1
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Holm A, Davies B, Boscolo Bibi S, Moncada F, Halldin-Stenlid J, Paškevičius L, Claman V, Slabon A, Tai CW, Campos dos-Santos E, Koroidov S. A Water-Promoted Mars-van Krevelen Reaction Dominates Low-Temperature CO Oxidation over Au-Fe 2O 3 but Not over Au-TiO 2. ACS Catal 2024; 14:3191-3197. [PMID: 38449533 PMCID: PMC10913026 DOI: 10.1021/acscatal.3c05978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 03/08/2024]
Abstract
We provide experimental evidence that is inconsistent with often proposed Langmuir-Hinshelwood (LH) mechanistic hypotheses for water-promoted CO oxidation over Au-Fe2O3. Passing CO and H2O, but no O2, over Au-γ-Fe2O3 at 25 °C, we observe significant CO2 production, inconsistent with LH mechanistic hypotheses. Experiments with H218O further show that previous LH mechanistic proposals cannot account for water-promoted CO oxidation over Au-γ-Fe2O3. Guided by density functional theory, we instead postulate a water-promoted Mars-van Krevelen (w-MvK) reaction. Our proposed w-MvK mechanism is consistent both with observed CO2 production in the absence of O2 and with CO oxidation in the presence of H218O and 16O2. In contrast, for Au-TiO2, our data is consistent with previous LH mechanistic hypotheses.
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Affiliation(s)
- Alexander Holm
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
- Department
of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114
18 Stockholm, Sweden
- Laboratory
of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-60174 Sweden
| | - Bernadette Davies
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
- Department
of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114
18 Stockholm, Sweden
| | - Sara Boscolo Bibi
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
| | - Felix Moncada
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
| | - Joakim Halldin-Stenlid
- KBR,
Inc., Intelligent Systems Division, NASA
Ames Research Center, Moffett
Field, California 94035, United States
| | - Laurynas Paškevičius
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
| | - Vincent Claman
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
| | - Adam Slabon
- Department
of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114
18 Stockholm, Sweden
- Inorganic
Chemistry, University of Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany
| | - Cheuk-Wai Tai
- Department
of Materials and Environmental Chemistry, Stockholm University, Svante Arrhenius väg 16C, 114
18 Stockholm, Sweden
| | - Egon Campos dos-Santos
- Advanced
Institute for Materials Research (WPI-AIMR), Tohoku University, Aoba-ku, Sendai 980-8577, Japan
| | - Sergey Koroidov
- Department
of Physics, AlbaNova University Center, Stockholm University, 106 91 Stockholm, Sweden
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2
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Ma Y, Ge H, Yi S, Yang M, Feng D, Ren Y, Gao J, Qin Y. Understanding the intrinsic synergistic mechanism between Pt—O—Ti interface sites and TiO2 surface sites of Pt/TiO2 catalysts in Fenton-like reaction. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1414-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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3
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CO Oxidation over Alumina-Supported Copper Catalysts. Catalysts 2022. [DOI: 10.3390/catal12091030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
CO oxidation, one of the most important chemical reactions, has been commonly studied in both academia and the industry. It is one good probe reaction in the fields of surface science and heterogeneous catalysis, by which we can gain a better understanding and knowledge of the reaction mechanism. Herein, we studied the oxidation state of the Cu species to seek insight into the role of the copper species in the reaction activity. The catalysts were characterized by XRD, N2 adsorption-desorption, X-ray absorption spectroscopy, and temperature-programmed reduction. The obtained results suggested that adding of Fe into the Cu/Al2O3 catalyst can greatly shift the light-off curve of the CO conversion to a much lower temperature, which means the activity was significantly improved by the Fe promoter. From the transient and temperature-programmed reduction experiments, we conclude that oxygen vacancy plays an important role in influencing CO oxidation activity. Adding Fe into the Cu/Al2O3 catalyst can remove part of the oxygen from the Cu species and form more oxygen vacancy. These oxygen vacancy sites are the main active sites for CO oxidation reaction and follow a Mars-van Krevelen-type reaction mechanism.
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4
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Ren Z, Ruan L, Yin L, Akkiraju K, Giordano L, Liu Z, Li S, Ye Z, Li S, Yang H, Wang Y, Tian H, Liu G, Shao-Horn Y, Han G. Surface Oxygen Vacancies Confined by Ferroelectric Polarization for Tunable CO Oxidation Kinetics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2202072. [PMID: 35580350 DOI: 10.1002/adma.202202072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 05/13/2022] [Indexed: 06/15/2023]
Abstract
Surface oxygen vacancies have been widely discussed to be crucial for tailoring the activity of various chemical reactions from CO, NO, to water oxidation by using oxide-supported catalysts. However, the real role and potential function of surface oxygen vacancies in the reaction remains unclear because of their very short lifetime. Here, it is reported that surface oxygen vacancies can be well confined electrostatically for a polarization screening near the perimeter interface between Pt {111} nanocrystals and the negative polar surface (001) of ferroelectric PbTiO3. Strikingly, such a catalyst demonstrates a tunable catalytic CO oxidation kinetics from 200 °C to near room temperature by increasing the O2 gas pressure, accompanied by the conversion curve from a hysteresis-free loop to one with hysteresis. The combination of reaction kinetics, electronic energy loss spectroscopy (EELS) analysis, and density functional theory (DFT) calculations, indicates that the oxygen vacancies stabilized by the negative polar surface are the active sites for O2 adsorption as a rate-determining step, and then dissociated O moves to the surface of the Pt nanocrystals for oxidizing adsorbed CO. The results open a new pathway for tunable catalytic activity of CO oxidation.
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Affiliation(s)
- Zhaohui Ren
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
- Research Center for Intelligent Sensing, Zhejiang Lab, Hangzhou, 311100, China
| | - Luoyuan Ruan
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
- Research Center for Sensing Materials and Devices, Zhejiang Lab, Hangzhou, 311121, China
| | - Lichang Yin
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Karthik Akkiraju
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Livia Giordano
- Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Zhongran Liu
- Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shi Li
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Zixing Ye
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Songda Li
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Hangsheng Yang
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yong Wang
- Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - He Tian
- Center of Electron Microscopy, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Gang Liu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
| | - Yang Shao-Horn
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Gaorong Han
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
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5
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Wu Y, Xie Z, Gao X, Zhou X, Xu Y, Fan S, Yao S, Li X, Lin L. The Highly Selective Catalytic Hydrogenation of CO2 to CO over Transition Metal Nitrides. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2021.12.022] [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]
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6
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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: 5] [Impact Index Per Article: 1.7] [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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7
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Etim UJ, Bai P, Gazit OM, Zhong Z. Low-Temperature Heterogeneous Oxidation Catalysis and Molecular Oxygen Activation. CATALYSIS REVIEWS 2021. [DOI: 10.1080/01614940.2021.1919044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ubong J. Etim
- Department of Chemical Engineering, Guangdong Technion-Israel Institute of Technology (GTIIT), Shantou, Guangdong, China
| | - Peng Bai
- College of Chemical Engineering, China University of Petroleum, Qingdao, China
| | - Oz M. Gazit
- Wolfson Faculty of Chemical Engineering, Technion – Israel Institute of Technology, Haifa, Israel
| | - Ziyi Zhong
- Department of Chemical Engineering, Guangdong Technion-Israel Institute of Technology (GTIIT), Shantou, Guangdong, China
- Technion Israel Institute of Technology (IIT), Haifa, Israel
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8
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Wang Y, Yang X, Hou C, Yin F, Wang G, Zhu X, Jiang G, Li C. Improved Catalytic Activity and Stability of Ba Substituted SrTiO
3
Perovskite for Oxidative Coupling of Methane. ChemCatChem 2021. [DOI: 10.1002/cctc.202100859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yue Wang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Xiao Yang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Chenxiao Hou
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Fumin Yin
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Guowei Wang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Xiaolin Zhu
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
| | - Guiyuan Jiang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 P. R. China
| | - Chunyi Li
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 P. R. China
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9
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Titanium-doped Boron Nitride Fullerenes as Novel Single-atom Catalysts for CO Oxidation. Catal Letters 2021. [DOI: 10.1007/s10562-021-03762-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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10
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Chen S, Abdel-Mageed AM, Mochizuki C, Ishida T, Murayama T, Rabeah J, Parlinska-Wojtan M, Brückner A, Behm RJ. Controlling the O-Vacancy Formation and Performance of Au/ZnO Catalysts in CO 2 Reduction to Methanol by the ZnO Particle Size. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01415] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shilong Chen
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Ali M. Abdel-Mageed
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Chihiro Mochizuki
- Research Center for Gold Chemistry, Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
| | - Tamao Ishida
- Research Center for Gold Chemistry, Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
| | - Toru Murayama
- Research Center for Gold Chemistry, Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
| | - Jabor Rabeah
- Leibniz Institute for Catalysis (LIKAT Rostock), D-18059 Rostock, Germany
| | | | - Angelika Brückner
- Leibniz Institute for Catalysis (LIKAT Rostock), D-18059 Rostock, Germany
| | - R. Jürgen Behm
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
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11
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Ma H, Gopakumar J, Zhang W, Regli SK, Wang Y, Rout KR, Fuglerud T, Piccinini M, Rønning M, Chen D. Insights of the Dynamic Copper Active Sites in Ethylene Oxychlorination Studied by the Multivariate UV–vis–NIR Resolution Kinetic Approach. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hongfei Ma
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - Jithin Gopakumar
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - Wei Zhang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - Samuel K. Regli
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - Yalan Wang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - Kumar R. Rout
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
- Sintef Industry, Sem sælands vei 2A, 7491 Trondheim, Norway
| | | | | | - Magnus Rønning
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Sem sælands vei 4, 7491 Trondheim, Norway
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12
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Peng Y, Shang C, Liu ZP. The dome of gold nanolized for catalysis. Chem Sci 2021; 12:5664-5671. [PMID: 34168799 PMCID: PMC8179636 DOI: 10.1039/d0sc06502a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 03/06/2021] [Indexed: 12/03/2022] Open
Abstract
Gold is noble in bulk but turns out to be a superior catalyst at the nanoscale when supported on oxides, in particular titania. The critical thickness for activity, namely two-layer gold particles on titania, observed two decades ago represents one of the most influential mysteries in the recent history of heterogeneous catalysis. By developing a Bayesian optimization controlled global potential energy surface exploration tool with machine learning potential, here we determine the atomic structures of gold particles within ∼2 nm on a TiO2 surface. We show that the smallest stable Au nanoparticle is Au24 which is pinned on the oxygen-rich TiO2 and exhibits an unprecedented dome architecture made by a single-layer Au sheet but with an apparent two-atomic-layer height. Importantly, this has the highest activity for CO oxidation at room temperature. The physical origin of the high activity is the outstanding electron storage ability of the nano-dome, which activates the lattice oxygen of the oxide. The determined CO oxidation mechanism, the simulated rate and the fitted apparent energy barrier are consistent with known experimental facts, providing key evidence for the presence of both the high-activity Au dome and the low-activity close-packed Au particles in real catalysts. The future direction for the preparation of active and stable Au-based catalysts is thus outlined.
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Affiliation(s)
- Yao Peng
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University Shanghai 200433 China
| | - Cheng Shang
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University Shanghai 200433 China
| | - Zhi-Pan Liu
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Key Laboratory of Computational Physical Science, Department of Chemistry, Fudan University Shanghai 200433 China
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13
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Li X, Kou Z, Wang J. Manipulating Interfaces of Electrocatalysts Down to Atomic Scales: Fundamentals, Strategies, and Electrocatalytic Applications. SMALL METHODS 2021; 5:e2001010. [PMID: 34927897 DOI: 10.1002/smtd.202001010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/03/2020] [Indexed: 05/03/2023]
Abstract
Raising electrocatalysis by rationally devising catalysts plays a core role in almost all renewable energy conversion and storage systems. The principal catalytic properties can be controlled and improved well by manipulation of interfaces, ascribed to the interactions among different components/players at the interfaces. In particular, manipulating interfaces down to atomic scales is becoming increasingly attractive, not only because those atoms at around the interface are the key players during electrocatalysis, but also, understandings on the atomic level electrocatalysis allow one to gain deep insights into the reaction mechanism. With the feature down-sizing to atomic scales, there is a timely need to redefine the interfaces, as some of them have gone beyond the conventionally perceived interfacial concept. In this overview, the key active players participating in the interfacial manipulation of electrocatalysts are examined, from a new angle of "atomic interface," including those individual atoms, defects, and their interactions, together with the essential characterization techniques for them. The specific approaches and pathways to engineer better atomic interfaces are investigated, and thus to enable the unique electrocatalysis for targeted applications. Looking beyond recent progress, the challenges and prospects of the atomic level interfacial engineering are also briefly visited.
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Affiliation(s)
- Xin Li
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574, Singapore
| | - Zongkui Kou
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574, Singapore
| | - John Wang
- Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574, Singapore
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14
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Three-dimensional (3D) hierarchical Mn2O3 catalysts with the highly efficient purification of benzene combustion. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117633] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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15
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Holm A, Goodman ED, Stenlid JH, Aitbekova A, Zelaya R, Diroll BT, Johnston-Peck AC, Kao KC, Frank CW, Pettersson LGM, Cargnello M. Nanoscale Spatial Distribution of Supported Nanoparticles Controls Activity and Stability in Powder Catalysts for CO Oxidation and Photocatalytic H 2 Evolution. J Am Chem Soc 2020; 142:14481-14494. [PMID: 32786792 PMCID: PMC7924732 DOI: 10.1021/jacs.0c03842] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Supported metal nanoparticles are essential components of high-performing catalysts, and their structures are intensely researched. In comparison, nanoparticle spatial distribution in powder catalysts is conventionally not quantified, and the influence of this collective property on catalyst performance remains poorly investigated. Here, we demonstrate a general colloidal self-assembly method to control uniformity of nanoparticle spatial distribution on common industrial powder supports. We quantify distributions on the nanoscale using image statistics and show that the type of nanospatial distribution determines not only the stability, but also the activity of heterogeneous catalysts. Widely investigated systems (Au-TiO2 for CO oxidation thermocatalysis and Pd-TiO2 for H2 evolution photocatalysis) were used to showcase the universal importance of nanoparticle spatial organization. Spatially and temporally resolved microkinetic modeling revealed that nonuniformly distributed Au nanoparticles suffer from local depletion of surface oxygen, and therefore lower CO oxidation activity, as compared to uniformly distributed nanoparticles. Nanoparticle spatial distribution also determines the stability of Pd-TiO2 photocatalysts, because nonuniformly distributed nanoparticles sinter while uniformly distributed nanoparticles do not. This work introduces new tools to evaluate and understand catalyst collective (ensemble) properties in powder catalysts, which thereby pave the way to more active and stable heterogeneous catalysts.
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Affiliation(s)
- Alexander Holm
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Emmett D. Goodman
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
| | - Joakim Halldin Stenlid
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aisulu Aitbekova
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
| | - Rosadriana Zelaya
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
| | - Benjamin T. Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA
| | - Aaron C. Johnston-Peck
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Kun-Che Kao
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
| | - Curtis W. Frank
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Lars G. M. Pettersson
- Department of Physics, AlbaNova University Center, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Matteo Cargnello
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA
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16
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Chen J, Jiang M, Chen J, Xu W, Jia H. Selective immobilization of single-atom Au on cerium dioxide for low-temperature removal of C1 gaseous contaminants. JOURNAL OF HAZARDOUS MATERIALS 2020; 392:122511. [PMID: 32208320 DOI: 10.1016/j.jhazmat.2020.122511] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 03/05/2020] [Accepted: 03/09/2020] [Indexed: 06/10/2023]
Abstract
Selective immobilization of single-atom Au on the specific facets of CeO2 has been successfully performed by redox etching precipitation (REP), which makes it possible to clearly refine the interfacial effect of multiple-facet support on single atom. With systemic characterizations, it is found that single-atom Au is apt to lie on nonpolar facets of CeO2 (111) and (110) rather than polar facet of CeO2 (100). The modification of morphology-dependent properties is attributed to the different interaction between Au atom and each CeO2 interface. Because of synergy between Au and CeO2, more oxygen vacancies and more active oxygen species are generated; meanwhile, the interfacial effect stabilizes the charged Au species which serves as active site. Therefore, the performance in catalytic oxidation of HCHO and CO on CeO2 is facilitated by loading Au. Among them, CeO2 rod-supported Au as an optimal catalyst exhibits a remarkable activity and stability. With in-situ characterization, the reaction mechanisms for HCHO and CO oxidation over Au/r-CeO2 are studied. Meanwhile, it is proved that REP strategy is also valid to obviously promote catalytic performance whenever commercial CeO2 is used or Au is replaced with Ag, so the improvement of recently applied catalyst with REP process is promising.
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Affiliation(s)
- Jin Chen
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Mingzhu Jiang
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jing Chen
- University of Chinese Academy of Sciences, Beijing, 100049, China; Xiamen Institute of Rare-Earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen, Fujian, 361021, China
| | - Wenjian Xu
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
| | - Hongpeng Jia
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
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17
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Zhu W, Chen X, Jin J, Di X, Liang C, Liu Z. Insight into catalytic properties of Co3O4-CeO2 binary oxides for propane total oxidation. CHINESE JOURNAL OF CATALYSIS 2020. [DOI: 10.1016/s1872-2067(19)63523-0] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Jiang Y, Zhu Y, Zhou D, Jiang Z, Si N, Stacchiola D, Niu T. Reversible oxidation and reduction of gold-supported iron oxide islands at room temperature. J Chem Phys 2020; 152:074710. [PMID: 32087652 DOI: 10.1063/1.5136279] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Monolayer iron oxides grown on metal substrates have widely been used as model systems in heterogeneous catalysis. By means of ambient-pressure scanning tunneling microscopy (AP-STM), we studied the in situ oxidation and reduction of FeO(111) grown on Au(111) by oxygen (O2) and carbon monoxide (CO), respectively. Oxygen dislocation lines present on FeO islands are highly active for O2 dissociation. X-ray photoelectron spectroscopy measurements distinctly reveal the reversible oxidation and reduction of FeO islands after sequential exposure to O2 and CO. Our AP-STM results show that excess O atoms can be further incorporated on dislocation lines and react with CO, whereas the CO is not strong enough to reduce the FeO supported on Au(111) that is essential to retain the activity of oxygen dislocation lines.
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Affiliation(s)
- Yixuan Jiang
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, No. 200, Xiaolingwei 210094, China
| | - Yaguang Zhu
- Center for Functional Nanomaterials, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000, USA
| | - Dechun Zhou
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, No. 200, Xiaolingwei 210094, China
| | - Zhao Jiang
- Department of Chemical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Nan Si
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, No. 200, Xiaolingwei 210094, China
| | - Dario Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-5000, USA
| | - Tianchao Niu
- Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, No. 200, Xiaolingwei 210094, China
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19
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Tang K, Zeng D, Lin F, Yang Y, Wu L. The contributions of distinct Pd surface sites in palladium–ceria catalysts to low-temperature CO oxidation. CrystEngComm 2020. [DOI: 10.1039/c9ce01916b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The low-temperature CO oxidation properties of Pd/CeO2 catalysts can be correlated with the distribution of PdOx/Pd–O–Ce species.
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Affiliation(s)
- Ke Tang
- School of Chemistry and Chemical Engineering
- Heze University
- Heze
- P. R. China
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry
| | - Dan Zeng
- Heze Municipal Hospital
- Heze
- P. R. China
| | - Feng Lin
- School of Chemistry and Chemical Engineering
- Heze University
- Heze
- P. R. China
| | - Yanzhao Yang
- Key Laboratory for Special Functional Aggregate Materials of Education Ministry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- P. R. China
| | - Lishun Wu
- School of Chemistry and Chemical Engineering
- Heze University
- Heze
- P. R. China
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20
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Tran SBT, Choi H, Oh S, Park JY. Defective Nb2O5-supported Pt catalysts for CO oxidation: Promoting catalytic activity via oxygen vacancy engineering. J Catal 2019. [DOI: 10.1016/j.jcat.2019.05.017] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Abdel‐Mageed AM, Klyushin A, Rezvani A, Knop‐Gericke A, Schlögl R, Behm RJ. Ladungszustand von Au‐Nanopartikeln während der Methanolsynthese aus CO
2
/H
2
an Au/ZnO‐Katalysatoren: Einsichten aus Operando IR‐Spektroskopie und In‐situ XPS‐ und XAS‐Messungen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900150] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ali M. Abdel‐Mageed
- Institut für Oberflächenchemie und KatalyseUniversität Ulm 89069 Ulm Deutschland
- Department of ChemistryFaculty of ScienceCairo University Giza 12613 Ägypten
| | - Alexander Klyushin
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
- Max-Planck-Institut für Chemische EnergiewandlungHeterogene Reaktionen Stiftstraße 34–36 45470 Mülheim Deutschland
- Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II Albert-Einstein-Straße 15 12489 Berlin Deutschland
| | - Azita Rezvani
- Institut für Oberflächenchemie und KatalyseUniversität Ulm 89069 Ulm Deutschland
| | - Axel Knop‐Gericke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
- Max-Planck-Institut für Chemische EnergiewandlungHeterogene Reaktionen Stiftstraße 34–36 45470 Mülheim Deutschland
| | - Robert Schlögl
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
- Max-Planck-Institut für Chemische EnergiewandlungHeterogene Reaktionen Stiftstraße 34–36 45470 Mülheim Deutschland
| | - R. Jürgen Behm
- Institut für Oberflächenchemie und KatalyseUniversität Ulm 89069 Ulm Deutschland
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22
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Abdel-Mageed AM, Klyushin A, Rezvani A, Knop-Gericke A, Schlögl R, Behm RJ. Negative Charging of Au Nanoparticles during Methanol Synthesis from CO 2 /H 2 on a Au/ZnO Catalyst: Insights from Operando IR and Near-Ambient-Pressure XPS and XAS Measurements. Angew Chem Int Ed Engl 2019; 58:10325-10329. [PMID: 30980453 DOI: 10.1002/anie.201900150] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Indexed: 11/05/2022]
Abstract
The electronic and structural properties of Au/ZnO under industrial and idealized methanol synthesis conditions have been investigated. This was achieved by kinetic measurements in combination with time-resolved operando infrared (DRIFTS) as well as in situ near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and X-ray absorption near-edge spectroscopy (XANES) measurements at the O K-edge together with high-resolution electron microscopy. The adsorption of CO during the reaction revealed the presence of negatively charged Au nanoparticles/Au sites during the initial phase of the reaction. Near-ambient-pressure XPS and XANES demonstrate the build-up of O vacancies during the reaction, which goes along with a substantial increase in the rate of methanol formation. The results are discussed in comparison with previous findings for Cu/ZnO and Au/ZnO catalysts.
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Affiliation(s)
- Ali M Abdel-Mageed
- Institute of Surface Chemistry and Catalysis, Ulm University, 89069, Ulm, Germany.,Department of Chemistry, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | - Alexander Klyushin
- Fritz-Haber-Institute, Dept. Inorganic Chemistry, Faradayweg 4-6, 14195, Berlin, Germany.,Max Planck Institute for Chemical Energy Conversion, Heterogeneous Reactions, Stiftstrasse 34-36, 45470, Mülheim, Germany.,Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Strasse 15, 12489, Berlin, Germany
| | - Azita Rezvani
- Institute of Surface Chemistry and Catalysis, Ulm University, 89069, Ulm, Germany
| | - Axel Knop-Gericke
- Fritz-Haber-Institute, Dept. Inorganic Chemistry, Faradayweg 4-6, 14195, Berlin, Germany.,Max Planck Institute for Chemical Energy Conversion, Heterogeneous Reactions, Stiftstrasse 34-36, 45470, Mülheim, Germany
| | - Robert Schlögl
- Fritz-Haber-Institute, Dept. Inorganic Chemistry, Faradayweg 4-6, 14195, Berlin, Germany.,Max Planck Institute for Chemical Energy Conversion, Heterogeneous Reactions, Stiftstrasse 34-36, 45470, Mülheim, Germany
| | - R Jürgen Behm
- Institute of Surface Chemistry and Catalysis, Ulm University, 89069, Ulm, Germany
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23
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Chen JJ, Li XN, Chen Q, Liu QY, Jiang LX, He SG. Neutral Au 1-Doped Cluster Catalysts AuTi 2O 3-6 for CO Oxidation by O 2. J Am Chem Soc 2019; 141:2027-2034. [PMID: 30595020 DOI: 10.1021/jacs.8b11118] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Oxide supported gold catalysts (e.g., Au/TiO2) are of great significance in heterogeneous catalysis owing to their extraordinary catalytic activity. Study of heteronuclear metal oxide clusters (HMOCs, e.g., Au xTi yO z q) is an important way to uncover the molecular-level mechanisms of gold catalysis in the related heterogeneous catalytic systems. However, the current studies of HMOCs are focused on charged clusters with little attention paid to neutral species. The reactivity study of neutral HMOCs is vital to have a comprehensive understanding of heterogeneous catalysis, but it is experimentally challenging because of the difficulty of cluster ionization and detection without fragmentation. Herein, benefiting from a homemade time-of-flight mass spectrometer coupled with a vacuum ultraviolet laser system, the reactivity of neutral Au1-doped titanium oxide clusters AuTi2O3-6 in catalytic CO oxidation by O2 has been successfully identified. The mechanistic details of the catalysis have been elucidated by quantum chemistry calculations. The crucial roles of the mobile AuCO species that can facilitate not only the process of CO oxidation but also the process of O2 activation have been discovered in the cluster catalysis. The fascinating results are of substantial importance to understand the mechanisms of CO oxidation over Au/TiO2, one type of the best studied gold catalysts.
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Affiliation(s)
- Jiao-Jiao Chen
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
| | - Xiao-Na Li
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
| | - Qiang Chen
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
| | - Qing-Yu Liu
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
| | - Li-Xue Jiang
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
| | - Sheng-Gui He
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China.,Beijing National Laboratory for Molecular Sciences , CAS Research/Education Center of Excellence in Molecular Sciences , Beijing 100190 , China
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24
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Du X, Han W, Tang Z, Zhang J. Controlled synthesis of Pd/CoOx–InOx nanofibers for low-temperature CO oxidation reaction. NEW J CHEM 2019. [DOI: 10.1039/c9nj03055g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Herein, we report a series of Pd/CoOx–InOx nanofibers with different morphologies (such as nanofibers, porous nanofibers and bead-like nanofibers) via electrospinning, annealing and impregnation methods.
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Affiliation(s)
- Xuebi Du
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Weiliang Han
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Zhicheng Tang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, and National Engineering Research Center for Fine Petrochemical Intermediates
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- P. R. China
| | - Jiyi Zhang
- School of Petroleum and Chemical
- Lanzhou University of Technology
- Lanzhou 730050
- P. R. China
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25
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A Rational Design of the Sintering-Resistant Au-CeO₂ Nanoparticles Catalysts for CO Oxidation: The Influence of H₂ Pretreatments. MATERIALS 2018; 11:ma11101952. [PMID: 30321989 PMCID: PMC6213528 DOI: 10.3390/ma11101952] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 09/27/2018] [Accepted: 10/02/2018] [Indexed: 11/25/2022]
Abstract
The redox pretreatment of samples is one of the crucial ways of altering the catalytic properties of the supported noble metal materials in many heterogeneous reactions. Here, H2-reducing pretreatment is reported to enhance the thermal stability of Au-CeO2 catalysts prepared by the deposition–precipitation method and calcination at 600 °C for CO oxidation. In order to understand the improved activity and thermal stability, a series of techniques were used to characterize the physico-chemical changes of the catalyst samples. H2 pretreatment may lead to: (i) a strong metal–support interaction (SMSI) between Au nanoparticles (NPs) and CeO2, evidenced by the particular coverage of Au NPs by CeO2, electronic interactions and CO adsorption changes. (ii) the production of surface bicarbonates which can accelerate CO oxidation. As a result, the H2 pretreatment makes the Au NPs more resistant to sintering at high temperature and enhances the CO oxidation activity. Furthermore, this reduction pretreatment strategy may provide a potential approach to enhance the thermal-stability of other supported noble metal catalysts.
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26
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Schlexer P, Widmann D, Behm RJ, Pacchioni G. CO Oxidation on a Au/TiO2 Nanoparticle Catalyst via the Au-Assisted Mars–van Krevelen Mechanism. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01751] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Philomena Schlexer
- Dipartimento di Scienza dei Materiali, Universitá Milano-Bicocca, Milan I-20125, Italy
| | - Daniel Widmann
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - R. Jürgen Behm
- Institute of Surface Chemistry and Catalysis, Ulm University, D-89069 Ulm, Germany
| | - Gianfranco Pacchioni
- Dipartimento di Scienza dei Materiali, Universitá Milano-Bicocca, Milan I-20125, Italy
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27
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Chen J, Yan D, Xu Z, Chen X, Chen X, Xu W, Jia H, Chen J. A Novel Redox Precipitation to Synthesize Au-Doped α-MnO 2 with High Dispersion toward Low-Temperature Oxidation of Formaldehyde. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:4728-4737. [PMID: 29589742 DOI: 10.1021/acs.est.7b06039] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A novel method of redox precipitation was applied for the first time to synthesize a Au-doped α-MnO2 catalyst with high dispersion of the Au species. Au nanoparticles (NPs) can be downsized into approximate single atoms by this method, thereby realizing highly efficient utilization of Au element as well as satisfying low-temperature oxidation of formaldehyde (HCHO). Under catalysis of the optimal 0.25% Au/α-MnO2 catalyst, a polluted stream containing 500 ppm HCHO can be completely cleaned at 75 °C with the condition of a weight hourly space velocity (WHSV) of 60000 mL/(g h). Meanwhile, the catalyst retains good activity for removal of low-concentration HCHO (about 1 ppm) at ambient temperature with a high WHSV, and exhibits a high tolerance to water and long-term stability. Our characterization of Au/α-MnO2 and catalytic performance tests clearly demonstrate that the proper amount of Au doping facilitates formation of surface vacancy oxygen, lattice oxygen, and charged Au species as an active site, which are all beneficial to catalytic oxidation of HCHO. The oxidation of HCHO over Au-doped α-MnO2 catalyst obeys the Mars-van Krevelen mechanism as evidenced by in situ diffuse reflectance infrared Fourier transform spectroscopy.
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Affiliation(s)
- Jin Chen
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
| | - Dongxu Yan
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
- University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Zhen Xu
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
| | - Xi Chen
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
- University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Xi Chen
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
- University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Wenjian Xu
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
| | - Hongpeng Jia
- CAS Center for Excellence in Regional Atmospheric Environment, and Key Laboratory of Urban Pollutant Conversion , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , 361021 , China
- University of Chinese Academy of Sciences , Beijing , 100049 , China
| | - Jing Chen
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , China
- Xiamen Institute of Rare-Earth Materials, Haixi Institutes , Chinese Academy of Sciences , Xiamen , 361021 , China
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