1
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Hussain A, Javaid S. Water dissociation and COOH formation on Fe modified Cu(100) surface: A density functional theory study. J Mol Graph Model 2024; 132:108829. [PMID: 39032367 DOI: 10.1016/j.jmgm.2024.108829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 07/04/2024] [Accepted: 07/15/2024] [Indexed: 07/23/2024]
Abstract
Water splitting has emerged as a promising route for sustainable hydrogen production. In this research paper, adsorption and dissociation of H2O accompanied with dissociated constituents reactions with CO2 and CO have been investigated on Fe modified Cu(100) surface employing density functional theory (DFT) at GGA-PW91 level. The adsorption and other reactions carried out on Fe2-Cu(100) surfaces gave very promising results. The adsorption of H2O on Fe top of this surface occurs yielding Eads -1.73 eV, which highlights a favorable adsorption on the Fe-modified Cu(100) surface. The activation energy for the water splitting reaction is found to be 0.65 eV, suggesting a feasible pathway for hydrogen evolution. The process also accompanies reaction energy of -0.54 eV. Furthermore, the interaction between carbon dioxide (CO2) and the H-atom on the surface lead to the formation of COOH through surmounting an activation barrier of 1.09 eV. The final position of COOH gets further stabilization having exothermicity of -0.43 eV. Another route for COOH formation from CO + OH operates on the Cu(100) part of the surface with a small activation barrier of 0.14 eV through exothermic process of -0.29 eV, however, diffusion of CO and OH from Fe to Cu is energetically expensive. This study signifies the consumption of CO and CO2 in addition to water splitting giving birth to useful products.
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Affiliation(s)
- Akhtar Hussain
- TPD, Pakistan Institute of Nuclear Science & Technology (PINSTECH), P. O. Nilore, Islamabad, Pakistan.
| | - Saqib Javaid
- TPD, Pakistan Institute of Nuclear Science & Technology (PINSTECH), P. O. Nilore, Islamabad, Pakistan
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2
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Pang K, Ren R, Lv Y, Wang GC. Theoretical insight into the promotion effect of potassium additive on the water-gas shift reaction over low-coordinated Au catalysts. J Mol Model 2023; 29:250. [PMID: 37452193 DOI: 10.1007/s00894-023-05649-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/03/2023] [Indexed: 07/18/2023]
Abstract
CONTEXT How to elucidate the effect of alkali metal promoters on gold-catalyzed water-gas shift reaction intrinsically remains a challenging, because that the complex synergy effects such as strong metal-support interactions, interfacial effects, and charge transfer of supported metal catalysts makes people difficulty in the understanding the alkali promotion phenomenon in nature. Herein, we report a systematically study of whole water-gas shift reaction mechanism on pure and the K-modified defected-Au(211) (i.e., by removing one surface Au atom from perfect Au(211) and make one model with the Au-Au coordination number is six) by using the microkinetic modeling based on first principles. Our results indicate that the presence of K can increase the adsorption ability of oxygen-containing species via the attractive coulomb interaction, has no significant effect on the adsorption of H species, but inhibits the adsorption of CO due to the steric effect. K promoter stabilizes the water adsorption by ~0.3 eV, which results in one order increasing of whole reaction rate. Interestingly, the strong promotion effect of the K can be assigned to the significant direct space interaction between K and the adsorbate H2O* through the inducted electric field, which can be further confirmed by the posed negative electric field on the unpromoted D-Au(211). Microkinetic modeling results revealed that the carboxyl mechanism is the most likely to occur, redox mechanism is the next one, and the formate mechanism is the least likely to occur. For different kinds of alkali metal additives, the adsorption strength of water molecules gradually weakens from Li to Cs, but Na shows the best promoter behavior at the low temperature. By considering the effect of K contents on the reactivity of water-gas shift reaction, we found that the K with the medium coverage (~0.2~0.3 ML) has the strongest promoting effect. It is expected that the conclusion of this work can be extended to other WGSR catalytic systems like Cu(or Pt). METHODS All calculations were performed by using the plane-wave based periodic method implemented in Vienna ab initio simulation package (VASP, version 5.4.4), where the ionic cores are described by the projector augmented wave (PAW) method. The exchange and correlation energies were computed using the Perdew, Burke and Ernzerhof functional with the vdw correction (PBE-D3). The transition states (TSs) were searched using the climbing image nudged elastic band (CI-NEB) method. Some electronic structure properties like work function was predicated by the DS-PAW software. Microkinetic simulation was carried out using MKMCXX software.
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Affiliation(s)
- Ke Pang
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China
| | - Ruipeng Ren
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China
| | - Yongkang Lv
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China.
| | - Gui-Chang Wang
- College of Chemistry, Nankai University, Tianjin, 300071, China.
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3
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Wu F, Du Y, Lv S, Zhao C, Yang X. DFT Modeling of CO 2 Adsorption and HCOO • Group Conversion in Anatase Au-TiO 2-Based Photocatalysis. ACS OMEGA 2022; 7:7179-7189. [PMID: 35252708 PMCID: PMC8892660 DOI: 10.1021/acsomega.1c06861] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 02/08/2022] [Indexed: 05/19/2023]
Abstract
Due to the merits of carbon circulation and hydrocarbon production, solar-assisted photocatalysis has been regarded as an ideal option for securing a sustainable future of energy and environment. In the photocatalytic carbon cycle process, surface reactions including the adsorption of CO2 and the conversion of CO2 into CH4, CH3OH, etc. are crucial to be examined ascribed to their significant influence on the performance of the photocatalysis. Because the conversion reaction starts from the formation of HCOO•, the density functional theory (DFT) model was established in this study to investigate the micromechanism of CO2 adsorption and the conversion of CO2 to HCOO• group in the anatase Au-TiO2 photocatalytic system. The CO2 adsorption bonding in six configurations was simulated, on which basis the effects of the proportion of water molecules and the lattice temperature increase due to the local surface plasmon resonance (LSPR) on the photocatalytic CO2 adsorption and conversion were specifically analyzed. The results show that the experimental conditions that water molecules are released before CO2 are favorable for the formation of the adsorption configuration in which HCOO• tends to be produced without the need of reaction activation energy. This is reasonable since the intermediate C atoms do not participate in bonding under these conditions. Moreover, Au clusters have an insignificant influence on the adsorption behaviors of CO2 including the adsorption sites and configurations on TiO2 surfaces. As a result, the reaction rate is reduced due to the temperature increase caused by the LSPR effect. Nevertheless, the reaction maintains a very high rate. Interestingly, configurations that require activation energy are also possible to be resulted, which exerts a positive influence of temperature on the conversion rate of CO2. It is found that the rate of the reaction can be improved by approximately 1-10 times with a temperature rise of 50 K above the ambient.
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Affiliation(s)
- Feitong Wu
- China-UK
Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
| | - Yanping Du
- China-UK
Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
| | - Sijia Lv
- China-UK
Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
| | - Changying Zhao
- China-UK
Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
- Institute
of Engineering Thermophysics, Shanghai Jiao
Tong University, Shanghai 200240, China
| | - Xiang Yang
- China-UK
Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
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4
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Tang Y, Chen Y, Liu X, Wang C, Zhao Y, Chen R, Shan B. Facet-dependent activity of shape-controlled TiO2 supported Au nanoparticles for the water–gas shift reaction. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01823j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Temperature-dependent interfacial catalysis of Au/TiO2 catalysts for the water–gas shift (WGS) reaction.
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Affiliation(s)
- Yuanting Tang
- State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Yongjie Chen
- State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Xiao Liu
- State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - ChengXiong Wang
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal, Kunming Institute of Precious Metals, Kunming 650106, Yunnan, People's Republic of China
| | - Yunkun Zhao
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal, Kunming Institute of Precious Metals, Kunming 650106, Yunnan, People's Republic of China
| | - Rong Chen
- State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
| | - Bin Shan
- State Key Laboratory of Materials Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People's Republic of China
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5
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Wolf M, Roberts SJ, Marquart W, Olivier EJ, Luchters NTJ, Gibson EK, Catlow CRA, Neethling JH, Fischer N, Claeys M. Synthesis, characterisation and water-gas shift activity of nano-particulate mixed-metal (Al, Ti) cobalt oxides. Dalton Trans 2019; 48:13858-13868. [PMID: 31483416 DOI: 10.1039/c9dt01634a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of mixed-metal cobalt oxides, representing potential metal-support compounds for cobalt-based catalysts, has been observed at high conversion levels in the Fischer-Tropsch synthesis over metal oxide-supported cobalt catalysts. An often observed increase in the carbon dioxide selectivity at Fischer-Tropsch conversion levels above 80% has been suggested to be associated to the formation of water-gas shift active oxidic cobalt species. Mixed-metal cobalt oxides, namely cobalt aluminate and cobalt titanate, were therefore synthesised and tested for potential catalytic activity in the water-gas shift reaction. We present a preparation route for amorphous mixed-metal oxides via thermal treatment of metal precursors in benzyl alcohol. Calcination of the as prepared nanoparticles results in highly crystalline phases. The nano-particulate mixed-metal cobalt oxides were thoroughly analysed by means of X-ray diffraction, Raman spectroscopy, temperature-programmed reduction, X-ray absorption near edge structure spectroscopy, extended X-ray absorption fine structure, and high-resolution scanning transmission electron microscopy. This complementary characterisation of the synthesised materials allows for a distinct identification of the phases and their properties. The cobalt aluminate prepared has a cobalt-rich composition (Co1+xAl2-xO4) with a homogeneous atomic distribution throughout the nano-particulate structures, while the perovskite-type cobalt titanate (CoTiO3) features cobalt-lean smaller particles associated with larger ones with an increased concentration of cobalt. The cobalt aluminate prepared showed no water-gas shift activity in the medium-shift temperature range, while the cobalt titanate sample catalysed the conversion of water and carbon monoxide to hydrogen and carbon dioxide after an extended activation period. However, this perovskite underwent vast restructuring forming metallic cobalt, a known catalyst for the water-gas shift reaction at temperatures exceeding typical conditions for the cobalt-based Fischer-Tropsch synthesis, and anatase-TiO2. The partial reduction of the mixed-metal oxide and segregation was identified by means of post-run characterisation using X-ray diffraction, Raman spectroscopy, and transmission electron microscopy energy-dispersive spectrometry.
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Affiliation(s)
- Moritz Wolf
- Catalysis Institute, Department of Chemical Engineering, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
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6
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Whittaker T, Kumar KBS, Peterson C, Pollock MN, Grabow LC, Chandler BD. H2 Oxidation over Supported Au Nanoparticle Catalysts: Evidence for Heterolytic H2 Activation at the Metal–Support Interface. J Am Chem Soc 2018; 140:16469-16487. [DOI: 10.1021/jacs.8b04991] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Todd Whittaker
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - K. B. Sravan Kumar
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Christine Peterson
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Meagan N. Pollock
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Lars C. Grabow
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Bert D. Chandler
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
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7
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Saavedra J, Pursell CJ, Chandler BD. CO Oxidation Kinetics over Au/TiO2 and Au/Al2O3 Catalysts: Evidence for a Common Water-Assisted Mechanism. J Am Chem Soc 2018; 140:3712-3723. [DOI: 10.1021/jacs.7b12758] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Johnny Saavedra
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
- Pacific Northwest National Laboratory Institute for Integrated Catalysis, Richland, Washington 99352, United States
| | - Christopher J. Pursell
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
| | - Bert D. Chandler
- Department of Chemistry, Trinity University, San Antonio, Texas 78212-7200, United States
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8
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Gu L, Su Q, Jiang W, Yao Y, Pang Y, Ji W, Au CT. How do the unique Au/α-Fe2O3 interfacial structures determine activity in CO oxidation? Catal Sci Technol 2018. [DOI: 10.1039/c8cy01467a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unique Au/α-Fe2O3 interfacial structures and the interface-associated intermediates critically determine the activity of CO oxidation.
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Affiliation(s)
- Lingli Gu
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Qin Su
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Wu Jiang
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Yao Yao
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Yijun Pang
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Weijie Ji
- Key Laboratory of Mesoscopic Chemistry
- MOE
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Chak-Tong Au
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- Hong Kong
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9
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Ma Z, Lin S, Sa R, Li Q, Wu K. A comprehensive understanding of water photooxidation on Ag3PO4 surfaces. RSC Adv 2017. [DOI: 10.1039/c7ra02853a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A systematic study of the mechanism of OER on Ag3PO4 surfaces by combining hybrid DFT calculations and first principles thermodynamics.
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Affiliation(s)
- Zuju Ma
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
- China
| | - Sen Lin
- State Key Laboratory of Photocatalysis on Energy and Environment
- College of Chemistry
- Fuzhou University
- Fuzhou 350002
- China
| | - Rongjian Sa
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
- China
| | - Qiaohong Li
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
- China
| | - Kechen Wu
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou 350002
- China
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10
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Saqlain MA, Novais Antunes FP, Hussain A, Siddiq M, Leitão AA. Adsorption of oxygen and CO oxidation on Au/anatase(001) catalysts. A DFT+U study. NEW J CHEM 2017. [DOI: 10.1039/c6nj02744j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Active oxygen for CO oxidation over Au/TiO2 is a highly stable atomic species, which is formed at the perimeter of the Au/oxide interface.
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Affiliation(s)
| | | | - Akhtar Hussain
- TPD
- Pakistan Institute of Nuclear Science and Technology
- PINSTECH
- Islamabad
- Pakistan
| | - Muhammad Siddiq
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad
- Pakistan
| | - Alexandre A. Leitão
- Departamento de Química
- Universidade Federal de Juiz de Fora
- Juiz de Fora
- Brazil
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11
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Kotolevich Y, Kolobova E, Khramov E, Cabrera Ortega JE, Farías MH, Zubavichus Y, Zanella R, Mota-Morales JD, Pestryakov A, Bogdanchikova N, Cortés Corberán V. Identification of Subnanometric Ag Species, Their Interaction with Supports and Role in Catalytic CO Oxidation. Molecules 2016; 21:532. [PMID: 27110757 PMCID: PMC6273660 DOI: 10.3390/molecules21040532] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 04/07/2016] [Accepted: 04/15/2016] [Indexed: 11/16/2022] Open
Abstract
The nature and size of the real active species of nanoparticulated metal supported catalysts is still an unresolved question. The technique of choice to measure particle sizes at the nanoscale, HRTEM, has a practical limit of 1 nm. This work is aimed to identify the catalytic role of subnanometer species and methods to detect and characterize them. In this frame, we investigated the sensitivity to redox pretreatments of Ag/Fe/TiO₂, Ag/Mg/TiO₂ and Ag/Ce/TiO₂ catalysts in CO oxidation. The joint application of HRTEM, SR-XRD, DRS, XPS, EXAFS and XANES methods indicated that most of the silver in all samples is in the form of Ag species with size <1 nm. The differences in catalytic properties and sensitivity to pretreatments, observed for the studied Ag catalysts, could not be explained taking into account only the Ag particles whose size distribution is measured by HRTEM, but may be explained by the presence of the subnanometer Ag species, undetectable by HRTEM, and their interaction with supports. This result highlights their role as active species and the need to take them into account to understand integrally the catalysis by supported nanometals.
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Affiliation(s)
- Yulia Kotolevich
- Departamento de Fisicoquímica de Nanomateriales, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México (UNAM), Ensenada 22860, Mexico.
| | - Ekaterina Kolobova
- Department of Physical and Analytical Chemistry, Tomsk Polytechnic University, Tomsk 634050, Russia.
| | - Evgeniy Khramov
- National Research Center "Kurchatov Institute", Moscow 123182, Russia.
| | - Jesús Efren Cabrera Ortega
- Departamento de Fisica Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada 22860, Mexico.
| | - Mario H Farías
- Departamento de Fisicoquímica de Nanomateriales, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México (UNAM), Ensenada 22860, Mexico.
| | - Yan Zubavichus
- National Research Center "Kurchatov Institute", Moscow 123182, Russia.
| | - Rodolfo Zanella
- Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México (UNAM), México, DF 04510, Mexico.
| | - Josué D Mota-Morales
- Departamento de Fisicoquímica de Nanomateriales, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México (UNAM), Ensenada 22860, Mexico.
- CONACYT Research Fellow at Centro de Nanociencias y Nanotecnología, UNAM, Ensenada 22860, Mexico.
| | - Alexey Pestryakov
- Department of Physical and Analytical Chemistry, Tomsk Polytechnic University, Tomsk 634050, Russia.
| | - Nina Bogdanchikova
- Departamento de Fisicoquímica de Nanomateriales, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México (UNAM), Ensenada 22860, Mexico.
| | - Vicente Cortés Corberán
- Institute of Catalysis and Petroleumchemistry (ICP), Spanish Council for Scientific Research (CSIC), Madrid 28049, Spain.
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12
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Saqlain MA, Hussain A, Siddiq DM, Leenaerts O, Leitão AA. DFT Study of Synergistic Catalysis of the Water-Gas-Shift Reaction on Cu-Au Bimetallic Surfaces. ChemCatChem 2016. [DOI: 10.1002/cctc.201501312] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Muhammad Adnan Saqlain
- Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
- Departamento de Química; Universidade Federal de Juiz de Fora; Juiz de Fora, MG, CEP 36036-330 Brazil
| | - Akhtar Hussain
- TPD, Pakistan Institute of Nuclear Science and Technology, PINSTECH, P. O. Nilore; Islamabad Pakistan
| | - Dr Muhammad Siddiq
- Department of Chemistry; Quaid-i-Azam University; Islamabad 45320 Pakistan
| | | | - Alexandre A. Leitão
- Departamento de Química; Universidade Federal de Juiz de Fora; Juiz de Fora, MG, CEP 36036-330 Brazil
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13
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Roşca DA, Wright JA, Bochmann M. An element through the looking glass: exploring the Au-C, Au-H and Au-O energy landscape. Dalton Trans 2015; 44:20785-807. [PMID: 26584519 PMCID: PMC4669034 DOI: 10.1039/c5dt03930d] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 11/12/2015] [Indexed: 11/21/2022]
Abstract
Gold, the archetypal "noble metal", used to be considered of little interest in catalysis. It is now clear that this was a misconception, and a multitude of gold-catalysed transformations has been reported. However, one consequence of the long-held view of gold as inert metal is that its organometallic chemistry contains many "unknowns", and catalytic cycles devised to explain gold's reactivity draw largely on analogies with other transition metals. How realistic are such mechanistic assumptions? In the last few years a number of key compound classes have been discovered that can provide some answers. This Perspective attempts to summarise these developments, with particular emphasis on recently discovered gold(iii) complexes with bonds to hydrogen, oxygen, alkenes and CO ligands.
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Affiliation(s)
- Dragoş-Adrian Roşca
- School of Chemistry , University of East Anglia , Norwich , NR4 7TJ , UK . ; Tel: +44 (0)16035 92044
- Max-Planck-Institut für Kohlenforschung , D-45470 Mülheim/Ruhr , Germany
| | - Joseph A. Wright
- School of Chemistry , University of East Anglia , Norwich , NR4 7TJ , UK . ; Tel: +44 (0)16035 92044
| | - Manfred Bochmann
- School of Chemistry , University of East Anglia , Norwich , NR4 7TJ , UK . ; Tel: +44 (0)16035 92044
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14
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Roşca DA, Fernandez-Cestau J, Morris J, Wright JA, Bochmann M. Gold(III)-CO and gold(III)-CO2 complexes and their role in the water-gas shift reaction. SCIENCE ADVANCES 2015; 1:e1500761. [PMID: 26601313 PMCID: PMC4646827 DOI: 10.1126/sciadv.1500761] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 06/30/2015] [Indexed: 06/05/2023]
Abstract
The water-gas shift (WGS) reaction is an important process for the generation of hydrogen. Heterogeneous gold catalysts exhibit good WGS activity, but the nature of the active site, the oxidation state, and competing reaction mechanisms are very much matters of debate. Homogeneous gold WGS systems that could shed light on the mechanism are conspicuous by their absence: gold(I)-CO is inactive and gold(III)-CO complexes were unknown. We report the synthesis of the first example of an isolable CO complex of Au(III). Its reactivity demonstrates fundamental differences between the CO adducts of the neighboring d (8) ions Pt(II) and Au(III): whereas Pt(II)-CO is stable to moisture, Au(III)-CO compounds are extremely susceptible to nucleophilic attack and show WGS reactivity at low temperature. The key to understanding these dramatic differences is the donation/back-donation ratio of the M-CO bond: gold-CO shows substantially less back-bonding than Pt-CO, irrespective of closely similar ν(CO) frequencies. Key WGS intermediates include the gold-CO2 complex [(C^N^C)Au]2(μ-CO2), which reductively eliminates CO2. The species identified here are in accord with Au(III) as active species and a carboxylate WGS mechanism.
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15
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Upadhye AA, Ro I, Zeng X, Kim HJ, Tejedor I, Anderson MA, Dumesic JA, Huber GW. Plasmon-enhanced reverse water gas shift reaction over oxide supported Au catalysts. Catal Sci Technol 2015. [DOI: 10.1039/c4cy01183j] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible light driven plasmon-enhanced reverse water gas shift reaction over Au/TiO2catalysts for CO2conversion.
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Affiliation(s)
- Aniruddha A. Upadhye
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
| | - Insoo Ro
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
| | - Xu Zeng
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
| | - Hyung Ju Kim
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
| | - Isabel Tejedor
- Department of Civil and Environmental Engineering
- University of Wisconsin-Madison
- USA
| | - Marc A. Anderson
- Department of Civil and Environmental Engineering
- University of Wisconsin-Madison
- USA
| | - James A. Dumesic
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
| | - George W. Huber
- Department of Chemical and Biological Engineering
- University of Wisconsin-Madison
- USA
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16
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Saqlain MA, Hussain A, Siddiq M, Leitão AA. Synergy between Pd and Au in a Pd–Au(100) bimetallic surface for the water gas shift reaction: a DFT study. RSC Adv 2015. [DOI: 10.1039/c5ra07163a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Density functional theory calculations were performed to model a reaction relevant bimetallic surface and study the water gas shift reaction.
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Affiliation(s)
| | - Akhtar Hussain
- TPD
- Pakistan Institute of Nuclear Science and Technology
- PINSTECH
- Islamabad
- Pakistan
| | - Muhammad Siddiq
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad
- Pakistan
| | - Alexandre A. Leitão
- Departamento de Química
- Universidade Federal de Juiz de Fora
- Juiz de Fora
- Brazil
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