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Zhao B, Zhang X, Mao J, Wang Y, Zhang G, Zhang ZC, Guo X. Crystal-Plane-Dependent Guaiacol Hydrodeoxygenation Performance of Au on Anatase TiO2. Catalysts 2023. [DOI: 10.3390/catal13040699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023] Open
Abstract
TiO2-supported catalysts have been widely used for a range of both liquid-phase and gas-phase hydrogenation reactions. However, little is known about the effect of their different crystalline surfaces on their activity during the hydrodeoxygenation process. In this work, Au supported on anatase TiO2, mainly exposing 101 or 001 facets, was investigated for the hydrodeoxygenation (HDO) of guaiacol. At 300 °C, the strong interaction between the Au and TiO2-101 surface resulted in the facile reduction of the TiO2-101 surface with concomitant formation of oxygen vacancies, as shown by the H2-TPR and H2-TPD profiles. Meanwhile, the formation of Auδ−, as determined by CO-DRIFT spectra and in situ XPS, was found to promote the demethylation of guaiacol producing methane. However, this strong interaction was absent on the Au/TiO2-001 catalyst since TiO2-001 was relatively difficult to be reduced compared with TiO2-101. The Au on TiO2-001 just served as the active site for the dissociation of hydrogen without the formation of Auδ−. The hydrogen atoms spilled over to the surface of TiO2-001 to form a small amount of oxygen vacancies, which resulted in lower activity than that over Au/TiO2-101. The catalytic activity of the Au/TiO2 catalyst for hydrodeoxygenation will be controlled by tuning the crystal plane of the TiO2 support.
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Affiliation(s)
- Bin Zhao
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Xiaoqiang Zhang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jingbo Mao
- College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China
| | - Yanli Wang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Guanghui Zhang
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zongchao Conrad Zhang
- State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xinwen Guo
- State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
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2
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Zanganeh N, Guda VK, Toghiani H, Keith JM. Sinter-Resistant and Highly Active Sub-5 nm Bimetallic Au-Cu Nanoparticle Catalysts Encapsulated in Silica for High-Temperature Carbon Monoxide Oxidation. ACS APPLIED MATERIALS & INTERFACES 2018; 10:4776-4785. [PMID: 29328617 DOI: 10.1021/acsami.7b19299] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel gold-copper-based silica-encapsulated mixed metal oxide (MMO) core-shell catalyst-with sub-5 nm MMO particles-was successfully synthesized via a reverse micelle process. The SiO2-encapsulated MMO catalyst was reduced under hydrogen flow to produce an Au-Cu@SiO2 catalyst. X-ray diffraction and X-ray photoelectron spectroscopy characterization confirmed the presence of Au-Cu nanocomposites in the catalyst, while transmission electron microscopy characterization revealed the core-shell structure of the catalyst with the presence of sub-5 nm Au-Cu nanoparticle cores inside SiO2 shells. Brunauer-Emmett-Teller surface characterization identified that the catalyst is porous and bimodal in nature. The effects of promoter metal ion, catalyst pretreatment (calcination), and the presence of CO2 in the feed stream on carbon monoxide (CO) oxidation over the Au-Cu@SiO2 catalyst were examined in the temperature range of 50-400 °C. A catalyst stability test was performed at 300 °C by conducting a CO oxidation reaction for 116 h on stream. The catalyst exhibited excellent efficacy for CO oxidation, with ∼100% conversion to CO2 achieved at 400 °C. While the presence of Cu enhanced the CO conversion at low to intermediate temperatures (50-300 °C), silica encapsulation of the Au-Cu nanocomposites facilitated remarkable stability of the catalyst. The activity of the Au-Cu@SiO2 catalyst is suitable for its application in automotive after-treatment devices, especially in low-temperature combustion engine exhausts.
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Affiliation(s)
- Navid Zanganeh
- Dave C. Swalm School of Chemical Engineering and ‡Bagley College of Engineering, Mississippi State University , Mississippi State, Mississippi 39762, United States
| | - Vamshi Krishna Guda
- Dave C. Swalm School of Chemical Engineering and ‡Bagley College of Engineering, Mississippi State University , Mississippi State, Mississippi 39762, United States
| | - Hossein Toghiani
- Dave C. Swalm School of Chemical Engineering and ‡Bagley College of Engineering, Mississippi State University , Mississippi State, Mississippi 39762, United States
| | - Jason M Keith
- Dave C. Swalm School of Chemical Engineering and ‡Bagley College of Engineering, Mississippi State University , Mississippi State, Mississippi 39762, United States
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3
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Pt-Au/MO x-CeO₂ (M = Mn, Fe, Ti) Catalysts for the Co-Oxidation of CO and H₂ at Room Temperature. Molecules 2017; 22:molecules22030351. [PMID: 28264456 PMCID: PMC6155335 DOI: 10.3390/molecules22030351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/17/2017] [Accepted: 02/21/2017] [Indexed: 11/17/2022] Open
Abstract
A series of nanostructured Pt-Au/MOx-CeO2 (M = Mn, Fe, Ti) catalysts were prepared and their catalytic performance for the co-oxidation of carbon monoxide (CO) and hydrogen (H2) were evaluated at room temperature. The results showed that MOx promoted the CO oxidation of Pt-Au/CeO2, but only the TiO2 could enhance co-oxidation of CO and H2 over Pt-Au/CeO2. Related characterizations were conducted to clarify the promoting effect of MOx. Temperature-programmed reduction of hydrogen (H2-TPR) and X-ray photoelectron spectroscopy (XPS) results suggested that MOx could improve the charge transfer from Au sites to CeO2, resulting in a high concentration of Ce3+ and cationic Au species which benefits for the CO oxidation. In-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRIFTS) results indicated that TiO2 could facilitate the oxidation of H2 over the Pt-Au/TiO2-CeO2 catalyst.
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4
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Promising nanostructured gold/metal oxide catalysts for oxidative coupling of benzylamines under eco-friendly conditions. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2015.11.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Hong X, Sun Y, Zhu T, Liu Z. Pt–Au/CeO2 catalysts for the simultaneous removal of carbon monoxide and formaldehyde. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01744k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of Pt–Au/CeO2 catalysts were prepared via the impregnation deposition–precipitation (IDP) and reduction–deposition precipitation (RDP) methods.
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Affiliation(s)
- Xiaowei Hong
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- China
| | - Ye Sun
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- China
| | - Tianle Zhu
- Beijing Key Laboratory of Bio-inspired Energy Materials and Devices
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- China
| | - Zhiming Liu
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
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6
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Zhang Y, Zhao Y, Zhang H, Zhang L, Ma H, Dong P, Li D, Yu J, Cao G. Investigation of oxygen vacancies on Pt- or Au-modified CeO2 materials for CO oxidation. RSC Adv 2016. [DOI: 10.1039/c6ra12049k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Metal (Au or Pt)-modified CeO2 materials with excellent redox ability for the oxidation of CO to CO2 were prepared by a redox precipitation method and a certain amount (4.2%) of oxygen vacancies was necessary to improve the CO oxidation on Pt-CeO2.
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Affiliation(s)
- Yanjie Zhang
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian 116034
- P.R. China
| | - Yanyan Zhao
- Dalian Medical University
- Dalian 116044
- P.R. China
| | - Han Zhang
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian 116034
- P.R. China
| | - Liyuan Zhang
- Dalian Medical University
- Dalian 116044
- P.R. China
| | - Huipeng Ma
- Dalian Medical University
- Dalian 116044
- P.R. China
| | - Peipei Dong
- Dalian Medical University
- Dalian 116044
- P.R. China
| | - Desheng Li
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian 116034
- P.R. China
| | - Jingjie Yu
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian 116034
- P.R. China
| | - Guanying Cao
- Research Institute of Photonics
- Dalian Polytechnic University
- Dalian 116034
- P.R. China
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Sridhar M, Ferri D, Elsener M, van Bokhoven JA, Kröcher O. Promotion of Ammonium Formate and Formic Acid Decomposition over Au/TiO2 by Support Basicity under SCR-Relevant Conditions. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manasa Sridhar
- Paul Scherrer Institut, 5232 Villigen, Switzerland
- ETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, Switzerland
| | - Davide Ferri
- Paul Scherrer Institut, 5232 Villigen, Switzerland
| | | | - Jeroen Anton van Bokhoven
- Paul Scherrer Institut, 5232 Villigen, Switzerland
- ETH Zurich, Institute for Chemical and Bioengineering, 8093 Zurich, Switzerland
| | - Oliver Kröcher
- Paul Scherrer Institut, 5232 Villigen, Switzerland
- École Polytechnique Fédérale de Lausanne (EPFL), Institute of Chemical Sciences and Engineering, 1015 Lausanne, Switzerland
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8
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Zhang P, Guo J, Zhao P, Zhu B, Huang W, Zhang S. Promoting effects of lanthanum on the catalytic activity of Au/TiO2 nanotubes for CO oxidation. RSC Adv 2015. [DOI: 10.1039/c4ra14133d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
TEM image of Au/La2O3–TiO2-NTs. Gold particles were distributed homogeneously on La modified TiO2 NTs.
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Affiliation(s)
- Ping Zhang
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
| | - Jiuli Guo
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
| | - Peng Zhao
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
| | - Bolin Zhu
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
| | - Weiping Huang
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
| | - Shoumin Zhang
- Key Laboratory of Advanced Energy Material Chemistry (MOE)
- Tianjin Key Lab of Metal and Molecule Based Material Chemistry
- and Department of Chemistry
- Nankai University
- Tianjin 300071
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9
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Li L, Chai SH, Binder A, Brown S, Yang SZ, Dai S. Synthesis of MCF-supported AuCo nanoparticle catalysts and the catalytic performance for the CO oxidation reaction. RSC Adv 2015. [DOI: 10.1039/c5ra11487j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AuCo/MCF calcined at 500 °C for 1 h was found to produce the most active and stable catalyst for CO oxidation. In situ FTIR results of AuCo/MCF catalysts with different treatments.
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Affiliation(s)
- Lin Li
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education
- College of Chemistry and Materials Science
- South-Central University for Nationalities
- Wuhan
- China
| | - Song-Hai Chai
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Andrew Binder
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Suree Brown
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
| | - Shi-Ze Yang
- Chemical Sciences Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Sheng Dai
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
- Chemical Sciences Division
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