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Zachman MJ, Fung V, Polo-Garzon F, Cao S, Moon J, Huang Z, Jiang DE, Wu Z, Chi M. Measuring and directing charge transfer in heterogenous catalysts. Nat Commun 2022; 13:3253. [PMID: 35668115 PMCID: PMC9170698 DOI: 10.1038/s41467-022-30923-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 05/19/2022] [Indexed: 11/09/2022] Open
Abstract
Precise control of charge transfer between catalyst nanoparticles and supports presents a unique opportunity to enhance the stability, activity, and selectivity of heterogeneous catalysts. While charge transfer is tunable using the atomic structure and chemistry of the catalyst-support interface, direct experimental evidence is missing for three-dimensional catalyst nanoparticles, primarily due to the lack of a high-resolution method that can probe and correlate both the charge distribution and atomic structure of catalyst/support interfaces in these structures. We demonstrate a robust scanning transmission electron microscopy (STEM) method that simultaneously visualizes the atomic-scale structure and sub-nanometer-scale charge distribution in heterogeneous catalysts using a model Au-catalyst/SrTiO3-support system. Using this method, we further reveal the atomic-scale mechanisms responsible for the highly active perimeter sites and demonstrate that the charge transfer behavior can be readily controlled using post-synthesis treatments. This methodology provides a blueprint for better understanding the role of charge transfer in catalyst stability and performance and facilitates the future development of highly active advanced catalysts.
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Affiliation(s)
- Michael J Zachman
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
| | - Victor Fung
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.,Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Felipe Polo-Garzon
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Shaohong Cao
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Jisue Moon
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Zhennan Huang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - De-En Jiang
- Department of Chemistry, University of California, Riverside, CA, 92521, USA
| | - Zili Wu
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Miaofang Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
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2
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Deng X, Ding Y, Wang X, Jia X, Zhang S, Li X. Insight into the Properties of Plasmonic Au/TiO 2 Activated by O 2/Ar Plasma. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 12:106. [PMID: 35010056 PMCID: PMC8746676 DOI: 10.3390/nano12010106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 12/20/2021] [Accepted: 12/24/2021] [Indexed: 06/14/2023]
Abstract
The performance of CO oxidation over plasmonic Au/TiO2 photocatalysts is largely determined by the electric discharge characteristics and physicochemical properties of discharge gas. To explore the activation mechanism of Au/TiO2, an O2 and Ar mixture gas as a discharge gas was employed to activate Au/TiO2. The photocatalytic activity in CO oxidation over activated Au/TiO2 was obtained, and the electric discharge characteristics, Au nanoparticle size, surface chemical state, optical property and CO chemisorption were thoroughly characterized. As the O2 content increases from 10% to 50%, the amplitude of the current pulses increases, but the number of pulses and the discharge power decrease. The photocatalytic activity of Au/TiO2 rises rapidly at first and then remains constant at 75% when the O2 content is above 50%. Compared with the discharge gas of 10% and 30% O2/Ar, the sample activated by 50% O2/Ar plasma possesses less metallic Au and more surface oxygen species and carbonate species by X-ray photoelectron spectroscopy, which is consistent with UV-vis diffuse reflectance spectra and CO chemisorption. The CO chemisorption capacities of the activated samples are the same at a long exposure time due to the approximate Au nanoparticle size observed by transmission electron microscopy. An increase in carbonate species generated from the oxygen species on the surface of TiO2 is discovered.
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Affiliation(s)
- Xiaoqing Deng
- School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China; (X.D.); (Y.D.); (X.W.); (X.J.)
| | - Yu Ding
- School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China; (X.D.); (Y.D.); (X.W.); (X.J.)
| | - Xiaobing Wang
- School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China; (X.D.); (Y.D.); (X.W.); (X.J.)
| | - Xiaojing Jia
- School of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, China; (X.D.); (Y.D.); (X.W.); (X.J.)
| | - Shuo Zhang
- School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;
| | - Xiang Li
- College of Mechanical Engineering, Yangtze University, Jingzhou 434023, China
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3
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Abstract
Atomically precise metal clusters are now in the research spotlight, owing to the precise correlation between the physicochemical properties and their atomic-packing structures at an atomic-level. Herein we synthesized an Au8 cluster capped by four ferrocene ligands (DPPF), in which the ferrocene not only can direct the precise formation of the Au8 cluster, but also can solidify the structural pattern of the Au8 cluster. The Au8(DPPF)4 clusters as heterogeneous catalysts can achieve efficiently catalytic performances for the CO oxidation reaction, mainly due to the resistance to aggregation into large particles under reaction conditions. Our results suggest that the homolytic phosphine dissociation nature and the postdissociation reconstruction effect induced by Fe may enhance the catalytic performances of Au8(DPPF)4.
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Affiliation(s)
- Shuo Hao Li
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Xu Liu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Weigang Hu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
| | - Mingyang Chen
- Center for Green Innovation, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China.,Beijing Computational Science Research Center, Beijing 100193, P. R. China
| | - Yan Zhu
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
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4
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Synthesis of bimetallic AuPt/CeO2 catalysts and their comparative study in CO oxidation under different reaction conditions. REACTION KINETICS MECHANISMS AND CATALYSIS 2019. [DOI: 10.1007/s11144-019-01545-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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5
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Carabineiro S, Papista E, Marnellos G, Tavares P, Maldonado-Hódar F, Konsolakis M. Catalytic decomposition of N 2 O on inorganic oxides: Εffect of doping with Au nanoparticles. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.04.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Abstract
Glucose is the most common but important aldehyde, and it is necessary to create biosensors with high sensitivity and anti-interference to detect it. Under the existence of silver ions and aldehyde compounds, single gold nanoparticles and freshly formed silver atoms could respectively act as core and shell, which finally form a core-shell structure. By observing the reaction between glucose and Tollens' reagent, metallic silver was found to be reduced on the surface of gold nanoparticles and formed Au@Ag nanoparticles that lead to a direct wavelength shift. Based on this principle and combined with in situ plasmon resonance scattering spectra, a plasmonic nanosensor was successfully applied in identifying aldehyde compounds with excellent sensitivity and specificity. This ultrasensitive sensor was successfully further utilized to detect blood glucose in mice serum samples, exhibiting good anti-interference ability and great promise for future clinical application.
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Affiliation(s)
| | - Lei Shi
- Shanghai Qingpu Water Authority, 35 Xidayingangyi Road, Shanghai, 201799, P. R. China
| | | | - Chao Jing
- Physik-Department
E20, Technische Universität München, James-Franck-Strasse 1 D-85748 Garching, Germany
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7
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Wu Z, Hu G, Jiang DE, Mullins DR, Zhang QF, Allard LF, Wang LS, Overbury SH. Diphosphine-Protected Au 22 Nanoclusters on Oxide Supports Are Active for Gas-Phase Catalysis without Ligand Removal. NANO LETTERS 2016; 16:6560-6567. [PMID: 27685318 DOI: 10.1021/acs.nanolett.6b03221] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Investigation of atomically precise Au nanoclusters provides a route to understand the roles of coordination, size, and ligand effects on Au catalysis. Herein, we explored the catalytic behavior of a newly synthesized Au22(L8)6 nanocluster (L = 1,8-bis(diphenylphosphino) octane) with in situ uncoordinated Au sites supported on TiO2, CeO2, and Al2O3. Stability of the supported Au22 nanoclusters was probed structurally by in situ extended X-ray absorption fine structure (EXAFS) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and their ability to adsorb and oxidize CO was investigated by IR absorption spectroscopy and a temperature-programmed flow reaction. Low-temperature CO oxidation activity was observed for the supported pristine Au22(L8)6 nanoclusters without ligand removal. Density functional theory (DFT) calculations confirmed that the eight uncoordinated Au sites in the intact Au22(L8)6 nanoclusters can chemisorb both CO and O2. Use of isotopically labeled O2 demonstrated that the reaction pathway occurs mainly through a redox mechanism, consistent with the observed support-dependent activity trend of CeO2 > TiO2 > Al2O3. We conclude that the uncoordinated Au sites in the intact Au22(L8)6 nanoclusters are capable of adsorbing CO, activating O2, and catalyzing CO oxidation reaction. This work is the first clear demonstration of a ligand-protected intact Au nanocluster that is active for gas-phase catalysis without the need of ligand removal.
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Affiliation(s)
- Zili Wu
- Chemical Science Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Guoxiang Hu
- Department of Chemistry, University of California , Riverside, California 92521, United States
| | - De-En Jiang
- Department of Chemistry, University of California , Riverside, California 92521, United States
| | - David R Mullins
- Chemical Science Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Qian-Fan Zhang
- Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States
| | - Lawrence F Allard
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Lai-Sheng Wang
- Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States
| | - Steven H Overbury
- Chemical Science Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
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8
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Liu Y, Zhao G, Wang D, Li Y. Heterogeneous catalysis for green chemistry based on nanocrystals. Natl Sci Rev 2015. [DOI: 10.1093/nsr/nwv014] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Abstract
Modern society has an ever-increasing demand for environmentally friendly catalytic processes. Catalysis research is working towards a solution through the development of effective heterogeneous catalysts for environment-related applications. Nanotechnologies have provided effective strategies for the preparation of nanocrystals (NCs) with well-defined sizes, shapes and compositions. Precise control of these NCs provides an important foundation for the studies of structure-performance relationships in catalysis, which is critical to the design of NCs with optimized catalytic performances for practical applications. We focus on recent advances in the development of bottom-up strategies to control NCs structures for some key catalytic applications, including CO oxidation, selective oxidation of alcohols, semihydrogenation of alkynes, and selective hydrogenation of unsaturated aldehydes and nitrobenzene. These key applications have been a popular research focus because of their significance in green chemistry. Herein we also discuss the scientific understandings of the active species and active structures of these systems to gain an insight for rational design of efficient catalytic systems for these catalytic reactions.
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Affiliation(s)
- Yuxi Liu
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Guofeng Zhao
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yadong Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
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9
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Tan W, Guo G, Deng J, Xie S, Yang H, Jiang Y, Dai H. Au/Ce0.6Zr0.3Y0.1O2 Nanorods: Highly Active Catalysts for the Oxidation of Carbon Monoxide and Toluene. Ind Eng Chem Res 2014. [DOI: 10.1021/ie503784e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Tan
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Guangsheng Guo
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Jiguang Deng
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Shaohua Xie
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Huanggen Yang
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Yang Jiang
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Hongxing Dai
- Key Laboratory of Beijing
on Regional Air Pollution Control, Beijing Key Laboratory for Green
Catalysis and Separation, and Laboratory of Catalysis Chemistry and
Nanoscience, Department of Chemistry and Chemical Engineering, College
of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
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10
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Li J, Chang X, Chen X, Gu Z, Zhao F, Chai Z, Zhao Y. Toxicity of inorganic nanomaterials in biomedical imaging. Biotechnol Adv 2014; 32:727-43. [DOI: 10.1016/j.biotechadv.2013.12.009] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 12/12/2013] [Accepted: 12/13/2013] [Indexed: 11/27/2022]
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11
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Wu Z, Jiang DE, Mann AKP, Mullins DR, Qiao ZA, Allard LF, Zeng C, Jin R, Overbury SH. Thiolate Ligands as a Double-Edged Sword for CO Oxidation on CeO2 Supported Au25(SCH2CH2Ph)18 Nanoclusters. J Am Chem Soc 2014; 136:6111-22. [DOI: 10.1021/ja5018706] [Citation(s) in RCA: 220] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
| | | | | | | | | | | | - Chenjie Zeng
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Rongchao Jin
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
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12
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Mesoporous Co3O4-supported gold nanocatalysts: Highly active for the oxidation of carbon monoxide, benzene, toluene, and o-xylene. J Catal 2014. [DOI: 10.1016/j.jcat.2013.10.019] [Citation(s) in RCA: 284] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Gong XQ, Yin LL, Zhang J, Wang HF, Cao XM, Lu G, Hu P. Computational Simulation of Rare Earth Catalysis. CATALYSIS AND KINETICS - MOLECULAR LEVEL CONSIDERATIONS 2014. [DOI: 10.1016/b978-0-12-419974-3.00001-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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Xie S, Dai H, Deng J, Liu Y, Yang H, Jiang Y, Tan W, Ao A, Guo G. Au/3DOM Co3O4: highly active nanocatalysts for the oxidation of carbon monoxide and toluene. NANOSCALE 2013; 5:11207-11219. [PMID: 24080987 DOI: 10.1039/c3nr04126c] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Three-dimensionally ordered macroporous Co3O4 (3DOM Co3O4) and its supported gold (xAu/3DOM Co3O4, x = 1.1-8.4 wt%) nanocatalysts were prepared using the polymethyl methacrylate-templating and bubble-assisted polyvinyl alcohol-protected reduction methods, respectively. The 3DOM Co3O4 and xAu/3DOM Co3O4 samples exhibited a surface area of 22-27 m(2) g(-1). The Au nanoparticles with a size of 2.4-3.7 nm were uniformly deposited on the macropore walls of 3DOM Co3O4. There were good correlations of oxygen adspecies concentration and low-temperature reducibility with catalytic activity of the sample for CO and toluene oxidation. Among 3DOM Co3O4 and xAu/3DOM Co3O4, the 6.5Au/3DOM Co3O4 sample performed the best, giving a T90% (the temperature required for achieving a conversion of 90%) of -35 °C at a space velocity of 20 000 mL g(-1) h(-1) for CO oxidation and 256 °C at a space velocity of 40 000 mL g(-1) h(-1) for toluene oxidation. The effect of water vapor was more significant in toluene oxidation than in CO oxidation. The apparent activation energies (26 and 74 kJ mol(-1)) over 6.5Au/3DOM Co3O4 were lower than those (34 and 113 kJ mol(-1)) over 3DOM Co3O4 for CO and toluene oxidation, respectively. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and strong interaction between Au and 3DOM Co3O4 were responsible for the excellent catalytic performance of 6.5Au/3DOM Co3O4.
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Affiliation(s)
- Shaohua Xie
- Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China. ;
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15
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Juan-Alcañiz J, Ferrando-Soria J, Luz I, Serra-Crespo P, Skupien E, Santos VP, Pardo E, Llabrés i Xamena FX, Kapteijn F, Gascon J. The oxamate route, a versatile post-functionalization for metal incorporation in MIL-101(Cr): Catalytic applications of Cu, Pd, and Au. J Catal 2013. [DOI: 10.1016/j.jcat.2013.08.001] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Hussain A, Gracia J, Nieuwenhuys BE, Niemantsverdriet JWH. Explicit Roles of Au and TiO2in a Bifunctional Au/TiO2Catalyst for the Water-Gas Shift Reaction: A DFT Study. ChemCatChem 2013. [DOI: 10.1002/cctc.201300105] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Shi L, Jing C, Ma W, Li DW, Halls JE, Marken F, Long YT. Plasmon resonance scattering spectroscopy at the single-nanoparticle level: real-time monitoring of a click reaction. Angew Chem Int Ed Engl 2013; 52:6011-4. [PMID: 23616358 DOI: 10.1002/anie.201301930] [Citation(s) in RCA: 137] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Indexed: 11/09/2022]
Abstract
A method based on plasmon resonance Rayleigh scattering (PRRS) spectroscopy and dark-field microscopy (DFM) was established for the real-time monitoring of a click reaction at the single-nanoparticle level. Click reactions on the surface of single gold nanoparticles (GNPs) result in interparticle coupling, which leads to a red-shift of the λmax (Δλmax =43 nm) in the PRRS spectra and a color change of the single gold nanoparticles in DFM (from green to orange).
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Affiliation(s)
- Lei Shi
- State Key Laboratory of Bioreactor Engineering, & Department of Chemistry, East China University of Science and Technology, Shanghai, 200237, PR China
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18
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Shi L, Jing C, Ma W, Li DW, Halls JE, Marken F, Long YT. Plasmon Resonance Scattering Spectroscopy at the Single-Nanoparticle Level: Real-Time Monitoring of a Click Reaction. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301930] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Origin of the high activity of Au/FeOx for low-temperature CO oxidation: Direct evidence for a redox mechanism. J Catal 2013. [DOI: 10.1016/j.jcat.2012.11.019] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Jimenez-Lam SA, Martinez-Ramirez Z, Santos-López IA, Handy BE, Cárdenas-Galindo MG, Fierro-Gonzalez JC. Role of iron carbonyls in the inhibition of oxygen activation for the oxidation of CO catalyzed by iron oxide-supported gold. Chemphyschem 2012; 13:4173-9. [PMID: 23150146 DOI: 10.1002/cphc.201200665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Indexed: 11/11/2022]
Abstract
Iron oxide-supported gold samples were prepared by co-precipitation from HAuCl(4) and Fe(NO(3))(3). The activities of the samples as CO oxidation catalysts were tested without thermal treatment and following treatments in flows of He and O(2) at various temperatures. It was found that the untreated samples and those treated in a flow of He at 150 °C were more active than samples that had been treated at 400 °C in either a flow of O(2) or of He. Infrared spectra recorded during CO oxidation catalysis indicate the presence of bonded CO molecules to cationic gold on all samples, whereas spectra of the least active catalysts indicate a predominant presence of Fe(2+) carbonyls, which were highly stable under the conditions of our experiments. Our results indicate that in the least active samples the Fe(2+)-bound CO blocks sites that would otherwise be available for oxygen activation.
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Affiliation(s)
- Sergio A Jimenez-Lam
- Departamento de Ingeniería Química, Instituto Tecnológico de Celaya, Av. Tecnológico y Antonio García Cubas s/n. Celaya, GTO, 38010, Mexico
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21
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Nitrogen oxides and SO2 adsorption on Au/MOR catalyst: Adsorption sites, thermodynamic and vibrational frequencies. ONIOM study. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2012.07.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Tian C, Chai SH, Zhu X, Wu Z, Binder A, Bauer JC, Brwon S, Chi M, Veith GM, Guo Y, Dai S. In situ growth synthesis of heterostructured LnPO4–SiO2 (Ln = La, Ce, and Eu) mesoporous materials as supports for small gold particles used in catalytic CO oxidation. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm35416k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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de Almeida MP, Carabineiro SAC. The Best of Two Worlds from the Gold Catalysis Universe: Making Homogeneous Heterogeneous. ChemCatChem 2011. [DOI: 10.1002/cctc.201100288] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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24
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del Río E, Blanco G, Collins S, Haro ML, Chen X, Delgado JJ, Calvino JJ, Bernal S. CO Oxidation Activity of a Au/Ceria-Zirconia Catalyst Prepared by Deposition–Precipitation with Urea. Top Catal 2011. [DOI: 10.1007/s11244-011-9711-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Lee Y, He G, Akey AJ, Si R, Flytzani-Stephanopoulos M, Herman IP. Raman analysis of mode softening in nanoparticle CeO(2-δ) and Au-CeO(2-δ) during CO oxidation. J Am Chem Soc 2011; 133:12952-5. [PMID: 21780802 DOI: 10.1021/ja204479j] [Citation(s) in RCA: 182] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxygen vacancy levels are monitored during the oxidation of CO by CeO(2-δ) nanorods and Au-CeO(2-δ) nanorods, nanocubes, and nanopolyhedra by using Raman scattering. The first-order CeO(2) F(2g) peak near 460 cm(-1) decreases when this reaction is fast (fast reduction and relatively slow reoxidation of the surface), because of the lattice expansion that occurs when Ce(3+) replaces Ce(4+) during oxygen vacancy creation. This shift correlates with reactivity for CO oxidation. Increases in the oxygen deficit δ as large as ~0.04 are measured relative to conditions when the ceria is not reduced.
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Affiliation(s)
- Youjin Lee
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
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Zhu WJ, Zhang J, Gong XQ, Lu G. A density functional theory study of small Au nanoparticles at CeO2 surfaces. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.11.085] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Guan Y, Ligthart DAJM, Pirgon-Galin Ö, Pieterse JAZ, van Santen RA, Hensen EJM. Gold Stabilized by Nanostructured Ceria Supports: Nature of the Active Sites and Catalytic Performance. Top Catal 2011. [DOI: 10.1007/s11244-011-9673-2] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Hong YC, Sun KQ, Han KH, Liu G, Xu BQ. Comparison of catalytic combustion of carbon monoxide and formaldehyde over Au/ZrO2 catalysts. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.05.017] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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29
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Guo N, Fingland BR, Williams WD, Kispersky VF, Jelic J, Delgass WN, Ribeiro FH, Meyer RJ, Miller JT. Determination of CO, H2O and H2 coverage by XANES and EXAFS on Pt and Au during water gas shift reaction. Phys Chem Chem Phys 2010; 12:5678-93. [PMID: 20442915 DOI: 10.1039/c000240m] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The turn-over-rate (TOR) for the water gas shift (WGS) reaction at 200 degrees C, 7% CO, 9% CO(2), 22% H(2)O, 37% H(2) and balance Ar, of 1.4 nm Au/Al(2)O(3) is approximately 20 times higher than that of 1.6 nm Pt/Al(2)O(3). Operando EXAFS experiments at both the Au and Pt L(3) edges reveal that under reaction conditions, the catalysts are fully metallic. In the absence of adsorbates, the metal-metal bond distances of Pt and Au catalysts are 0.07 A and 0.13 A smaller than those of bulk Pt and Au foils, respectively. Adsorption of H(2) or CO on the Pt catalysts leads to significantly longer Pt-Pt bond distances; while there is little change in Au-Au bond distance with adsorbates. Adsorption of CO, H(2) and H(2)O leads to changes in the XANES spectra that can be used to determine the surface coverage of each adsorbate under reaction conditions. During WGS, the coverage of CO, H(2)O, and H(2) are obtained by the linear combination fitting of the difference XANES, or DeltaXANES, spectra. Pt catalysts adsorb CO, H(2), and H(2)O more strongly than the Au, in agreement with the lower CO reaction order and higher reaction temperatures.
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Affiliation(s)
- Neng Guo
- Chemical Sciences and Engineering Division, Argonne National Lab, Argonne, IL 60439-4837, USA
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Tomska-Foralewska I, Przystajko W, Pietrowski M, Zieliński M, Wojciechowska M. Effect of MgO content in the support of Au/MgF2–MgO catalysts on CO oxidation. REACTION KINETICS MECHANISMS AND CATALYSIS 2010. [DOI: 10.1007/s11144-010-0171-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Veith G, Lupini A, Pennycook S, Dudney N. Influence of Support Hydroxides on the Catalytic Activity of Oxidized Gold Clusters. ChemCatChem 2010. [DOI: 10.1002/cctc.200900243] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Camellone MF, Fabris S. Reaction Mechanisms for the CO Oxidation on Au/CeO2 Catalysts: Activity of Substitutional Au3+/Au+ Cations and Deactivation of Supported Au+ Adatoms. J Am Chem Soc 2009; 131:10473-83. [PMID: 19722624 DOI: 10.1021/ja902109k] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matteo Farnesi Camellone
- Theory@Elettra Group, INFM-CNR DEMOCRITOS, c/o Sincrotrone Trieste−SS14, Km 163, 5 Basovizza, I-34012 Trieste, Italy, and SISSA Scuola Internazionale Superiore di Studi Avanzati, via Beirut 2-4, I-34014 Trieste, Italy
| | - Stefano Fabris
- Theory@Elettra Group, INFM-CNR DEMOCRITOS, c/o Sincrotrone Trieste−SS14, Km 163, 5 Basovizza, I-34012 Trieste, Italy, and SISSA Scuola Internazionale Superiore di Studi Avanzati, via Beirut 2-4, I-34014 Trieste, Italy
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Haider P, Grunwaldt JD, Baiker A. Gold supported on Mg, Al and Cu containing mixed oxides: Relation between surface properties and behavior in catalytic aerobic oxidation of 1-phenylethanol. Catal Today 2009. [DOI: 10.1016/j.cattod.2008.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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34
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Low temperature carbon monoxide oxidation over gold nanoparticles supported on sodium titanate nanotubes. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2008.10.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Novo C, Funston AM, Mulvaney P. Direct observation of chemical reactions on single gold nanocrystals using surface plasmon spectroscopy. NATURE NANOTECHNOLOGY 2008; 3:598-602. [PMID: 18838998 DOI: 10.1038/nnano.2008.246] [Citation(s) in RCA: 275] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Accepted: 07/30/2008] [Indexed: 05/25/2023]
Abstract
Heterogeneous catalysts have been pivotal to the development of the modern chemical industry and are essential for catalysing many industrial reactions. However, reaction rates are different for every individual catalyst particle and depend upon each particle's morphology and size, crystal structure and composition. Measuring the rates of reaction on single nanocrystals will enable the role of catalyst structure to be quantified. Here, using surface plasmon spectroscopy, we have directly observed the kinetics of atomic deposition onto a single gold nanocrystal and also monitored electron injection and extraction during a redox reaction involving the oxidation of ascorbic acid on a gold nanocrystal surface. These results constitute the first direct measurement of the rates of redox catalysis on single nanocrystals.
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Affiliation(s)
- Carolina Novo
- School of Chemistry & Bio21 Institute, University of Melbourne, Parkville, Vic. 3010, Australia
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36
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Zhong Z, Highfield J, Lin M, Teo J, Han YF. Insights into the oxidation and decomposition of CO on Au/alpha-Fe2O3 and on alpha-Fe2O3 by coupled TG-FTIR. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:8576-8582. [PMID: 18605709 DOI: 10.1021/la800395k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
CO oxidation and decomposition behaviors over nanosized 3% Au/alpha-Fe2O3 catalyst and over the alpha-Fe2O3 support were studied in situ via thermogravimetry coupled to on-line FTIR spectroscopy (TG-FTIR), which was used to obtain temperature-programmed reduction (TPR) curves and evolved gas analysis. The catalyst was prepared by a sonication-assisted Au colloid based method and had a Au particle size in the range of 2-5 nm. Carburization studies of H 2-prereduced samples were also made in CO gas. According to gravimetry, for the 3% Au/alpha-Fe2O3 catalyst, there were three distinct stages of CO interaction with the Au catalyst but only two stages for the catalyst support. At low temperatures (<or=100 degrees C), only the Au catalyst had a rapid weight loss, which confirmed that CO reacted with highly active absorbed oxygen species and/or OH species which were associated with and promoted by the Au nanoparticles. Around 300 degrees C, both the catalyst and support samples experienced the reduction of Fe2O3 to Fe3O4, while above 400 degrees C further reduction to FeO and Fe metal took place. Au played no part in the kinetics of Fe3O4 formation because lattice O mobility was rate-limiting. At higher temperature where Fe3O4 was further reduced to FeO and Fe 0, the initially formed metallic Fe 0 nuclei could decompose CO molecules and release O species. Both this coproduced O species and the lattice oxygen could react with CO molecules. Thus, the CO oxidation was not limited by the mobility of lattice oxygen, and the catalytic function of Au was revealed again. Carburization of metallic Fe, created by prereduction in H 2, revealed a distinct weight gain at 350 degrees C corresponding to Fe 3C formation, as subsequently confirmed by X-ray diffraction (XRD). Sustained carbon deposition ensued at 450 degrees C. In the cases of the 3% Au/gamma-Al 2O 3 and Au/ZrO 2 catalysts prepared by the same method, however, after exposure to CO in the same temperature range, no carbon deposit was observed, indicating that although Au nanoparticles could activate the absorbed oxygen molecules at low temperatures, they were not able to activate the lattice oxygen in the three catalyst supports or to dissociate the CO molecules directly.
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Affiliation(s)
- Ziyi Zhong
- Institute of Chemical Engineering and Sciences, Jurong Island, Singapore.
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37
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Fierro-Gonzalez JC, Gates BC. Catalysis by gold dispersed on supports: the importance of cationic gold. Chem Soc Rev 2008; 37:2127-34. [PMID: 18762849 DOI: 10.1039/b707944n] [Citation(s) in RCA: 167] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There are many examples of catalysis in solution by cationic complexes of gold, and recent results, reviewed here in this critical review, demonstrate that cationic gold species on oxide and zeolite supports are also catalytically active, for reactions including ethylene hydrogenation and CO oxidation. The catalytically active gold species on supports are evidently not restricted to isolated mononuclear gold complexes, but include gold clusters, which for at least some reactions are more active than the mononuclear complexes and for some reactions less active. Fundamental questions remain about the nature of cationic gold in supported catalysts, such as the nature of the cationic gold clusters and the nature of gold atoms at metal-support interfaces (88 references).
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Affiliation(s)
- Juan C Fierro-Gonzalez
- Departamento de Ingeniería Química, Instituto Tecnológico de Celaya, Celaya, GTO 38010, Mexico
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Mihaylov M, Ivanova E, Hao Y, Hadjiivanov K, Gates BC, Knözinger H. Oxidation by CO2of Au0species on La2O3-supported gold clusters. Chem Commun (Camb) 2008:175-7. [DOI: 10.1039/b713106b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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