1
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Chen L, Allec SI, Nguyen MT, Kovarik L, Hoffman AS, Hong J, Meira D, Shi H, Bare SR, Glezakou VA, Rousseau R, Szanyi J. Dynamic Evolution of Palladium Single Atoms on Anatase Titania Support Determines the Reverse Water-Gas Shift Activity. J Am Chem Soc 2023; 145:10847-10860. [PMID: 37145876 DOI: 10.1021/jacs.3c02326] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Research interest in single-atom catalysts (SACs) has been continuously increasing. However, the lack of understanding of the dynamic behaviors of SACs during applications hinders catalyst development and mechanistic understanding. Herein, we report on the evolution of active sites over Pd/TiO2-anatase SAC (Pd1/TiO2) in the reverse water-gas shift (rWGS) reaction. Combining kinetics, in situ characterization, and theory, we show that at T ≥ 350 °C, the reduction of TiO2 by H2 alters the coordination environment of Pd, creating Pd sites with partially cleaved Pd-O interfacial bonds and a unique electronic structure that exhibit high intrinsic rWGS activity through the carboxyl pathway. The activation by H2 is accompanied by the partial sintering of single Pd atoms (Pd1) into disordered, flat, ∼1 nm diameter clusters (Pdn). The highly active Pd sites in the new coordination environment under H2 are eliminated by oxidation, which, when performed at a high temperature, also redisperses Pdn and facilitates the reduction of TiO2. In contrast, Pd1 sinters into crystalline, ∼5 nm particles (PdNP) during CO treatment, deactivating Pd1/TiO2. During the rWGS reaction, the two Pd evolution pathways coexist. The activation by H2 dominates, leading to the increasing rate with time-on-stream, and steady-state Pd active sites similar to the ones formed under H2. This work demonstrates how the coordination environment and nuclearity of metal sites on a SAC evolve during catalysis and pretreatments and how their activity is modulated by these behaviors. These insights on SAC dynamics and the structure-function relationship are valuable to mechanistic understanding and catalyst design.
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Affiliation(s)
- Linxiao Chen
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Sarah I Allec
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Manh-Thuong Nguyen
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Libor Kovarik
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Adam S Hoffman
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Jiyun Hong
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Debora Meira
- Canadian Light Source Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Honghong Shi
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Simon R Bare
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | | | - Roger Rousseau
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - János Szanyi
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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2
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Xie Z, Guo H, Huang E, Mao Z, Chen X, Liu P, Chen JG. Catalytic Tandem CO 2–Ethane Reactions and Hydroformylation for C3 Oxygenate Production. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01700] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhenhua Xie
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Haoyue Guo
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Erwei Huang
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Zhongtian Mao
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Xiaobo Chen
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Ping Liu
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Jingguang G. Chen
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
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3
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Li J, Yue MF, Wei YM, Li JF. Synthetic strategies of single-atoms catalysts and applications in electrocatalysis. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.139835] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Xie Z, Wang X, Chen X, Liu P, Chen JG. General Descriptors for CO 2-Assisted Selective C-H/C-C Bond Scission in Ethane. J Am Chem Soc 2022; 144:4186-4195. [PMID: 35133131 DOI: 10.1021/jacs.1c13415] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The selective C-H/C-C bond scission in CO2-assisted alkane activation represents an opportunity for simultaneously upgrading greenhouse gas CO2 and light alkanes for the synthesis of value-added syngas (CO and H2), olefins, aromatics, and oxygenates. Here, Pd bimetallic (PdMx)-derived catalysts were investigated for ethane-CO2 reactions by combining kinetic analysis, in situ characterization, and density functional theory calculations. Two types of catalyst structures were identified under the reaction conditions, with the PdCox alloy surface favoring ethoxy formation, a critical precursor for further C-C bond scission, and the reaction-induced InOx/Pd interface promoting C-H bond scission. Our results revealed a general strategy to capture the reaction-induced surface configurations and in turn control the selectivity in C-C/C-H bond scission over PdMx-derived catalysts, featuring the interplay of two general descriptors: formation energy of PdMx surfaces and their binding energy to oxygen. Our study provides insight into the rational design of selective catalysts for light alkane-CO2 reactions.
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Affiliation(s)
- Zhenhua Xie
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States.,Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Xuelong Wang
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Xiaobo Chen
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902, United States
| | - Ping Liu
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Jingguang G Chen
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States.,Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
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5
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Li Y, Kottwitz M, Vincent JL, Enright MJ, Liu Z, Zhang L, Huang J, Senanayake SD, Yang WCD, Crozier PA, Nuzzo RG, Frenkel AI. Dynamic structure of active sites in ceria-supported Pt catalysts for the water gas shift reaction. Nat Commun 2021; 12:914. [PMID: 33568629 PMCID: PMC7876036 DOI: 10.1038/s41467-021-21132-4] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 01/02/2021] [Indexed: 11/09/2022] Open
Abstract
Oxide-supported noble metal catalysts have been extensively studied for decades for the water gas shift (WGS) reaction, a catalytic transformation central to a host of large volume processes that variously utilize or produce hydrogen. There remains considerable uncertainty as to how the specific features of the active metal-support interfacial bonding—perhaps most importantly the temporal dynamic changes occurring therein—serve to enable high activity and selectivity. Here we report the dynamic characteristics of a Pt/CeO2 system at the atomic level for the WGS reaction and specifically reveal the synergistic effects of metal-support bonding at the perimeter region. We find that the perimeter Pt0 − O vacancy−Ce3+ sites are formed in the active structure, transformed at working temperatures and their appearance regulates the adsorbate behaviors. We find that the dynamic nature of this site is a key mechanistic step for the WGS reaction. Revealing the structure and dynamics of active sites is essential to understand catalytic mechanisms. Here the authors demonstrate the dynamic nature of perimeter Pt0−O vacancy−Ce3+ sites in Pt/CeO2 and the key effects of their dynamics on the mechanism of the water gas shift reaction.
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Affiliation(s)
- Yuanyuan Li
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.
| | - Matthew Kottwitz
- Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA
| | - Joshua L Vincent
- School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287-6106, USA
| | - Michael J Enright
- Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA
| | - Zongyuan Liu
- Chemistry Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Lihua Zhang
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Jiahao Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA
| | | | - Wei-Chang D Yang
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.,Institute for Research in Electronics and Applied Physics & Maryland NanoCenter, University of Maryland, College Park, MD, 20742, USA
| | - Peter A Crozier
- School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287-6106, USA
| | - Ralph G Nuzzo
- Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA.,Surface and Corrosion Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinasväg 51, 100 44, Stockholm, Sweden
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.,Chemistry Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
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6
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Chen L, Ali IS, Sterbinsky GE, Zhou X, Wasim E, Tait SL. Ligand-coordinated Ir single-atom catalysts stabilized on oxide supports for ethylene hydrogenation and their evolution under a reductive atmosphere. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01132k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effective, stable, durable, and tunable Ir-ligand single-atom catalysts for ethylene hydrogenation, studied in situ for structural evolution of Ir single-atoms under a reducing atmosphere.
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Affiliation(s)
- Linxiao Chen
- Dept. of Chemistry
- Indiana University
- Indiana 47405
- USA
| | - Iyad S. Ali
- Dept. of Chemistry
- Indiana University
- Indiana 47405
- USA
| | | | - Xuemei Zhou
- Dept. of Chemistry
- Indiana University
- Indiana 47405
- USA
| | - Eman Wasim
- Dept. of Chemistry
- Indiana University
- Indiana 47405
- USA
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7
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Wang Y, Su H, He Y, Li L, Zhu S, Shen H, Xie P, Fu X, Zhou G, Feng C, Zhao D, Xiao F, Zhu X, Zeng Y, Shao M, Chen S, Wu G, Zeng J, Wang C. Advanced Electrocatalysts with Single-Metal-Atom Active Sites. Chem Rev 2020; 120:12217-12314. [DOI: 10.1021/acs.chemrev.0c00594] [Citation(s) in RCA: 292] [Impact Index Per Article: 73.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yuxuan Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Hongyang Su
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Yanghua He
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Ligui Li
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510007, China
| | - Shangqian Zhu
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong P. R. China
| | - Hao Shen
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Pengfei Xie
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Xianbiao Fu
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Guangye Zhou
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Chen Feng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Dengke Zhao
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510007, China
| | - Fei Xiao
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong P. R. China
| | - Xiaojing Zhu
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510007, China
| | - Yachao Zeng
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Minhua Shao
- Department of Chemical and Biological Engineering, Energy Institute, Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory, and Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, The Hong Kong University of Science and Technology, Kowloon, Hong Kong P. R. China
| | - Shaowei Chen
- Department of Chemistry and Biochemistry, University of California, 1156 High Street, Santa Cruz, California 95064, United States
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Jie Zeng
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Chao Wang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
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8
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Biswas S, Pal A, Pal T. Supported metal and metal oxide particles with proximity effect for catalysis. RSC Adv 2020; 10:35449-35472. [PMID: 35515660 PMCID: PMC9056907 DOI: 10.1039/d0ra06168a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/08/2020] [Indexed: 11/21/2022] Open
Abstract
External influence is essential for any change to occur in this world. Similarly, the reaction path of a chemical reaction can be changed with the addition of a catalyst from outside. Sometimes a catalyst performs better when it remains associated with an inert substance, which is called a support material (SM). Improved catalyst accomplishment arises from the 'proximity effect'. Even inert supports play a role in better product formulation or environmental remediation. In this review, it has been shown how the SM, as a nest, aids the catalyst particle synergistically to perform a good job in a chemical reaction. The structure-function relationship of SM helps in catalyst activation to some extent, and produces active centres that are difficult to fully ascertain. In the text, Langmuir-Hinshelwood (L-H), Mars-van Krevelen (MVK), and Eley-Rideal (E-R) mechanisms are highlighted for the adsorption processes as the case may be. Again, the importance of SM for both catalyst and substrates has been consolidated here in the text. Finally, the role of the initiator and the promoter is also discussed in this review.
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Affiliation(s)
- Subhadeep Biswas
- Department of Civil Engineering, Indian Institute of Technology Kharagpur 721302 India
| | - Anjali Pal
- Department of Civil Engineering, Indian Institute of Technology Kharagpur 721302 India
| | - Tarasankar Pal
- Department of Chemical Sciences, University of Johannesburg Auckland Park South Africa
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9
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Cooper C, Dooley KM, Fierro-Gonzalez JC, Guzman J, Jentoft R, Lamb HH, Ogino I, Runnebaum RC, Sapre A, Uzun A. Bruce Gates: A Career in Catalysis. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03568] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cawas Cooper
- Codexis Inc., 200 Penobscot Drive, Redwood City, California 94063, United States
| | - Kerry M. Dooley
- Department of Chemical Engineering, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Juan C. Fierro-Gonzalez
- Departamento de Ingenieria Quimica, Tecnologico Nacional de Mexico en Celaya, Av. Tecnologico y Antonio Garcia Cubas s/n, Celaya, Guanajuato 38010, Mexico
| | - Javier Guzman
- ExxonMobil Research and Engineering Co., 22777 Springwood Village Parkway, Spring, Texas 77389, United States
| | - Rolf Jentoft
- Department of Chemical Engineering, University of Massachusetts, 154D Goessmann Laboratory, Amherst, Massachusetts 01003-9303, United States
| | - H. Henry Lamb
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Isao Ogino
- Faculty of Engineering, Hokkaido University, N13W8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan
| | - Ron C. Runnebaum
- Department of Chemical Engineering and Department of Viticulture & Enology, University of California−Davis, One Shields Ave., Davis, California 95616, United States
| | - Ajit Sapre
- Reliance Industries Ltd., Ghansoli, Navi Mumbai, 400701, Mumbai, Maharashtra India
| | - Alper Uzun
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, 34450, Istanbul, Turkey
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10
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Perez-Aguilar JE, Chen CY, Hughes JT, Fang CY, Gates BC. Isostructural Atomically Dispersed Rhodium Catalysts Supported on SAPO-37 and on HY Zeolite. J Am Chem Soc 2020; 142:11474-11485. [DOI: 10.1021/jacs.0c03730] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jorge E. Perez-Aguilar
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Cong-Yan Chen
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
- Chevron Energy Technology Company, Richmond, California 94802, United States
| | - James T. Hughes
- Zeolyst International, Conshohocken, Pennsylvania 19428, United States
| | - Chia-Yu Fang
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California, Davis, California 95616, United States
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11
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Resasco J, DeRita L, Dai S, Chada JP, Xu M, Yan X, Finzel J, Hanukovich S, Hoffman AS, Graham GW, Bare SR, Pan X, Christopher P. Uniformity Is Key in Defining Structure–Function Relationships for Atomically Dispersed Metal Catalysts: The Case of Pt/CeO2. J Am Chem Soc 2019; 142:169-184. [DOI: 10.1021/jacs.9b09156] [Citation(s) in RCA: 115] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Joaquin Resasco
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Leo DeRita
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | | | - Joseph P. Chada
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Mingjie Xu
- Fok Ying Tung Research Institute, Hong Kong University of Science and Technology, Guangzhou 511458, PR China
| | | | - Jordan Finzel
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Sergei Hanukovich
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Adam S. Hoffman
- Stanford Synchrotron Radiation Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - George W. Graham
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Simon R. Bare
- Stanford Synchrotron Radiation Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | | | - Phillip Christopher
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
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12
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Babucci M, Sarac Oztuna FE, Debefve LM, Boubnov A, Bare SR, Gates BC, Unal U, Uzun A. Atomically Dispersed Reduced Graphene Aerogel-Supported Iridium Catalyst with an Iridium Loading of 14.8 wt %. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02231] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Melike Babucci
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - F. Eylul Sarac Oztuna
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - Louise M. Debefve
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Alexey Boubnov
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Simon R. Bare
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Ugur Unal
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - Alper Uzun
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
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13
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Wang X, Beine AK, Hausoul PJC, Palkovits R. Cu/C‐catalyzed Hydrogenolysis of Sorbitol to Glycols–On the Influence of Particle Size and Base. ChemCatChem 2019. [DOI: 10.1002/cctc.201900299] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xinde Wang
- Institut für Technische und Makromolekulare ChemieRWTH Aachen University Worringerweg 2 52074 Aachen Germany
| | - Anna Katharina Beine
- Institut für Technische und Makromolekulare ChemieRWTH Aachen University Worringerweg 2 52074 Aachen Germany
| | - Peter J. C. Hausoul
- Institut für Technische und Makromolekulare ChemieRWTH Aachen University Worringerweg 2 52074 Aachen Germany
| | - Regina Palkovits
- Institut für Technische und Makromolekulare ChemieRWTH Aachen University Worringerweg 2 52074 Aachen Germany
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14
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Oxychlorination Redispersion of Pt Catalysts: Surface Species and Pt-support Interactions Characterized by X-Ray Absorption and FT-IR Spectroscopy. Catalysts 2019. [DOI: 10.3390/catal9040362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
To help elucidate the oxychlorination redispersion reaction mechanism, the surface species formed on the surface of -Al2O3 was characterized by X-ray absorption spectroscopy (XAS). The efficacy of redispersion was assessed by the Pt–Pt coordination number (CNPt–Pt) of redispersed, and then reduced samples. A nearly fully redispersed complex (Ptrd52) was prepared by treating a sintered model Pt/-Al2O3 catalyst at 520 °C, Air/EDC (ethylene dichloride) of 30, and WHSV (Weight Hourly Space Velocity) of 0.07 h−1 for 16 h. For investigating temperature effects, samples treated at 460 (Ptrd46) and 560 C (Ptrd56) were also prepared for comparison. It was found that, while an octahedral resembling Pt(Os)3–4(O–Cl)2–3 (Os represents support oxygen or hydroxyl oxygen) complex was formed on -Al2O3 of Ptrd52, less O–Cl ligands were formed on the redispersed complexes, Ptrd46 and Ptrd56. A negative correlation of CNPt–Pt with CNPt–Cl* (Cl* represents the Cl atom in O–Cl ligand) for these three samples further suggested that the formation of Pt–O–Cl played a key role in the redispersion process. Pt–O–Cl could be formed in the reaction of reactive Cl and PtO2. At an operation temperature of lower-than-optimal temperatures of 520 C, less Cl2 dissociation and less O–Cl ligands were formed. On the other hand, higher temperatures may facilitate Cl2 dissociation, but reduce the equilibrium conversion of HCl to Cl2, leading to increased HCl reaction with Pt (PtO2) clusters to form Pt–Cl (Cl is the atom bonded directly to Pt), and decreased formation of Pt–O–Cl.
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15
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Lin H, Qu H, Chen W, Xu K, Zheng J, Duan X, Zhai H, Yuan Y. Promoted chemoselective crotonaldehyde hydrogenation on zirconia-doped SiO2 supported Ag catalysts: Interfacial catalysis over ternary Ag–ZrO2–SiO2 interfaces. J Catal 2019. [DOI: 10.1016/j.jcat.2019.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Babucci M, Fang CY, Perez-Aguilar JE, Hoffman AS, Boubnov A, Guan E, Bare SR, Gates BC, Uzun A. Controlling catalytic activity and selectivity for partial hydrogenation by tuning the environment around active sites in iridium complexes bonded to supports. Chem Sci 2019; 10:2623-2632. [PMID: 30996978 PMCID: PMC6419936 DOI: 10.1039/c8sc05287e] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 01/08/2019] [Indexed: 01/31/2023] Open
Abstract
Single-site Ir(CO)2 complexes bonded to high-surface-area metal oxide supports, SiO2, TiO2, Fe2O3, CeO2, MgO, and La2O3, were synthesized by chemisorption of Ir(CO)2(acac) (acac = acetylacetonate) followed by coating with each of the following ionic liquids (ILs): 1-n-butyl-3-methylimidazolium tetrafluoroborate, [BMIM][BF4], 1-n-butyl-3-methylimidazolium acetate, [BMIM][Ac], and 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide, [CPMIM][DCA]. Extended X-ray absorption fine structure spectroscopy showed that site-isolated iridium was bonded to oxygen atoms of the support. Electron densities on the iridium enveloped by each IL sheath/support combination were characterized by carbonyl infrared spectroscopy of the iridium gem-dicarbonyls and by X-ray absorption near-edge structure data. The electron-donor/acceptor tendencies of both the support and IL determine the activity and selectivity of the catalysts for the hydrogenation of 1,3-butadiene, with electron-rich iridium being selective for partial hydrogenation. The results resolve the effects of the IL and support as ligands; for example, the effect of the IL becomes dominant when the support has a weak electron-donor character. The combined effects of supports and ILs as ligands offer broad opportunities for tuning catalytic properties of supported metal catalysts.
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Affiliation(s)
- Melike Babucci
- Department of Chemical and Biological Engineering , Koç University , Rumelifeneri Yolu , Sariyer 34450, Istanbul , Turkey .
- Koç University TÜPRAŞ Energy Center (KUTEM) , Koç University , Rumelifeneri Yolu , Sariyer 34450, Istanbul , Turkey
| | - Chia-Yu Fang
- Department of Materials Science and Engineering , University of California , Davis , California 95616 , USA
| | - Jorge E Perez-Aguilar
- Department of Chemical Engineering , University of California , Davis , California 95616 , USA .
| | - Adam S Hoffman
- SSRL , SLAC National Accelerator Laboratory , Menlo Park , CA 94025 , USA
| | - Alexey Boubnov
- SSRL , SLAC National Accelerator Laboratory , Menlo Park , CA 94025 , USA
| | - Erjia Guan
- Department of Materials Science and Engineering , University of California , Davis , California 95616 , USA
| | - Simon R Bare
- SSRL , SLAC National Accelerator Laboratory , Menlo Park , CA 94025 , USA
| | - Bruce C Gates
- Department of Chemical Engineering , University of California , Davis , California 95616 , USA .
| | - Alper Uzun
- Department of Chemical and Biological Engineering , Koç University , Rumelifeneri Yolu , Sariyer 34450, Istanbul , Turkey .
- Koç University TÜPRAŞ Energy Center (KUTEM) , Koç University , Rumelifeneri Yolu , Sariyer 34450, Istanbul , Turkey
- Koç University Surface Science and Technology Center (KUYTAM) , Koç University , Rumelifeneri Yolu , Sariyer, 34450 Istanbul , Turkey
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17
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Air Regeneration of Ethanol-Laden Pellet NaY-SiO2 and Pt/NaY-SiO2: Effects of Air Flow Rate on Pt Morphology and Regeneration Efficiency. Catalysts 2018. [DOI: 10.3390/catal8070288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Regeneration process and adsorbent performance were investigated by a fixed-bed adsorber at 300 °C. Surface species, zeolite structure, and Pt morphology were characterized by FT-IR, XRPD and EXAFS, respectively. Performance test results indicated that ethanol adsorption capacity of Pt/NaY-SiO2 is about 2.5 times that of NaY-SiO2. After regeneration, adsorption-capacity loss is 2.5 and 43%, respectively, for Pt/NaY-SiO2 regenerated at superficial velocity of 13.2 (PtR(HF)) and 5.3 cm/min (PtR(LF)); in contrast, it is 8 and 21%, respectively, for NaYR(HF) and NaYR(LF). The appearance of absorption bands in the CH stretching region (υCH) of the IR spectra characterizing the regenerated NaY-SiO2 suggested that the adsorption-capacity loss for NaY-SiO2 was mainly caused by the deposition of carbonaceous species formed in regeneration, which cannot be burned off readily at 300 °C. In contrast, no υCH bands have been observed for the IR spectra of PtR(HF) and PtR(LF), indicating that Pt helps to burn off carbonaceous species. However, Pt agglomeration was observed in TEM and EXAFS for Pt/NaY-SiO2(LF). The appearance of a υCO band at about 2085 cm−1 of the IR spectra characterizing PtR(LF) suggested that Pt agglomeration was induced by CO adsorption. The growth of Pt particles decreases the ethanol adsorbed on Pt together with the conversion of ethanol to ethoxides and aldehyde, leading to a decrease of adsorption capacity.
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18
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Goldsmith BR, Peters B, Johnson JK, Gates BC, Scott SL. Beyond Ordered Materials: Understanding Catalytic Sites on Amorphous Solids. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01767] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bryan R. Goldsmith
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
- Department
of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48105, United States
| | - Baron Peters
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - J. Karl Johnson
- Department
of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Bruce C. Gates
- Department
of Chemical Engineering, University of California, Davis, California 95616, United States
| | - Susannah L. Scott
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
- Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States
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19
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Bion N, Duprez D. Water splitting as a tool for obtaining insight into metal–support interactions in catalysis. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.11.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Liu MC, Hsieh CC, Lee JF, Chang JR. Impact of Pt and V2O5 on Ethanol Removal from Moist Air Using Pellet Silica-Bound NaY. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01628] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ming-Chun Liu
- Department
of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan
| | - Chu-Chin Hsieh
- Department
of Safety, Health and Environmental Engineering, National Yunlin University Science and Technology, Yunlin, Taiwan
| | - Jyh-Fu Lee
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan
| | - Jen-Ray Chang
- Department
of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan
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21
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Chen C, Chen F, Zhang L, Pan S, Bian C, Zheng X, Meng X, Xiao FS. Importance of platinum particle size for complete oxidation of toluene over Pt/ZSM-5 catalysts. Chem Commun (Camb) 2015; 51:5936-8. [DOI: 10.1039/c4cc09383f] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Pt-1.9/ZSM-5 exhibits the highest activity in the removal of toluene due to a balance of Pt dispersion and Pt0 proportion.
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Affiliation(s)
- Chunyu Chen
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Fang Chen
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Ling Zhang
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Shuxiang Pan
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Chaoqun Bian
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Xiaoming Zheng
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Xiangju Meng
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
| | - Feng-Shou Xiao
- Key Lab of Applied Chemistry of Zhejiang Province and Department of Chemistry
- Zhejiang University
- Hangzhou 310007
- China
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22
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Duan L, Fu R, Xiao Z, Zhao Q, Wang JQ, Chen S, Wan Y. Activation of Aryl Chlorides in Water under Phase-Transfer Agent-Free and Ligand-Free Suzuki Coupling by Heterogeneous Palladium Supported on Hybrid Mesoporous Carbon. ACS Catal 2014. [DOI: 10.1021/cs501356h] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Linlin Duan
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Rao Fu
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Zhiguang Xiao
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Qingfei Zhao
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Jian-Qiang Wang
- Shanghai
Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied
Physics, Chinese Academy of Sciences, Shanghai, 201204, P. R. China
| | - Shangjun Chen
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
| | - Ying Wan
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, P. R. China
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23
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Lira E, Merte LR, Behafarid F, Ono LK, Zhang L, Roldan Cuenya B. Role and Evolution of Nanoparticle Structure and Chemical State during the Oxidation of NO over Size- and Shape-Controlled Pt/γ-Al2O3 Catalysts under Operando Conditions. ACS Catal 2014. [DOI: 10.1021/cs500137r] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Lira
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. R. Merte
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - F. Behafarid
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. K. Ono
- Department
of Physics, University of Central Florida, Orlando, Florida 32816, United States
| | - L. Zhang
- Center
for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - B. Roldan Cuenya
- Department
of Physics, Ruhr University Bochum, 44780 Bochum, Germany
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24
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Shpiro ES, Jaeger NI, Schulz-Ekloff G. Structure and Reactivity of Small Metallic and Bimetallic Clusters Hosted in Molecular Sieves. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.199500078] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Zhang F, Xie F, Xu H, Liu J, Oh WC. Characterization of Pd/TiO2 embedded in multi-walled carbon nanotube catalyst with a high photocatalytic activity. KINETICS AND CATALYSIS 2013. [DOI: 10.1134/s002315841303018x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Merte LR, Ahmadi M, Behafarid F, Ono LK, Lira E, Matos J, Li L, Yang JC, Roldan Cuenya B. Correlating Catalytic Methanol Oxidation with the Structure and Oxidation State of Size-Selected Pt Nanoparticles. ACS Catal 2013. [DOI: 10.1021/cs400234h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lindsay R. Merte
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Mahdi Ahmadi
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Farzad Behafarid
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Luis K. Ono
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Estephania Lira
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Jeronimo Matos
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
| | - Long Li
- Department
of Chemical and Petroleum Engineering, Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania
15261, United States
| | - Judith C. Yang
- Department
of Chemical and Petroleum Engineering, Department of Physics, University of Pittsburgh, Pittsburgh, Pennsylvania
15261, United States
| | - Beatriz Roldan Cuenya
- Department of Physics, University of Central Florida, Orlando, Florida 32816,
United States
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27
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Paredis K, Ono LK, Behafarid F, Zhang Z, Yang JC, Frenkel AI, Cuenya BR. Evolution of the structure and chemical state of Pd nanoparticles during the in situ catalytic reduction of NO with H2. J Am Chem Soc 2011; 133:13455-64. [PMID: 21790158 DOI: 10.1021/ja203709t] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An in-depth understanding of the fundamental structure of catalysts during operation is indispensable for tailoring future efficient and selective catalysts. We report the evolution of the structure and oxidation state of ZrO(2)-supported Pd nanocatalysts (∼5 nm) during the in situ reduction of NO with H(2) using X-ray absorption fine-structure spectroscopy and X-ray photoelectron spectroscopy. Prior to the onset of the reaction (≤120 °C), a NO-induced redispersion of our initial metallic Pd nanoparticles over the ZrO(2) support was observed, and Pd(δ+) species were detected. This process parallels the high production of N(2)O observed at the onset of the reaction (>120 °C), while at higher temperatures (≥150 °C) the selectivity shifts mainly toward N(2) (∼80%). Concomitant with the onset of N(2) production, the Pd atoms aggregate again into large (6.5 nm) metallic Pd nanoparticles, which were found to constitute the active phase for the H(2)-reduction of NO. Throughout the entire reaction cycle, the formation and stabilization of PdO(x) was not detected. Our results highlight the importance of in situ reactivity studies to unravel the microscopic processes governing catalytic reactivity.
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Affiliation(s)
- Kristof Paredis
- Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
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28
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Ou DR, Mori T, Togasaki H, Takahashi M, Ye F, Drennan J. Microstructural and metal-support interactions of the Pt-CeO2/C catalysts for direct methanol fuel cell application. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:3859-3866. [PMID: 21395272 DOI: 10.1021/la1032898] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
To understand the ceria promotion effect of Pt-CeO(2)/C catalysts on methanol oxidation, microstructural and metal-oxide interactions of Pt-CeO(2)/C catalysts with an atomic ratio of Pt/Ce between 0.14 and 1.4 were systematically examined using high-resolution transmission electron microscopy and electron energy loss spectroscopy (EELS). With an increasing Pt content in the catalysts, Pt particles gradually invaded into the ceria supports and decoration on Pt particles was observed. Simultaneously, the morphology of the supports was dramatically modified with nanocrystalline and amorphous ceria formed between and/or around the Pt particles. It reveals that the Pt-ceria interaction could take place in the catalysts and the influence of the interaction was enhanced with an increasing Pt/Ce ratio. The EELS study demonstrated that the strong Pt-ceria interaction was related to the redox reaction between Pt and ceria. Experimental results also suggested that the strong interaction between Pt and ceria could contribute to the promotion effect of ceria on the oxidation of methanol.
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Affiliation(s)
- Ding Rong Ou
- Laboratory of Fuel Cells, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, China.
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29
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Kim MY, Seo G, Park JH, Shin CH, Kim ES. Dispersion and Stability of Platinum Catalysts Supported on Titania-, Vanadia-, Zirconia- and Ceria-Incorporated Silicas. KOREAN CHEMICAL ENGINEERING RESEARCH 2011. [DOI: 10.9713/kcer.2011.49.1.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Kulkarni A, Lobo-Lapidus RJ, Gates BC. Metal clusters on supports: synthesis, structure, reactivity, and catalytic properties. Chem Commun (Camb) 2010; 46:5997-6015. [DOI: 10.1039/c002707n] [Citation(s) in RCA: 121] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Blanchard J, Bando KK, Breysse M, Geantet C, Lacroix M, Yoshimura Y. Investigation of the thiotolerance of metallic ruthenium nanoparticles: A XAS study. Catal Today 2009. [DOI: 10.1016/j.cattod.2008.10.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Chotisuwan S, Wittayakun J, Lobo-Lapidus RJ, Gates BC. MgO-supported cluster catalysts with Pt–Ru interactions prepared from Pt3Ru6(CO)21(μ3-H)(μ-H)3. Catal Letters 2007. [DOI: 10.1007/s10562-007-9119-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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33
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Fonseca GS, Machado G, Teixeira SR, Fecher GH, Morais J, Alves MCM, Dupont J. Synthesis and characterization of catalytic iridium nanoparticles in imidazolium ionic liquids. J Colloid Interface Sci 2006; 301:193-204. [PMID: 16780858 DOI: 10.1016/j.jcis.2006.04.073] [Citation(s) in RCA: 185] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 04/11/2006] [Accepted: 04/23/2006] [Indexed: 11/18/2022]
Abstract
The reduction of [Ir(cod)Cl](2) (cod=1,5-cyclooctadiene) dissolved in 1-n-butyl-3-methyl tetrafluoroborate, hexafluorophosphate and trifluoromethane sulphonate ionic liquids in the presence of 1-decene by molecular hydrogen produces Ir(0) nanoparticles. The formation of these nanoparticles follows the two-step [A-->B, A+B-->2B (k(1),k(2))] autocatalytic mechanism. The same mean diameter values of around 2-3 nm were estimated from in situ TEM and SAXS analyses of the Ir(0) nanoparticles dispersed in the ionic liquids and by XRD of the isolated material. XPS and EXAFS analyses clearly show the interactions of the ionic liquid with the metal surface demonstrating the formation of an ionic liquid protective layer surrounding the iridium nanoparticles. SAXS analysis indicated the formation of an ionic liquid layer surrounding the metal particles with an extended molecular length of around 2.8-4.0 nm depending on the type of the anion.
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Affiliation(s)
- Gledison S Fonseca
- Laboratory of Molecular Catalysis, Institute of Chemistry and Institute of Physics, UFRGS, Avenida Bento Gonçalves, 9500 Porto Alegre, RS 91501-970, Brazil
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34
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Cho SJ, Lee J, Lee YS, Kim DP. Characterization of Iridium Catalyst for Decomposition of Hydrazine Hydrate for Hydrogen Generation. Catal Letters 2006. [DOI: 10.1007/s10562-006-0081-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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35
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Fierro-Gonzalez JC, Kuba S, Hao Y, Gates BC. Oxide- and Zeolite-Supported Molecular Metal Complexes and Clusters: Physical Characterization and Determination of Structure, Bonding, and Metal Oxidation State. J Phys Chem B 2006; 110:13326-51. [PMID: 16821852 DOI: 10.1021/jp0571123] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This article is a review of the physical characterization of well-defined site-isolated molecular metal complexes and metal clusters supported on metal oxides and zeolites. These surface species are of interest primarily as catalysts; as a consequence of their relatively uniform structures, they can be characterized much more precisely than traditional supported catalysts. The properties discussed in this review include metal nuclearity, oxidation state, and ligand environment, as well as metal-support interactions. These properties are determined by complementary techniques, including transmission electron microscopy; X-ray absorption, infrared, Raman, and NMR spectroscopies; and density functional theory. The strengths and limitations of these techniques are assessed in the context of results characterizing samples that have been investigated thoroughly and with multiple techniques. The depth of understanding of well-defined metal complexes and metal clusters on supports is approaching that attainable for molecular analogues in solution. The results provide a foundation for understanding the more complex materials that are typical of industrial catalysts.
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Affiliation(s)
- Juan C Fierro-Gonzalez
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, USA
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36
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Chotisuwan S, Wittayakun J, Gates BC. Pt3Ru6Clusters Supported on γ-Al2O3: Synthesis from Pt3Ru6(CO)21(μ3-H)(μ-H)3, Structural Characterization, and Catalysis of Ethylene Hydrogenation andn-Butane Hydrogenolysis. J Phys Chem B 2006; 110:12459-69. [PMID: 16800573 DOI: 10.1021/jp057550+] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The supported clusters Pt-Ru/gamma-Al2O3 were prepared by adsorption of the bimetallic precursor Pt3Ru6(CO)21(mu3-H)(mu-H)3 from CH2Cl2 solution onto gamma-Al2O3 followed by decarbonylation in He at 300 degrees C. The resultant supported clusters were characterized by infrared (IR) and extended X-ray absorption fine structure (EXAFS) spectroscopies and as catalysts for ethylene hydrogenation and n-butane hydrogenolysis. After adsorption, the nu(CO) peaks characterizing the precursor shifted to lower wavenumbers, and some of the hydroxyl bands of the support disappeared or changed, indicating that the CO ligands of the precursor interacted with support hydroxyl groups. The EXAFS results show that the metal core of the precursor remained essentially unchanged upon adsorption, but there were distortions of the metal core indicated by changes in the metal-metal distances. After decarbonylation of the supported clusters, the EXAFS data indicated that Pt and Ru atoms interacted with support oxygen atoms and that about half of the Pt-Ru bonds were maintained, with the composition of the metal frame remaining almost unchanged. The decarbonylated supported bimetallic clusters reported here are the first having essentially the same metal core composition as that of a precursor metal carbonyl, and they appear to be the best-defined supported bimetallic clusters. The material was found to be an active catalyst for ethylene hydrogenation and n-butane hydrogenolysis under conditions mild enough to prevent substantial cluster disruption.
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Affiliation(s)
- Saowapa Chotisuwan
- School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima, Thailand
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37
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Liang AJ, Bhirud VA, Ehresmann JO, Kletnieks PW, Haw JF, Gates BC. A Site-Isolated Rhodium−Diethylene Complex Supported on Highly Dealuminated Y Zeolite: Synthesis and Characterization. J Phys Chem B 2005; 109:24236-43. [PMID: 16375419 DOI: 10.1021/jp054623g] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of Rh(C2H4)2(acac) with the partially dehydroxylated surface of dealuminated zeolite Y (calcined at 773 K) and treatments of the resultant surface species in various atmospheres (He, CO, H2, and D2) were investigated with infrared (IR), extended X-ray absorption fine structure (EXAFS), and 13C NMR spectroscopies. The IR spectra show that Rh(C2H4)2(acac) reacted readily with surface OH groups of the zeolite, leading to loss of acac ligands from the Rh(C2H4)2(acac) and formation of supported mononuclear rhodium complexes, confirmed by the lack of Rh-Rh contributions in the EXAFS spectra; each Rh atom was bonded on average to two oxygen atoms of the zeolite surface with a Rh-O distance of 2.19 A. IR, EXAFS, and 13C NMR spectra show that the ethylene ligands remained bonded to the Rh center in the supported complex. Treatment of the sample in CO led to the formation of site-isolated Rh(CO)2 complexes bonded to the zeolite. The sharpness of the nu(CO) bands in the IR spectrum gives evidence of a nearly uniform supported Rh(CO)2 complex and, by inference, the near uniformity of the mononuclear rhodium complex with ethylene ligands from which it was formed. The supported complex with ethylene ligands reacted with H2 to give ethane, and it also catalyzed ethylene hydrogenation at 294 K.
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Affiliation(s)
- Ann J Liang
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, USA
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Guzman J, Anderson BG, Vinod CP, Ramesh K, Niemantsverdriet JW, Gates BC. Synthesis and reactivity of dimethyl gold complexes supported on MgO: characterization by infrared and X-ray absorption spectroscopies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:3675-3683. [PMID: 15807620 DOI: 10.1021/la0470434] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Dimethyl gold complexes bonded to partially dehydroxylated MgO powder calcined at 673 K were synthesized by adsorption of Au(CH3)2(acac) (acac is C5H7O2) from n-pentane solution. The synthesis and subsequent decomposition of the complexes by treatment in He or H2 were characterized with diffuse reflectance Fourier transform infrared (DRIFT), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) spectroscopies. The XANES results identify Au(III) in the supported complexes, and the EXAFS and DRIFTS data indicate mononuclear dimethyl gold complexes as the predominant surface gold species, consistent with the lack of Au-Au contributions in the EXAFS spectrum and the presence of nu(as)(CH3) and nu(s)(CH3) bands in the IR spectrum. EXAFS data show that each complex is bonded to two oxygen atoms of the MgO surface at an Au-O distance of 2.16 angstroms. The DRIFT spectra show that reaction of Au(CH3)2(acac) with MgO at room temperature also formed Mg(acac)2 and H(acac) species on the support. Treatment of the dimethyl gold complexes in He or H2 at increasing temperatures varying from 373 to 573 K removed CH3 ligands and caused aggregation forming zerovalent gold nanoclusters of increasing size, ultimately with an average diameter of about 30 angstroms. Analysis of the gas-phase products during the genesis of the gold clusters indicated formation of CH4 (consistent with removal of CH3 groups) and CO2 at 473-573 K, associated with decomposition of the organic ligands derived from acac species. O2 and CO2 were also formed in the decomposition of ubiquitous carbonates present on the surface of the MgO support.
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Affiliation(s)
- Javier Guzman
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, USA
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Su WB, Tang MT, Chang JR. Rejuvenation of Moisture-Exposed Pd/δ-Al2O3 Catalysts for Isoprene-Selective Hydrogenation: Correlation between Pd Dispersion and Catalytic Properties. Ind Eng Chem Res 2005. [DOI: 10.1021/ie049054y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Bin Su
- Center for Nano-technology Design & Prototyping, Department of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C., and National Synchrotron Radiation Research Center, Hsinchu, Taiwan, R.O.C
| | - Mau-Tsu Tang
- Center for Nano-technology Design & Prototyping, Department of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C., and National Synchrotron Radiation Research Center, Hsinchu, Taiwan, R.O.C
| | - Jen-Ray Chang
- Center for Nano-technology Design & Prototyping, Department of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C., and National Synchrotron Radiation Research Center, Hsinchu, Taiwan, R.O.C
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Tanizawa Y, Shido T, Chun WJ, Asakura K, Nomura M, Iwasawa Y. Three-Dimensional Structure Analyses of Cu Species Dispersed on TiO2(110) Surfaces Studied by Polarization-Dependent Total-Reflection Fluorescence X-ray Absorption Fine Structure (PTRF-XAFS). J Phys Chem B 2003. [DOI: 10.1021/jp0306186] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yasuhiro Tanizawa
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Takafumi Shido
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Wang-Jae Chun
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Kiyotaka Asakura
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Masaharu Nomura
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
| | - Yasuhiro Iwasawa
- Department of Chemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, Catalysis Research Center (CRC), Hokkaido University, Kita 11-10, Kita-ku, Sapporo 060-0811, Japan, and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK−IMSS−PF), Oho 1-1, Tsukuba 305-0801, Japan
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41
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Chen HI, Shiau JD, Chu CY, Huang TC. Synthesis and characterization of palladium clusters dispersed alumina membranes. Sep Purif Technol 2003. [DOI: 10.1016/s1383-5866(03)00066-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Alexeev OS, Graham GW, Shelef M, Adams RD, Gates BC. γ-Al2O3-Supported PtRu Clusters Prepared from [Pt2Ru4(CO)18]: Characterization by Infrared and Extended X-ray Absorption Fine Structure Spectroscopies. J Phys Chem B 2002. [DOI: 10.1021/jp014342i] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oleg S. Alexeev
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, Ford Research Laboratory, Ford Motor Co., Dearborn, Michigan 48121, and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - George W. Graham
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, Ford Research Laboratory, Ford Motor Co., Dearborn, Michigan 48121, and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Mordecai Shelef
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, Ford Research Laboratory, Ford Motor Co., Dearborn, Michigan 48121, and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Richard D. Adams
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, Ford Research Laboratory, Ford Motor Co., Dearborn, Michigan 48121, and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Bruce C. Gates
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, Ford Research Laboratory, Ford Motor Co., Dearborn, Michigan 48121, and Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
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Enderle B, Labouriau A, Ott KC, Gates BC. Osmium Carbonyls in Zeolite NaX: Characterization by 129Xe NMR and Extended X-ray Absorption Fine Structure Spectroscopies. J Phys Chem B 2002. [DOI: 10.1021/jp0128224] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bryan Enderle
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, and Chemical Science and Technology Division, Mail Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - Andrea Labouriau
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, and Chemical Science and Technology Division, Mail Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - Kevin C. Ott
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, and Chemical Science and Technology Division, Mail Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - Bruce C. Gates
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616, and Chemical Science and Technology Division, Mail Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Gates B. Supported nanostructured catalysts: Metal complexes and metal clusters. ADVANCES IN CHEMICAL ENGINEERING 2001. [DOI: 10.1016/s0065-2377(01)27003-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Cho SJ, Kang SK. Reversible Structural Transformation of Palladium Catalyst Supported on La−Al2O3 Probed with X-ray Absorption Fine Structure. J Phys Chem B 2000. [DOI: 10.1021/jp991857p] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sung June Cho
- Catalytic Combustion Research Team, Korea Institute of Energy Research, 71-2, Jang-dong, Yusung-gu, Taejon 305-343, Korea
| | - Sung Kyu Kang
- Catalytic Combustion Research Team, Korea Institute of Energy Research, 71-2, Jang-dong, Yusung-gu, Taejon 305-343, Korea
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Increased Sulfur Tolerance of Pt/KL Catalysts Prepared by Vapor-Phase Impregnation and Containing a Tm Promoter. J Catal 2000. [DOI: 10.1006/jcat.1999.2779] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Delage M, Didillon B, Huiban Y, Lynch J, Uzio D. Highly dispersed Pd based catalysts for selective hydrogenation reactions. STUDIES IN SURFACE SCIENCE AND CATALYSIS 2000. [DOI: 10.1016/s0167-2991(00)80332-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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49
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Ferrari AM, Neyman KM, Mayer M, Staufer M, Gates BC, Rösch N. Faujasite-Supported Ir4 Clusters: A Density Functional Model Study of Metal−Zeolite Interactions. J Phys Chem B 1999. [DOI: 10.1021/jp990369e] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Maria Ferrari
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
| | - Konstantin M. Neyman
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
| | - Markus Mayer
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
| | - Markus Staufer
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
| | - Bruce C. Gates
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
| | - Notker Rösch
- Lehrstuhl für Theoretische Chemie, Technische Universität München, D-85747 Garching, Germany, Dipartimento di Scienza dei Materiali, Istituto Nazionale della Materia, via Cozzi 53, I-20125 Milano, Italy, and Institut für Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), D-81377 München, Germany
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50
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Chun WJ, Asakura K, Iwasawa Y. Polarization-Dependent Total-Reflection Fluorescence XAFS Study of Mo Oxides on a Rutile TiO2(110) Single Crystal Surface. J Phys Chem B 1998. [DOI: 10.1021/jp9820368] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wang-Jae Chun
- Department of Chemistry and Research Center for Spectrochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kiyotaka Asakura
- Department of Chemistry and Research Center for Spectrochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yasuhiro Iwasawa
- Department of Chemistry and Research Center for Spectrochemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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