfacial structure and dynamics with solid-state NMR spectroscopy, in this and other nanostructured systems, our methodology being generally applicable to overcome sensitivity limitations in thin-film studies.
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Affiliation(s)
- Michael
A. Hope
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United
Kingdom
| | - Bowen Zhang
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Bonan Zhu
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - David M. Halat
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United
Kingdom
| | - Judith L. MacManus-Driscoll
- Department
of Materials Science and Metallurgy, University
of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Clare P. Grey
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United
Kingdom
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15
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Kannan K, Radhika D, Nesaraj AS, Revathi V, Sadasivuni KK. A simple chemical precipitation of ceria based (Sm doped-CGO) nanocomposite: structural and electrolytic behaviour for LT-SOFCs. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-3035-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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16
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Chong S, Riley BJ, Nelson ZJ. Dehydration synthesis and crystal structure of terbium oxychloride, TbOCl. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2020; 76:621-624. [PMID: 32431920 PMCID: PMC7199267 DOI: 10.1107/s2056989020004387] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 03/30/2020] [Indexed: 11/18/2022]
Abstract
Terbium oxychloride, TbOCl, was synthesized via the simple heat-treatment of TbCl3·6H2O and its structure was determined by refinement against X-ray powder diffraction data. TbOCl crystallizes with the matlockite (PbFCl) structure in the tetragonal space group P4/nmm and is composed of alternating (001) layers of (TbO)n and n Cl−. Terbium oxychloride, TbOCl, was synthesized via the simple heat-treatment of TbCl3·6H2O and its structure was determined by refinement against X-ray powder diffraction data. TbOCl crystallizes with the matlockite (PbFCl) structure in the tetragonal space group P4/nmm and is composed of alternating (001) layers of (TbO)n and n Cl−. The unit-cell parameters, unit-cell volume, and density were compared to the literature data of other isostructural rare-earth oxychlorides in the same space group and showed good agreement when compared to the calculated trendlines.
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Affiliation(s)
- Saehwa Chong
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Brian J Riley
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Zayne J Nelson
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
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17
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Zito CA, Perfecto TM, Dippel AC, Volanti DP, Koziej D. Low-Temperature Carbon Dioxide Gas Sensor Based on Yolk-Shell Ceria Nanospheres. ACS APPLIED MATERIALS & INTERFACES 2020; 12:17745-17751. [PMID: 32250100 DOI: 10.1021/acsami.0c01641] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Monitoring carbon dioxide (CO2) levels is extremely important in a wide range of applications. Although metal oxide-based chemoresistive sensors have emerged as a promising approach for CO2 detection, the development of efficient CO2 sensors at low temperature remains a challenge. Herein, we report a low-temperature hollow nanostructured CeO2-based sensor for CO2 detection. We monitor the changes in the electrical resistance after CO2 pulses in a relative humidity of 70% and show the high performance of the sensor at 100 °C. The yolk-shell nanospheres have not only 2 times higher sensitivity but also significantly increased stability and reversibility, faster response times, and greater CO2 adsorption capacity than commercial ceria nanoparticles. The improvements in the CO2 sensing performance are attributed to hollow and porous structure of the yolk-shell nanoparticles, allowing for enhanced gas diffusion and high specific surface area. We present an easy strategy to enhance the electrical and sensing properties of metal oxides at a low operating temperature that is desirable for practical applications of CO2 sensors.
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Affiliation(s)
- Cecilia A Zito
- Laboratory of Materials for Sustainability (LabMatSus), São Paulo State University (UNESP), Rua Cristóvão Colombo 2265, 15054000 São José do Rio Preto, Brazil
- Center for Hybrid Nanostructures (CHyN), Institute of Nanostructure and Solid State Physics, University of Hamburg, Luruper Chaussee 149, 22607 Hamburg, Germany
| | - Tarcísio M Perfecto
- Laboratory of Materials for Sustainability (LabMatSus), São Paulo State University (UNESP), Rua Cristóvão Colombo 2265, 15054000 São José do Rio Preto, Brazil
| | - Ann-Christin Dippel
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - Diogo P Volanti
- Laboratory of Materials for Sustainability (LabMatSus), São Paulo State University (UNESP), Rua Cristóvão Colombo 2265, 15054000 São José do Rio Preto, Brazil
| | - Dorota Koziej
- Center for Hybrid Nanostructures (CHyN), Institute of Nanostructure and Solid State Physics, University of Hamburg, Luruper Chaussee 149, 22607 Hamburg, Germany
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Balaji S, Mandal BK, Vinod Kumar Reddy L, Sen D. Biogenic Ceria Nanoparticles (CeO 2 NPs) for Effective Photocatalytic and Cytotoxic Activity. Bioengineering (Basel) 2020; 7:bioengineering7010026. [PMID: 32183157 PMCID: PMC7148453 DOI: 10.3390/bioengineering7010026] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 02/21/2020] [Accepted: 03/02/2020] [Indexed: 01/30/2023] Open
Abstract
Ceria nanoparticles (CeO2 NPs) are generally considered in various functional applications, such as catalysts in fuel cells, sensors, and antioxidant and oxidase-like enzymes in the biological environment. The CeO2 NPs were synthesized using the E. globulus leaf extract-mediated hydrothermal technique. The synthesized NPs were characterized by various analytical instruments including powder X-ray diffractometer (PXRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and dynamic light scattering (DLS) analysis. The XRD results showed an average NPs sizes of 13.7 nm. Cytotoxic study results showed an IC50 value of 45.5 µg/L for A549 and 58.2 µg/L for HCT 116, indicating that CeO2 NPs are more toxic to A549 compared to HCT116 cell lines. The generation of ROS was responsible for its cytotoxic activity against cancer cell lines. Specific surface area (40.96 m2/g) and pore diameter (7.8 nm) were measured using Brunauer-Emmett-Teller (BET) nitrogen adsorption-desorption isotherms. CeO2 NPs with a high surface area were used as photocatalyst in degrading sunset yellow (SY) dye under UV-irradiation and 97.3% of the dye was degraded within 90 min. These results suggest that the synthesized CeO2 NPs could be used as a good photocatalyst as well as a cytotoxic agent against human cancer cell lines.
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Affiliation(s)
- Siripireddy Balaji
- Trace Elements Speciation Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India;
| | - Badal Kumar Mandal
- Trace Elements Speciation Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India;
- Correspondence: ; Tel.: +91-4162202339; Fax: +91-4162243092
| | - L. Vinod Kumar Reddy
- Cellular and Molecular Therapeutics Laboratory, Centre for Biomaterials, Cellular and Molecular Theranostics, Vellore Institute of Technology, Vellore 632014, India; (L.V.K.R.); (D.S.)
| | - Dwaipayan Sen
- Cellular and Molecular Therapeutics Laboratory, Centre for Biomaterials, Cellular and Molecular Theranostics, Vellore Institute of Technology, Vellore 632014, India; (L.V.K.R.); (D.S.)
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19
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Thornber SM, Mottram LM, Mason AR, Thompson P, Stennett MC, Hyatt NC. Solubility, speciation and local environment of chlorine in zirconolite glass–ceramics for the immobilisation of plutonium residues. RSC Adv 2020; 10:32497-32510. [PMID: 35516487 PMCID: PMC9056643 DOI: 10.1039/d0ra04938g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 08/03/2020] [Indexed: 11/21/2022] Open
Abstract
Understanding chlorine speciation and incorporation in glass ceramic wasteforms underpins future treatment of contaminated plutonium residues.
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Affiliation(s)
- Stephanie M. Thornber
- Immobilisation Science Laboratory
- Department of Materials Science & Engineering
- The University of Sheffield
- Sheffield S1 3JD
- UK
| | - Lucy M. Mottram
- Immobilisation Science Laboratory
- Department of Materials Science & Engineering
- The University of Sheffield
- Sheffield S1 3JD
- UK
| | - Amber R. Mason
- Immobilisation Science Laboratory
- Department of Materials Science & Engineering
- The University of Sheffield
- Sheffield S1 3JD
- UK
| | | | - Martin C. Stennett
- Immobilisation Science Laboratory
- Department of Materials Science & Engineering
- The University of Sheffield
- Sheffield S1 3JD
- UK
| | - Neil C. Hyatt
- Immobilisation Science Laboratory
- Department of Materials Science & Engineering
- The University of Sheffield
- Sheffield S1 3JD
- UK
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20
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Hope MA, Halat DM, Lee J, Grey CP. A 17O paramagnetic NMR study of Sm 2O 3, Eu 2O 3, and Sm/Eu-substituted CeO 2. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2019; 102:21-30. [PMID: 31226536 DOI: 10.1016/j.ssnmr.2019.05.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 06/09/2023]
Abstract
Paramagnetic solid-state NMR of lanthanide (Ln) containing materials can be challenging due to the high electron spin states possible for the Ln f electrons, which result in large paramagnetic shifts, and these difficulties are compounded for 17O due to the low natural abundance and quadrupolar character. In this work, we present examples of 17O NMR experiments for lanthanide oxides and strategies to overcome these difficulties. In particular, we record and assign the 17O NMR spectra of monoclinic Sm2O3 and Eu2O3 for the first time, as well as performing density functional theory (DFT) calculations to gain further insight into the spectra. The temperature dependence of the Sm3+ and Eu3+ magnetic susceptibilities are investigated by measuring the 17O shift of the cubic sesquioxides over a wide temperature range, which reveal non-Curie temperature dependence due to the presence of low-lying electronic states. This behaviour is reproduced by calculating the electron spin as a function of temperature, yielding shifts which agree well with the experimental values. Using the understanding of the magnetic behaviour gained from the sesquioxides, we then explore the local oxygen environments in 15 at% Sm- and Eu-substituted CeO2, with the 17O NMR spectrum exhibiting signals due to environments with zero, one and two nearest neighbour Ln ions, as well as further splitting due to oxygen vacancies. Finally, we extract an activation energy for oxygen vacancy motion in these systems of 0.35 ± 0.02 eV from the Arrhenius temperature dependence of the 17O T1 relaxation constants, which is found to be independent of the Ln ion within error. The relation of this activation energy to literature values for oxygen diffusion in Ln-substituted CeO2 is discussed to infer mechanistic information which can be applied to further develop these materials as solid-state oxide-ion conductors.
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Affiliation(s)
- Michael A Hope
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
| | - David M Halat
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, 94720, United States
| | - Jeongjae Lee
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK
| | - Clare P Grey
- Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, UK.
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21
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Morrison TD, Wood ES, Weck PF, Kim E, Woo SO, Nelson AT, Naugle DG. A comprehensive assessment of the low-temperature thermal properties and thermodynamic functions of CeO 2. J Chem Phys 2019; 151:044202. [PMID: 31370517 DOI: 10.1063/1.5110178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Reported is an experimental and computational investigation of the low temperature heat capacity, thermodynamic functions, and thermal conductivity of stoichiometric, polycrystalline CeO2. The experimentally measured heat capacity at T < 15 K provides an important correction to the historically accepted experimental values, and the low temperature thermal conductivity serves as the most comprehensive data set at T < 400 K available. Below 10 K, the heat capacity is observed to obey the Debye T3 law, with a Debye temperature of ΘD = 455 K. The entropy, enthalpy, and Gibbs free energy functions are obtained from the experimental heat capacity and compared with predictions from Hubbard-corrected density functional perturbation theory calculations using the Perdew, Burke, and Ernzerhof parameterization revised for solids. The thermal conductivity is determined using the Maldonado continuous measurement technique, along with laser flash analysis, and analyzed according to the Klemens-Callaway model.
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Affiliation(s)
- Tyler D Morrison
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - Elizabeth Sooby Wood
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, Texas 78249-1644, USA
| | - Phillippe F Weck
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87123, USA
| | - Eunja Kim
- Department of Physics and Astronomy, University of Nevada-Las Vegas, Las Vegas, Nevada 89154, USA
| | - Sung Oh Woo
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - Andrew T Nelson
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - Donald G Naugle
- Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
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22
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Ramadhan RS, Kockelmann W, Minniti T, Chen B, Parfitt D, Fitzpatrick ME, Tremsin AS. Characterization and application of Bragg-edge transmission imaging for strain measurement and crystallographic analysis on the IMAT beamline. J Appl Crystallogr 2019. [DOI: 10.1107/s1600576719001730] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
This paper presents a series of experiments to characterize the performance of the new IMAT beamline at the ISIS pulsed neutron source and provides examples to showcase the potential applications of Bragg-edge transmission imaging on the instrument. The characterization includes determination of the IMAT spectral and spatial resolutions through calibration measurements, and also determination of the precision and the accuracy of Bragg-edge analysis for lattice parameters of ceramics, metals and textured engineering alloys through high-temperature measurements. A novel Bragg-edge analysis method based on the cross-correlation of different Bragg edges has been developed to provide an estimate of the change in lattice parameter, which is especially useful for measurements of textured samples. Three different applications of the Bragg-edge transmission imaging technique are presented, including strain mapping, texture mapping and obtaining crystallographic information,i.e. the dependence on temperature of the Debye–Waller factor. The experimental results demonstrate the ability of the IMAT beamline to provide accurate strain measurements with uncertainties as low as 90 µ∊ with reasonable measurement time, while characteristic materials parameters can be mapped across the sample with a spatial resolution of 300–600 µm for a strain map and down to ∼90 µm for a texture map.
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23
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Self- regeneration of Au/CeO 2 based catalysts with enhanced activity and ultra-stability for acetylene hydrochlorination. Nat Commun 2019; 10:914. [PMID: 30796236 PMCID: PMC6385229 DOI: 10.1038/s41467-019-08827-5] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 01/31/2019] [Indexed: 11/09/2022] Open
Abstract
Replacement of Hg with non-toxic Au based catalysts for industrial hydrochlorination of acetylene to vinyl chloride is urgently required. However Au catalysts suffer from progressive deactivation caused by auto-reduction of Au(I) and Au(III) active sites and irreversible aggregation of Au(0) inactive sites. Here we show from synchrotron X-ray absorption, STEM imaging and DFT modelling that the availability of ceria(110) surface renders Au(0)/Au(I) as active pairs. Thus, Au(0) is directly involved in the catalysis. Owing to the strong mediating properties of Ce(IV)/Ce(III) with one electron complementary redox coupling reactions, the ceria promotion to Au catalysts gives enhanced activity and stability. Total pre-reduction of Au species to inactive Au nanoparticles of Au/CeO2&AC when placed in a C2H2/HCl stream can also rapidly rejuvenate. This is dramatically achieved by re-dispersing the Au particles to Au(0) atoms and oxidising to Au(I) entities, whereas Au/AC does not recover from the deactivation.
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24
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Maslakov KI, Teterin YA, Ryzhkov MV, Popel AJ, Teterin AY, Ivanov KE, Kalmykov SN, Petrov VG, Petrov PK, Farnan I. The electronic structure and the nature of the chemical bond in CeO2. Phys Chem Chem Phys 2018; 20:16167-16175. [DOI: 10.1039/c8cp01442f] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The scheme of the outer and inner valence molecular orbitals of CeO812−, reflecting the nearest environment of Ce4+ in CeO2.
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Affiliation(s)
| | - Yury A. Teterin
- Chemistry Department
- Lomonosov Moscow State University
- Moscow
- Russia
- NRC “Kurchatov Institute”
| | - Mikhail V. Ryzhkov
- Institute of Solid State Chemistry
- Ural Department of RAS
- Ekaterinburg
- Russia
| | | | | | | | - Stepan N. Kalmykov
- Chemistry Department
- Lomonosov Moscow State University
- Moscow
- Russia
- NRC “Kurchatov Institute”
| | | | - Peter K. Petrov
- Department of Materials and London Centre for Nanotechnology
- Imperial College London
- London
- UK
| | - Ian Farnan
- Department of Earth Sciences
- University of Cambridge
- Cambridge
- UK
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25
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Meng C, Ding X, Zhao J, Li W, Ren C, Yang H. Preparation and characterization of cerium-gadolinium monazites as ceramics for the conditioning of minor actinides. PROGRESS IN NUCLEAR ENERGY 2016. [DOI: 10.1016/j.pnucene.2016.01.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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26
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El Fray M, Strzalkowska D, Mandoli C, Pagliari F, Di Nardo P, Traversa E. Influence of ceria nanoparticles on chemical structure and properties of segmented polyesters. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 53:15-22. [PMID: 26042685 DOI: 10.1016/j.msec.2015.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 03/14/2015] [Accepted: 04/10/2015] [Indexed: 10/23/2022]
Abstract
In this work, we present new nanocomposite materials derived from segmented copolyesters, comprising ethylene terephthalate (PET) segments and dimerized linoleic acid (DLA), and nanometric cerium oxide particles (CeO2). Nanoparticles were incorporated in situ during polycondensation in various concentrations, from 0.1 up to 0.6 wt.%. It was found that preparation of nanocomposites in situ, during polycondensation, had no significant influence on changes in segmental composition as determined from (1)H and (13)C, as well as 2D NMR. Thermal analysis and calculated degree of crystallinity showed that increasing concentration of ceria nanoparticles lead to an increase in mass content of PET crystallites in hard segments. The XRD investigations also showed an increased intensity of characteristic signals with increasing ceria concentration. Simultaneously, the incorporation of CeO2 led to an increase in tensile strength and elongation at break, indicating a reinforcing and plasticizing effect of ceria nanoparticles. However, the modulus at 10% strain decreased with increasing amount of nanoparticles. The in vitro culture of human cardiac progenitor cells (hCPCs) on the new materials indicated a homogenous cell displacement across the samples after 5 days with no signs of cytotoxicity, indicating good biocompatibility in vitro of CeO2-based nanocomposites and a potential for biomedical applications.
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Affiliation(s)
- M El Fray
- West Pomeranian University of Technology, Szczecin, Polymer Institute, Division of Biomaterials and Microbiological Technologies, Al. Piastów 45, 70-311 Szczecin, Poland.
| | - D Strzalkowska
- West Pomeranian University of Technology, Szczecin, Polymer Institute, Division of Biomaterials and Microbiological Technologies, Al. Piastów 45, 70-311 Szczecin, Poland
| | - C Mandoli
- International Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - F Pagliari
- Laboratory of Molecular and Cellular Cardiology, Department of Internal Medicine, University of Rome "Tor Vergata", Rome 00133, Italy
| | - P Di Nardo
- Laboratory of Molecular and Cellular Cardiology, Department of Internal Medicine, University of Rome "Tor Vergata", Rome 00133, Italy
| | - E Traversa
- International Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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27
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Stroppa DG, Dalmaschio CJ, Houben L, Barthel J, Montoro LA, Leite ER, Ramirez AJ. Analysis of Dopant Atom Distribution and Quantification of Oxygen Vacancies on Individual Gd‐Doped CeO
2
Nanocrystals. Chemistry 2014; 20:6288-93. [DOI: 10.1002/chem.201400412] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Daniel G. Stroppa
- Ernst Ruska‐Centre, Forschungszentrum Jülich, 52425 Jülich (Germany)
- Brazilian Nanotechnology National Laboratory, 13083‐970, Campinas, SP (Brazil)
- Current position: International Iberian Nanotechnology Laboratory (INL), Braga (Portugal)
| | - Cleocir J. Dalmaschio
- Department of Chemistry, Federal University of São Carlos, 13565‐905, São Carlos (Brazil)
- Current position: Universidade Federal do Espírito Santo (UFES), São Mateus (Brazil)
| | - Lothar Houben
- Ernst Ruska‐Centre, Forschungszentrum Jülich, 52425 Jülich (Germany)
| | - Juri Barthel
- Ernst Ruska‐Centre, Forschungszentrum Jülich, 52425 Jülich (Germany)
- Central Facility for Electron Microscopy, RWTH Aachen University, 52074 Aachen (Germany)
| | - Luciano A. Montoro
- Brazilian Nanotechnology National Laboratory, 13083‐970, Campinas, SP (Brazil)
| | - Edson R. Leite
- Department of Chemistry, Federal University of São Carlos, 13565‐905, São Carlos (Brazil)
| | - Antonio J. Ramirez
- Brazilian Nanotechnology National Laboratory, 13083‐970, Campinas, SP (Brazil)
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28
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Fang J, Shi F, Bao H, Qian K, Jiang Z, Huang W. Evolution of surface and bulk structures of CexTi1-xO2 oxide composites. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.1016/s1872-2067(12)60667-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Batuk ON, Szabó DV, Denecke MA, Vitova T, Kalmykov SN. Synthesis and characterization of thorium, uranium and cerium oxide nanoparticles. RADIOCHIM ACTA 2013. [DOI: 10.1524/ract.2012.2014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
We describe the synthesis of cerium, thorium and uranium oxide nanoparticles embedded in a mesoporous matrix as template in a kind of nanocasting technique. The solid matrix is used as a template to obtain and stabilize the actinide oxide nanoparticles. We apply high resolution transmission electron microscopy (HR-TEM) to show evidence of metal oxide incorporation into the matrix pores and analyze their structure. Measured interplanar distances and calculated lattice parameters for synthesized nanosized CeO2−x
and ThO2 samples differ from their bulk crystalline counterparts. We obtain with our synthesis CeO2−x
particles containing both Ce4+ and larger sized Ce3+. The lattice parameter for these ceria nanoparticles is found to be larger than the bulk value due to the presence of Ce3+ with its larger ionic radius. The presence of Ce3+ was established by means of high resolution X-ray emission spectroscopy (HRXES), applied to the investigation of nanoparticles for the first time. The ThO2 nanoparticles exhibit a decrease in interplanar distances, as one might generally expected for these nanoclusters. However, the lattice distance decrease for our particles is remarkable, up to 5%, indicating that contact with the surrounding silica matrix may exert a bond distance shortening effect such as through significant external pressure on the particle surface.
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31
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Vigier JF, Renard C, Henry N, Laplace A, Abraham F. Molten salt synthesis of a mixed-valent lanthanide(III/IV) oxychloride with an unprecedented Sillen X(2)(4) structure: Ce1.3Nd0.7O3Cl. Inorg Chem 2012; 51:4352-8. [PMID: 22428870 DOI: 10.1021/ic3000558] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new cerium neodymium oxychloride, Ce1.3Nd0.7O3Cl, has been synthesized by precipitation in a LiCl–CaCl2 molten salt by humid argon sparging. Chemical and structure characterization have been undertaken by powder X-ray diffraction, scanning electron microscopy, high-temperature X-ray diffraction, thermogravimetric analysis, and X-ray photoelectron scattering. This oxychloride crystallizes in space group P4/nmm, a = 3.9848(3) Å and c = 12.467(2) Å, in a new Sillen-type phase represented by the symbol X(2)(4) where “quadruple” fluorite-type layers [M4O6], containing Ce(IV) in “inner” sublayers and both CeIII and NdIII in “outer” sublayers, alternate with double-halide ion sheets. The structure is also described as a stacking of LnOCl and fluorite-type blocks and constitutes the term n = 2 of a possible series (MO2)n(NdOCl)2.
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Affiliation(s)
- Jean-François Vigier
- Unité de Catalyse et de Chimie du Solide, UCCS UMR CNRS 8181, ENSCL-USTL, Université Lille Nord de France, B.P. 90108, 59652 Villeneuve d'Ascq Cedex, France
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32
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Horlait D, Clavier N, Szenknect S, Dacheux N, Dubois V. Dissolution of cerium(IV)-lanthanide(III) oxides: comparative effect of chemical composition, temperature, and acidity. Inorg Chem 2012; 51:3868-78. [PMID: 22375608 DOI: 10.1021/ic300071c] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dissolution of Ce(1-x)Ln(x)O(2-x/2) solid solutions was undertaken in various acid media in order to evaluate the effects of several physicochemical parameters such as chemical composition, temperature, and acidity on the reaction kinetics. The normalized dissolution rates (R(L,0)) were found to be strongly modified by the trivalent lanthanide incorporation rate, due to the presence of oxygen vacancies decreasing the samples cohesion. Conversely, the nature of the trivalent cation considered only weakly impacted the R(L,0) values. The dependence of the normalized dissolution rates on the temperature then appeared to be of the same order of magnitude than that of chemical composition. Moreover, it allowed determining the corresponding activation energy (E(A) ≈ 60-85 kJ·mol(-1)) which accounts for a dissolution driven by surface-controlled reactions. A similar conclusion was made regarding the acidity of the solution: the partial order related to (H(3)O(+)) reaching about 0.7. Finally, the prevailing effect of the incorporation of aliovalent cations in the fluorite-type CeO(2) matrix on the dissolution kinetics precluded the observation of slight effects such as those linked to the complexing agents or to the crystal structure of the samples.
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Affiliation(s)
- D Horlait
- ICSM, UMR 5257 CEA/CNRS/UM2/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols/Cèze, Cedex, France
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Horlait D, Claparède L, Clavier N, Szenknect S, Dacheux N, Ravaux J, Podor R. Stability and Structural Evolution of CeIV1–xLnIIIxO2–x/2Solid Solutions: A Coupled μ-Raman/XRD Approach. Inorg Chem 2011; 50:7150-61. [DOI: 10.1021/ic200751m] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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34
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Azalim S, Franco M, Brahmi R, Giraudon JM, Lamonier JF. Removal of oxygenated volatile organic compounds by catalytic oxidation over Zr-Ce-Mn catalysts. JOURNAL OF HAZARDOUS MATERIALS 2011; 188:422-427. [PMID: 21354699 DOI: 10.1016/j.jhazmat.2011.01.135] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 12/28/2010] [Accepted: 01/31/2011] [Indexed: 05/30/2023]
Abstract
The composition-activity relationship of Zr-Ce-Mn-O materials was investigated for the catalytic removal of Oxygenated Volatile Organic Compounds (OVOC) emitted by stationary sources. Using a sol-gel method, very high surface specific areas, small crystallite sizes and high redox properties were obtained for Zr(0.4)Ce(0.6-x)Mn(x)O(2) catalytic systems after calcination at 500°C. The textural and redox properties were improved when Mn content increased in the material, especially for x=0.36. As a result the most active and selective catalyst in the butanol (model of OVOC) oxidation was obtained for the nominal composition Zr(0.4)Ce(0.24)Mn(0.36)O(2) due to a high oxygen mobility and surface Mn(4+) concentration.
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Affiliation(s)
- Saïd Azalim
- Univ Lille Nord de France, USTL, Unité de Catalyse et de Chimie du Solide, UMR CNRS 8181, 59652 Villeneuve d'Ascq, France
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35
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Gao P, Kang Z, Fu W, Wang W, Bai X, Wang E. Electrically Driven Redox Process in Cerium Oxides. J Am Chem Soc 2010; 132:4197-201. [DOI: 10.1021/ja9086616] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peng Gao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
| | - Zhenchuan Kang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
| | - Wangyang Fu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
| | - Wenlong Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
| | - Xuedong Bai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
| | - Enge Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, RE-POWER TECH, 8211 E. Garfield Street, Scottsdale, Arizona 85257, and School of Physics, Peking University, Beijing 100871, China
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Preparation and characterization of nanocrystallines Mn-Ce-Zr mixed oxide catalysts by sol-gel method: application to the complete oxidation of n-butanol. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/s0167-2991(10)75147-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Kockrick E, Schrage C, Grigas A, Geiger D, Kaskel S. Synthesis and catalytic properties of microemulsion-derived cerium oxide nanoparticles. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2008.04.036] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Opalka SM, Vanderspurt TH, Radhakrishnan R, She Y, Willigan RR. Design of water gas shift catalysts for hydrogen production in fuel processors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:064237. [PMID: 21693898 DOI: 10.1088/0953-8984/20/6/064237] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Low sulfur hydrocarbon fuels can be converted to fuel cell grade H(2) using a compact fuel processor architecture. The necessary high volumetric activity water gas shift (WGS) Pt on ceria-zirconia catalysts reacts CO-rich reformate with steam to yield H(2) and CO(2). Such highly selective, non-pyrophoric noble metal/Ce([1-(x+y)])Zr(x)Dp(y)O(2) catalysts were developed through coordinated atomic modeling, syntheses, structural characterization, kinetic performance tests, and micro-kinetic analyses. Density functional simulations made with the VASP code suggested that the undoped catalyst WGS activity would be limited by the strong binding of CO intermediates, blocking the reoxidation of the reduced oxide by water. These predictions were confirmed by in situ cylindrical internal reflection-Fourier transform infrared spectroscopy and by micro-kinetic analyses of the micro-reactor results. Atomic simulations were used to evaluate the impact transition metal dopants had on the surface chemistry of cubic ceria-zirconia. VASP predicted that acidic transition metal dopants such as Nb, Mo, Ta, and W would increase the oxide surface affinity for water and thus increase the turnover rate of the catalyst. The efficacy of Mo-doped ceria-zirconia compositions was confirmed at lower temperatures in replicated catalyst synthesis-reactor studies.
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Affiliation(s)
- S M Opalka
- United Technologies Research Center, East Hartford, CT 06108, USA
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Krivovichev SV, Filatov SK, Semenova TF. Types of cationic complexes based on oxocentred tetrahedra [OM4] in the crystal structures of inorganic compounds. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc1998v067n02abeh000287] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Charkin DO, Zolotova XN. A crystallographic re-investigation of Cu2Sb-related binary, ternary, and quaternary structures: how many structure types can exist upon the same topology of a unit cell? CRYSTALLOGR REV 2007. [DOI: 10.1080/08893110701618993] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bernal S, Calvino J, Cauqui M, Gatica J, Larese C, Pérez Omil J, Pintado J. Some recent results on metal/support interaction effects in NM/CeO2 (NM: noble metal) catalysts. Catal Today 1999. [DOI: 10.1016/s0920-5861(98)00503-3] [Citation(s) in RCA: 369] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Spreading and Phase Transformations in Highly Dispersed CeO2/SiO2and Pd/CeO2/SiO2Systems. J SOLID STATE CHEM 1997. [DOI: 10.1006/jssc.1997.7364] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Kepiński L, Wołcyrz M, Okal J. Effect of chlorine on microstructure and activity of Pd/CeO2catalysts. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/ft9959100507] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cunningham J, Cullinane D, Farrell F, O'Driscoll JP, Morris MA. Microstructural and oxygen-handling characteristics of CeO2with M3+promoters. Part 1.—Characterization of calcined powders by XRD and oxygen-isotope exchange. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/jm9950501027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Influence of the nature of the metal precursor salt on the redox behaviour of ceria in Rh/CeO2 catalysts. CATALYSIS AND AUTOMOTIVE POLLUTION CONTROL III, PROCEEDINGS OF THE THIRD INTERNATIONAL SYMPOSIUM CAPOC 3 1995. [DOI: 10.1016/s0167-2991(06)81448-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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