51
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Affiliation(s)
- Zhenhua Zhang
- Department, Institution, Address 1 Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics, University of Science and Technology of China Hefei 230026 People's Republic of China
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University Jinhua 321004 People's Republic of China
| | - Rui You
- Department, Institution, Address 1 Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics, University of Science and Technology of China Hefei 230026 People's Republic of China
| | - Weixin Huang
- Department, Institution, Address 1 Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics, University of Science and Technology of China Hefei 230026 People's Republic of China
- Dalian National Laboratory for Clean Energy Dalian 116023 People's Republic of China
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52
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Li J, Sun L, Wan Q, Lin J, Lin S, Wang X. α-MoC Supported Noble Metal Catalysts for Water-Gas Shift Reaction: Single-Atom Promoter or Single-Atom Player. J Phys Chem Lett 2021; 12:11415-11421. [PMID: 34792359 DOI: 10.1021/acs.jpclett.1c02762] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this work, we study the water-gas shift (WGS) reaction catalyzed by α-MoC(100) supported typical platinum group metal (PGM) single atoms (Rh1, Pd1, and Pt1) and Au1 via density functional theory calculations. The adsorption energies of key reaction intermediates and the kinetic barriers of the proposed rate-determining step in the WGS were systematically investigated. It is found that Rh1, Pd1, and Pt1 can serve as single-atom promoters (SAPs) to improve the WGS performance of surface Mo atoms on α-MoC(100). The enhanced activity originates from the fact that SAP modifies the electronic structure of Mo active sites. Comparatively, the Au1 species not only acts as an SAP but also directly participates in the catalysis as a single-atom player. The additional experiments with single-atom catalyst performance and kinetic studies confirm the theoretical calculation conclusions. This study can provide a basis to further develop efficient WGS catalysts by tuning the activity of the substrate with intercalation of SAPs.
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Affiliation(s)
- Juan Li
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
| | - Li Sun
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Qiang Wan
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
| | - Jian Lin
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
| | - Sen Lin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P.R. China
| | - Xiaodong Wang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P.R. China
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53
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Chen Y, Li X, Li J, Du Y, Peng Q, Wu L, Xinjun, Li. CeO
2
‐TiO
2
Hybid‐Nanotubes with Tunable Oxygen Vacancies as the Support to Confine Pt Nanoparticles for the Low‐Temperature Water‐Gas Shift Reaction. ChemistrySelect 2021. [DOI: 10.1002/slct.202102823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yaqian Chen
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
- College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100049 P.R. China
| | - Xiangnan Li
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
| | - Juan Li
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
| | - Yubing Du
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
- College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100049 P.R. China
| | - Quanming Peng
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
| | - Liangpeng Wu
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
| | - Xinjun
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
| | - Li
- Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Guangzhou 510640 P.R. China
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54
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Liu R. Dynamic Microkinetic Modeling for Heterogeneously Catalyzed Hydrogenation Reactions: a Coverage-Oriented View. ACS OMEGA 2021; 6:29432-29448. [PMID: 34778616 PMCID: PMC8581974 DOI: 10.1021/acsomega.1c03292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 10/12/2021] [Indexed: 06/13/2023]
Abstract
In most studies, the microkinetics for multistep reactions are numerically solved due to their complexity; the obtained numerical results are only valid under given reaction conditions at a static point. In this work, the microkinetics of heterogeneously catalyzed hydrogenation reactions are analytically solved as a function of three coupled physical parameters, which are energy, reaction rate, and coverage. The results correlate the surface reactions and the gaseous-phased reactant/product by energy and thus provide a dynamic view over the whole reaction process rather than at a static point. The analytical expressions are given for a simple hydrogenation reaction and three more complicated hypothetical hydrogenation reactions with side products, side reaction paths, or even multiple active sites. Compared with the numerical solution, the analytical solution is valid under all reaction conditions in practice and can provide more guidance to optimize the overall outcome or catalyst development.
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55
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Pei Q, Qiu G, Yu Y, Wang J, Tan KC, Guo J, Liu L, Cao H, He T, Chen P. Fabrication of More Oxygen Vacancies and Depression of Encapsulation for Superior Catalysis in the Water-Gas Shift Reaction. J Phys Chem Lett 2021; 12:10646-10653. [PMID: 34704756 DOI: 10.1021/acs.jpclett.1c02857] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Fabrication of sufficient oxygen vacancies and exposure of active sites to reactants are two key factors to obtain high catalytic activity in the water-gas shift (WGS) reaction. However, these two factors are hard to satisfy spontaneously, since the formation of oxygen vacancies and encapsulation of metal nanoparticles are two inherent properties in reducible metal oxide supported catalysts due to the strong metal-support interaction (SMSI) effect. In this work, we find that addition of alkali to an anatase supported Ni catalyst (Ni/TiO2(A)) could well regulate the SMSI to achieve both more oxygen vacancies and depression of encapsulation; therefore, more than 20-fold enhancement in activity is obtained. It is found that the in situ formed titanate species on the catalyst surface is crucial to the formation of oxygen vacancies and depression of encapsulation. Furthermore, the methanation, a common side reaction of the WGS reaction, is successfully suppressed in the whole catalytic process.
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Affiliation(s)
- Qijun Pei
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Guanghao Qiu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jintao Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Khai Chen Tan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianping Guo
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Lin Liu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Hujun Cao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Teng He
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ping Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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56
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Liu X, Ma Z, Meng Y, Ma YJ, Wen XD. First-principles study on the mechanism of water-gas shift reaction on the Fe3O4 (111)-Fetet1. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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57
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El Barraj A, Chatelain B, Barth C. High-temperature oxidation and reduction of the inverse ceria/Cu(111) catalyst characterized by LEED, STM, nc-AFM and KPFM. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:014001. [PMID: 34525469 DOI: 10.1088/1361-648x/ac26f9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The inverse catalyst 'cerium oxide (ceria) on copper' has attracted much interest in recent time because of its promising catalytic activity in the water-gas-shift reaction and the hydrogenation of CO2. For such reactions it is important to study the redox behaviour of this system, in particular with respect to the reduction by H2. Here, we investigate the high-temperature O2oxidation and H2reduction of ceria nanoparticles (NPs) and a Cu(111) support by low energy electron diffraction (LEED), scanning tunnelling microscopy (STM), non-contact atomic force microscopy (nc-AFM) and Kelvin probe force microscopy (KPFM). After oxidation at 550 °C, the ceria NPs and the Cu(111) support are fully oxidized, with the copper oxide exhibiting a new oxide structure as verified by LEED and STM. We show that a high H2dosage in the kilo Langmuir range is needed to entirely reduce the copper support at 550 °C. A work function (WF) difference of △ϕrCeria/Cu-Cu≈ -0.6 eV between the ceria NPs and the metallic Cu(111) support is measured, with the Cu(111) surface showing no signatures of separated and confined surface regions composed by an alloy of Cu and Ce. After oxidation, the WF difference is close to zero (△ϕCeria/Cu-Cu≈ -0.1…0 eV), which probably is due to a WF change of both, ceria and copper.
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58
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Dong Z, Liu W, Zhang L, Wang S, Luo L. Structural Evolution of Cu/ZnO Catalysts during Water-Gas Shift Reaction: An In Situ Transmission Electron Microscopy Study. ACS APPLIED MATERIALS & INTERFACES 2021; 13:41707-41714. [PMID: 34427430 DOI: 10.1021/acsami.1c11839] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supported metal catalysts experience significant structural evolution during the activation process and reaction conditions, which is critical to achieve a desired active surface and interface enabling efficient catalytic processes. However, such dynamic structural information and related mechanistic understandings remain largely elusive owing to the limitation of real-time capturing dynamic information under reaction conditions. Here, using in situ environment transmission electron microscopy, we demonstrate the atomic-scale structural evolution of the model Cu/ZnO catalyst under relevant water-gas shift reaction (WGSR) conditions. Under a CO gas environment, Cu nanoparticles decompose into smaller Cu species and redistribute on ZnO supports with either the crystalline Cu2O or amorphous CuOx phase due to a strong CO-Cu interaction. In addition, we visualize various metal-support interactions between Cu and ZnO under reaction conditions, e.g., ZnO clusters precipitating on Cu nanoparticles, which are critical to understand active sites of Cu/ZnO as catalysts for WGSR. These in situ atomic-scale observations highlight the dynamic interplays between Cu and ZnO that can be extended to other supported metal catalysts.
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Affiliation(s)
- Zejian Dong
- Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, P. R. China
| | - Wei Liu
- Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, P. R. China
| | - Lifeng Zhang
- Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, P. R. China
| | - Shuangbao Wang
- School of Physical Science and Technology, Guangxi University, Nanning 530004, China
| | - Langli Luo
- Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, P. R. China
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59
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Wang J, Ma Y, Mahapatra M, Kang J, Senanayake SD, Tong X, Stacchiola DJ, White MG. Surface structure of mass-selected niobium oxide nanoclusters on Au(111). NANOTECHNOLOGY 2021; 32:475601. [PMID: 34380123 DOI: 10.1088/1361-6528/ac1cc0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 08/10/2021] [Indexed: 06/13/2023]
Abstract
The structures formed by the deposition of mass-selected niobium oxide clusters, Nb3Oy(y = 5, 6, 7), onto Au(111) were studied by scanning tunneling microscopy. The as-deposited Nb3O7clusters assemble into large dendritic structures that grow on the terraces as well as extend from the top and bottom of step edges. The Nb3O6cluster also forms dendritic assemblies but they are generally much smaller in size. The assemblies are composed of smaller discrete structures (<1 nm) which are likely to be single clusters. The dendritic assemblies for both the Nb3O7and Nb3O6clusters have fractal dimensions of about 1.7 which is very close to that expected for simple diffusion limited aggregation. Annealing the Nb3O7,6/Au(111) surfaces up to 550 K results in changes in assembly sizes and increases in heights, while heating to 700 results in the disruption of the assemblies into smaller structures. By contrast, the as-deposited Nb3O5/Au(111) surface at RT exhibits compact cluster structures which become 3D nanoparticles when annealed above 550 K. Differences in the observed surface structures and thermal stability are attributed to differences in metal-oxygen stoichiometry which can influence cluster binding energies, mobility and inter-cluster interactions.
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Affiliation(s)
- Jason Wang
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Yilin Ma
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Mausumi Mahapatra
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Jindong Kang
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
| | - Sanjaya D Senanayake
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Xiao Tong
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Dario J Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton 11973 NY, United States of America
| | - Michael G White
- Department of Chemistry, Stony Brook University, Stony Brook 11794 NY, United States of America
- Chemistry Division, Brookhaven National Laboratory, Upton 11973 NY, United States of America
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60
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Shen K, Paige JM, Kwon O, Gorte RJ, Vohs JM. Thermodynamic Properties of Iron Oxide Thin-Film Oxygen Carriers Prepared by Atomic Layer Deposition. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Kai Shen
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Julian M. Paige
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Ohhun Kwon
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Raymond J. Gorte
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - John M. Vohs
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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61
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Joshi N, Sivachandiran L. Exploring the feasibility of liquid fuel synthesis from CO 2 under cold plasma discharge: role of plasma discharge in binary metal oxide surface modification. RSC Adv 2021; 11:27757-27766. [PMID: 35480660 PMCID: PMC9037809 DOI: 10.1039/d1ra04852j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 07/19/2021] [Indexed: 12/04/2022] Open
Abstract
The conversion of CO2 to CH3OH over binary mixed metal oxides of NiO–Fe2O3 is investigated in the study. A series of catalysts, i.e., NiO, Fe2O3, 5% NiO–Fe2O3 (5NF), 10% NiO–Fe2O3 (10NF), and 15% NiO–Fe2O3 (15NF), was tested for CO2 conversion and CH3OH selectivity performance. The results show that binary mixed metal oxides are more active in comparison to pure metal oxides. Moreover, increasing NiO mixing leads to the agglomeration of NiO particles. At 200 °C, around 1.5%, 2%, and 3.2% CO2 conversion is achieved for 5NF, 10NF, and 15NF, respectively. Interestingly, when cold plasma was ignited at 200 °C, around 5.4%, 6.2%, and 10.2% CO2 conversion was achieved for the 5NF, 10NF, and 15NF catalysts, respectively. 15NF exhibited the highest CO2 conversion, but produced only CH4. Plasma coupling with the catalyst led to an increase in the CH3OH yield, and around an 5.8-fold enhancement was achieved with 10NF at 200 °C compared to thermal catalysis. We showed that the combination of plasma and thermal heating brings about significant changes to the catalyst morphology, which significantly improved the catalytic activity. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization revealed that plasma treatment leads to the formation of a mixture of spinel compounds (NiO–Fe2O3, NiFe2O4, and Fe3O4). Mechanistic understanding of CO2 conversion to CH3OH over binary mixed metal oxides of NiO–Fe2O3.![]()
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Affiliation(s)
- Nitesh Joshi
- Laboratory of Plasma Chemistry and Physics (LPCP), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology SRM Nagar, Kattankulathur Chennai-603203 India
| | - L Sivachandiran
- Laboratory of Plasma Chemistry and Physics (LPCP), Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology SRM Nagar, Kattankulathur Chennai-603203 India
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62
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Raghav H, Siva Kumar Konathala L, Mishra N, Joshi B, Goyal R, Agrawal A, Sarkar B. Fe-decorated hierarchical molybdenum carbide for direct conversion of CO2 into ethylene: Tailoring activity and stability. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101607] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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63
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Chen L, Unocic RR, Hoffman AS, Hong J, Braga AH, Bao Z, Bare SR, Szanyi J. Unlocking the Catalytic Potential of TiO 2-Supported Pt Single Atoms for the Reverse Water-Gas Shift Reaction by Altering Their Chemical Environment. JACS AU 2021; 1:977-986. [PMID: 34467344 PMCID: PMC8395703 DOI: 10.1021/jacsau.1c00111] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Indexed: 05/05/2023]
Abstract
Single-atom catalysts (SACs) often exhibit dynamic responses to the reaction and pretreatment environment that affect their activity. The lack of understanding of these behaviors hinders the development of effective, stable SACs, and makes their investigations rather difficult. Here we report a reduction-oxidation cycle that induces nearly 5-fold activity enhancement on Pt/TiO2 SACs for the reverse water-gas shift (rWGS) reaction. We combine microscopy (STEM) and spectroscopy (XAS and IR) studies with kinetic measurements, to convincingly show that the low activity on the fresh SAC is a result of limited accessibility of Pt single atoms (Pt1) due to high Pt-O coordination. The reduction step mobilizes Pt1, forming small, amorphous, and unstable Pt aggregates. The reoxidation step redisperses Pt into Pt1, but in a new, less O-coordinated chemical environment that makes the single metal atoms more accessible and, consequently, more active. After the cycle, the SAC exhibits superior rWGS activity to nonatomically dispersed Pt/TiO2. During the rWGS, the activated Pt1 experience slow deactivation, but can be reactivated by mild oxidation. This work demonstrates a clear picture of how the structural evolution of Pt/TiO2 SACs leads to ultimate catalytic efficiency, offering desired understanding on the rarely explored dynamic chemical environment of supported single metal atoms and its catalytic consequences.
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Affiliation(s)
- Linxiao Chen
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99352, United States
| | - Raymond R. Unocic
- Center
for Nanophase Materials Science, Oak Ridge
National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Adam S. Hoffman
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Jiyun Hong
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Adriano H. Braga
- Institute
of Chemistry, University of São Paulo, São Paulo, São
Paulo 05508-000, Brazil
| | - Zhenghong Bao
- Chemical
Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Simon R. Bare
- Stanford
Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Janos Szanyi
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99352, United States
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64
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Zhang Z, Chen X, Kang J, Yu Z, Tian J, Gong Z, Jia A, You R, Qian K, He S, Teng B, Cui Y, Wang Y, Zhang W, Huang W. The active sites of Cu-ZnO catalysts for water gas shift and CO hydrogenation reactions. Nat Commun 2021; 12:4331. [PMID: 34267215 PMCID: PMC8282834 DOI: 10.1038/s41467-021-24621-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 06/15/2021] [Indexed: 11/21/2022] Open
Abstract
Cu–ZnO–Al2O3 catalysts are used as the industrial catalysts for water gas shift (WGS) and CO hydrogenation to methanol reactions. Herein, via a comprehensive experimental and theoretical calculation study of a series of ZnO/Cu nanocrystals inverse catalysts with well-defined Cu structures, we report that the ZnO–Cu catalysts undergo Cu structure-dependent and reaction-sensitive in situ restructuring during WGS and CO hydrogenation reactions under typical reaction conditions, forming the active sites of CuCu(100)-hydroxylated ZnO ensemble and CuCu(611)Zn alloy, respectively. These results provide insights into the active sites of Cu–ZnO catalysts for the WGS and CO hydrogenation reactions and reveal the Cu structural effects, and offer the feasible guideline for optimizing the structures of Cu–ZnO–Al2O3 catalysts. Identification of active sites of a catalyst is the Holy Grail in heterogeneous catalysis. Here, the authors successfully identify the CuCu(100)- hydroxylated ZnO ensemble and CuCu(611)Zn alloy as the active sites of Cu-ZnO catalysts for water gas shift and CO hydrogenation reactions, respectively.
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Affiliation(s)
- Zhenhua Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China.,Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, China
| | - Xuanye Chen
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China
| | - Jincan Kang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
| | - Zongyou Yu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China
| | - Jie Tian
- Engineering and Materials Science Experiment Center, University of Science and Technology of China, Hefei, China
| | - Zhongmiao Gong
- Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China
| | - Aiping Jia
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China.,Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, China
| | - Rui You
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China
| | - Kun Qian
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China
| | - Shun He
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
| | - Botao Teng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, China
| | - Yi Cui
- Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, China
| | - Ye Wang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
| | - Wenhua Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China.
| | - Weixin Huang
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, China. .,Dalian National Laboratory for Clean Energy, Dalian, China.
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65
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Platero F, López‐Martín A, Caballero A, Colón G. Mechanistic Considerations on the H
2
Production by Methanol Thermal‐assisted Photocatalytic Reforming over Cu/TiO
2
Catalyst. ChemCatChem 2021. [DOI: 10.1002/cctc.202100680] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Francisco Platero
- Instituto de Ciencia de Materiales de Sevilla Centro Mixto Universidad de Sevilla-CSIC Américo Vespucio s/n. 41092 Sevilla Spain
| | - Angeles López‐Martín
- Instituto de Ciencia de Materiales de Sevilla Centro Mixto Universidad de Sevilla-CSIC Américo Vespucio s/n. 41092 Sevilla Spain
| | - Alfonso Caballero
- Instituto de Ciencia de Materiales de Sevilla Centro Mixto Universidad de Sevilla-CSIC Américo Vespucio s/n. 41092 Sevilla Spain
| | - Gerardo Colón
- Instituto de Ciencia de Materiales de Sevilla Centro Mixto Universidad de Sevilla-CSIC Américo Vespucio s/n. 41092 Sevilla Spain
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66
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Cortazar M, Santamaria L, Lopez G, Alvarez J, Amutio M, Bilbao J, Olazar M. Fe/olivine as primary catalyst in the biomass steam gasification in a fountain confined spouted bed reactor. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.04.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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67
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Enhanced catalytic performance of Ce-MCM-41-supported Rh for CO oxidation. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-021-04436-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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68
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Sharna S, Bahri M, Bouillet C, Rouchon V, Lambert A, Gay AS, Chiche D, Ersen O. In situ STEM study on the morphological evolution of copper-based nanoparticles during high-temperature redox reactions. NANOSCALE 2021; 13:9747-9756. [PMID: 34019612 DOI: 10.1039/d1nr01648b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Despite the broad relevance of copper nanoparticles in industrial applications, the fundamental understanding of oxidation and reduction of copper at the nanoscale is still a matter of debate and remains within the realm of bulk or thin film-based systems. Moreover, the reported studies on nanoparticles vary widely in terms of experimental parameters and are predominantly carried out using either ex situ observation or environmental transmission electron microscopy in a gaseous atmosphere at low pressure. Hence, dedicated studies in regards to the morphological transformations and structural transitions of copper-based nanoparticles at a wider range of temperatures and under industrially relevant pressure would provide valuable insights to improve the application-specific material design. In this paper, copper nanoparticles are studied using in situ Scanning Transmission Electron Microscopy to discern the transformation of the nanoparticles induced by oxidative and reductive environments at high temperatures. The nanoparticles were subjected to a temperature of 150 °C to 900 °C at 0.5 atm partial pressure of the reactive gas, which resulted in different modes of copper mobility both within the individual nanoparticles and on the surface of the support. Oxidation at an incremental temperature revealed the dependency of the nanoparticles' morphological evolution on their initial size as well as reaction temperature. After the formation of an initial thin layer of oxide, the nanoparticles evolved to form hollow oxide shells. The kinetics of formation of hollow particles were simulated using a reaction-diffusion model to determine the activation energy of diffusion and temperature-dependent diffusion coefficient of copper in copper oxide. Upon further temperature increase, the hollow shell collapsed to form compact and facetted nanoparticles. Reduction of copper oxide was carried out at different temperatures starting from various oxide phase morphologies. A reduction mechanism is proposed based on the dynamic of the reduction-induced fragmentation of the oxide phase. In a broader perspective, this study offers insights into the mobility of the copper phase during its oxidation-reduction process in terms of microstructural evolution as a function of nanoparticle size, reaction gas, and temperature.
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Affiliation(s)
- Sharmin Sharna
- IFP Energies Nouvelles, Rond-Point de l'échangeur de Solaize, 69360 Solaize, France
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69
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Stolte N, Yu J, Chen Z, Sverjensky DA, Pan D. Water-Gas Shift Reaction Produces Formate at Extreme Pressures and Temperatures in Deep Earth Fluids. J Phys Chem Lett 2021; 12:4292-4298. [PMID: 33928781 DOI: 10.1021/acs.jpclett.1c00563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The water-gas shift reaction is one of the most important reactions in industrial hydrogen production and plays a key role in Fischer-Tropsch-type synthesis, which is widely believed to generate hydrocarbons in the deep carbon cycle but is little known at extreme pressure-temperature conditions found in the Earth's upper mantle. Here, we performed extensive ab initio molecular dynamics simulations and free energy calculations to study the water-gas shift reaction. We found the direct formation of formic acid from CO and supercritical water at 10-13 GPa and 1400 K without any catalyst. Contrary to the common assumption that formic acid or formate is an intermediate product, we found that HCOOH is thermodynamically more stable than the products of the water-gas shift reaction above 3 GPa and at 1000-1400 K. Our study suggests that the water-gas shift reaction may not happen in the Earth's upper mantle, and formic acid or formate may be an important carbon carrier in reducing environments, participating in many geochemical processes in deep Earth.
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Affiliation(s)
- Nore Stolte
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Junting Yu
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Zixin Chen
- Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Dimitri A Sverjensky
- Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Ding Pan
- Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- Department of Chemistry, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- HKUST Fok Ying Tung Research Institute, No. 2 Huan Shi Da Dao Road, Nansha District, Guangzhou City, 511458, China
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70
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Chung CH, Tu FY, Chiu TA, Wu TT, Yu WY. Critical Roles of Surface Oxygen Vacancy in Heterogeneous Catalysis over Ceria-based Materials: A Selected Review. CHEM LETT 2021. [DOI: 10.1246/cl.200845] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ching-Hsiu Chung
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, Taipei 10617, Taiwan
| | - Fang-Yi Tu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, Taipei 10617, Taiwan
| | - Te-An Chiu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, Taipei 10617, Taiwan
| | - Tung-Ta Wu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, Taipei 10617, Taiwan
| | - Wen-Yueh Yu
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
- Advanced Research Center for Green Materials Science and Technology, Taipei 10617, Taiwan
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71
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Tian H, He Y, Zhao Q, Li J, Shao X, Zhang Z, Huang X, Lu C, Wang K, Jiang Q, Ng A, Xu H, Tong S. Avoiding Sabatier’s conflict in bifunctional heterogeneous catalysts for the WGS reaction. Chem 2021. [DOI: 10.1016/j.chempr.2021.01.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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72
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Catlow CRA. Concluding remarks: Reaction mechanisms in catalysis: perspectives and prospects. Faraday Discuss 2021; 229:502-513. [PMID: 33928335 DOI: 10.1039/d1fd00027f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We consider the current status of our understanding of reaction mechanisms in catalysis in the light of the papers presented in this Discussion. We identify some of the challenges in both theoretical and experimental studies, which we illustrate by considering three key reactions.
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Affiliation(s)
- C Richard A Catlow
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Park Place, Cardiff, CF10 1AT, UK. and Department of Chemistry, University College London, 20 Gordon St., London, WC1H 0AJ, UK and UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, Oxon OX11 0FA, UK
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Sun L, Xu J, Liu X, Qiao B, Li L, Ren Y, Wan Q, Lin J, Lin S, Wang X, Guo H, Zhang T. High-Efficiency Water Gas Shift Reaction Catalysis on α-MoC Promoted by Single-Atom Ir Species. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00231] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Li Sun
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Junkang Xu
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Xiaoyan Liu
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Botao Qiao
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Lin Li
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Yujing Ren
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Qiang Wan
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Jian Lin
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Sen Lin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China
| | - Xiaodong Wang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Tao Zhang
- CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
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Abstract
Certain alkali metals (Na, K) at targeted loadings have been shown in recent decades to significantly promote the LT-WGS reaction. This occurs at alkali doping levels where a redshift in the C-H band of formate occurs, indicating electronic weakening of the bond. The C-H bond breaking of formate is the proposed rate-limiting step of the formate associative mechanism, lending support to the occurrence of this mechanism in H2-rich environments of the LT-WGS stage of fuel processors. Continuing in this vein of research, 2%Pt/m-ZrO2 was promoted with various levels of Cs in order to explore its influence on the rate of formate intermediate decomposition, as well as that of LT-WGS in a fixed bed reactor. In situ DRIFTS experiments revealed that Cs promoter loadings of 3.87% to 7.22% resulted in significant acceleration of the forward formate decomposition in steam at 130 °C. Of all of the alkali metals tested to date, the redshift in the formate ν(CH) band with the incorporation of Cs was the greatest. XANES difference experiments at the Pt L2 and L3 edges indicated that the electronic effect was not likely due to an enrichment of electronic density on Pt. CO2 TPD experiments revealed that, unlike Na and K promoters, Cs behaves more like Rb in that the decomposition of the second intermediate in LT-WGS, carbonate species, is hindered due to (1) increased basicity of Cs, (2) the tendency of Cs to cover Pt sites that facilitate CO2 decomposition, and (3) the tendency of Cs to increase Pt particle size as shown by EXAFS results, resulting in fewer Pt sites that facilitate CO2 decomposition. As such, the LT-WGS rate was hindered overall and the rate-limiting step shifted to carbonate decomposition (CO2 removal). Like its Rb counterpart, low levels of added Cs (e.g., 0.72%Cs) were found to improve the stability of the catalyst relative to the unpromoted catalyst; the stability comparison was made at similar CO conversion level as well as similar space velocity.
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Abstract
The synthesis of methanol from biomass-derived syngas can be challenging because of the high CO2 content in the bio-syngas, resulting in lower kinetics and higher catalyst deactivation. This work explores the in situ pre-treatment of a CO2-rich syngas with a CO2/CO ratio equal to 1.9 through the reverse-water gas shift reaction with the aim of adjusting this ratio to a more favorable one for the synthesis of methanol with Cu-based catalysts. Both reactions take place in two catalytic beds placed in the same reactor, thus intensifying the methanol process. The water produced during syngas conditioning is removed by means of a sorbent zeolite to prevent the methanol catalyst deactivation and to shift the equilibrium towards the methanol formation. The combination of the CO2 shifting and the water sorption strategies lead to higher productivities of the catalytic bed and, under certain reaction conditions, to higher methanol productions.
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76
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Rao Z, Cao Y, Huang Z, Yin Z, Wan W, Ma M, Wu Y, Wang J, Yang G, Cui Y, Gong Z, Zhou Y. Insights into the Nonthermal Effects of Light in Dry Reforming of Methane to Enhance the H 2/CO Ratio Near Unity over Ni/Ga 2O 3. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04826] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhiqiang Rao
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Yuehan Cao
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Zeai Huang
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Zihang Yin
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Wenchao Wan
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Minzhi Ma
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Yanxin Wu
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Junbu Wang
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
| | - Guidong Yang
- XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yi Cui
- Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Zhongmiao Gong
- Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Ying Zhou
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
- School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
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77
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Zhu Y, Yuk SF, Zheng J, Nguyen MT, Lee MS, Szanyi J, Kovarik L, Zhu Z, Balasubramanian M, Glezakou VA, Fulton JL, Lercher JA, Rousseau R, Gutiérrez OY. Environment of Metal–O–Fe Bonds Enabling High Activity in CO2 Reduction on Single Metal Atoms and on Supported Nanoparticles. J Am Chem Soc 2021; 143:5540-5549. [DOI: 10.1021/jacs.1c02276] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yifeng Zhu
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Simuck F. Yuk
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Jian Zheng
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Manh-Thuong Nguyen
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Mal-Soon Lee
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Janos Szanyi
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Libor Kovarik
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Zihua Zhu
- William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | | | - Vassiliki-Alexandra Glezakou
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - John L. Fulton
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Johannes A. Lercher
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Roger Rousseau
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Oliver Y. Gutiérrez
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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Abstract
Methane, discovered in 1766 by Alessandro Volta, is an attractive energy source because of its high heat of combustion per mole of carbon dioxide. However, methane is the most abundant hydrocarbon in the atmosphere and is an important greenhouse gas, with a 21-fold greater relative radiative effectiveness than CO2 on a per-molecule basis. To avoid or limit the formation of pollutants that are dangerous for both human health and the atmospheric environment, the catalytic combustion of methane appears to be one of the most promising alternatives to thermal combustion. Total oxidation of methane, which is environmentally friendly at much lower temperatures, is believed to be an efficient and economically feasible way to eliminate pollutants. This work presents a literature review, a statu quo, on catalytic methane oxidation on transition metal oxide-modified ceria catalysts (MOx/CeO2). Methane was used for this study since it is of great interest as a model compound for understanding the mechanisms of oxidation and catalytic combustion on metal oxides. The objective was to evaluate the conceptual ideas of oxygen vacancy formation through doping to increase the catalytic activity for methane oxidation over CeO2. Oxygen vacancies were created through the formation of solid solutions, and their catalytic activities were compared to the catalytic activity of an undoped CeO2 sample. The reaction conditions, the type of catalysts, the morphology and crystallographic facets exposing the role of oxygen vacancies, the deactivation mechanism, the stability of the catalysts, the reaction mechanism and kinetic characteristics are summarized.
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80
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A Microwave-Assisted Boudouard Reaction: A Highly Effective Reduction of the Greenhouse Gas CO 2 to Useful CO Feedstock with Semi-Coke. Molecules 2021; 26:molecules26061507. [PMID: 33802069 PMCID: PMC8001657 DOI: 10.3390/molecules26061507] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/03/2021] [Accepted: 03/03/2021] [Indexed: 11/20/2022] Open
Abstract
The conversion of CO2 into more synthetically flexible CO is an effective and potential method for CO2 remediation, utilization and carbon emission reduction. In this paper, the reaction of carbon-carbon dioxide (the Boudouard reaction) was performed in a microwave fixed bed reactor using semi-coke (SC) as both the microwave absorber and reactant and was systematically compared with that heated in a conventional thermal field. The effects of the heating source, SC particle size, CO2 flow rate and additives on CO2 conversion and CO output were investigated. By microwave heating (MWH), CO2 conversion reached more than 99% while by conventional heating (CH), the maximum conversion of CO2 was approximately 29% at 900 °C. Meanwhile, for the reaction with 5 wt% barium carbonate added as a promoter, the reaction temperature was significantly reduced to 750 °C with an almost quantitative conversion of CO2. Further kinetic calculations showed that the apparent activation energy of the reaction under microwave heating was 46.3 kJ/mol, which was only one-third of that observed under conventional heating. The microwave-assisted Boudouard reaction with catalytic barium carbonate is a promising method for carbon dioxide utilization.
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López Cámara A, Cortés Corberán V, Martínez-Arias A. Inverse CeO2/CuO WGS catalysts: Influence of the presence of oxygen in the reactant mixture. Catal Today 2021. [DOI: 10.1016/j.cattod.2019.09.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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82
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Lee J, Li C, Kang S, Park J, Kim JM, Kim DH. Pt nanoparticles encapsulated in CeO2 over-layers synthesized by controlled reductive treatment to suppress CH4 formation in high-temperature water-gas shift reaction. J Catal 2021. [DOI: 10.1016/j.jcat.2021.01.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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83
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Ziemba M, Ganduglia-Pirovano MV, Hess C. Insight into the mechanism of the water-gas shift reaction over Au/CeO 2 catalysts using combined operando spectroscopies. Faraday Discuss 2021; 229:232-250. [PMID: 33634801 DOI: 10.1039/c9fd00133f] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of the low-temperature water-gas shift (LT-WGS) reaction over Au/CeO2 catalysts with different ceria terminations, i.e., (111), (110), and (100) facets, was investigated. Using combined operando Raman and UV-Vis spectroscopy as well as isotope exchange experiments, we are able to draw conclusions about the reducibility behaviour and the exchange of surface oxygen. Additional density functional theory (DFT) calculations facilitate the vibrational bands assignments and enhance the interpretation of the results on a molecular level. A facet-dependent role of gold is observed with respect to the oxygen dynamics, since for the CeO2(111) facet the presence of gold is required to exchange surface oxygen, whereas the CeO2(110) facet requires no gold, as rationalized by the low defect formation energy of this facet. This behaviour suggests that surface properties (termination, stepped surface) may have a strong effect on the reactivity. While the reduction of the support accompanies the reaction, its extent does not directly correlate with activity, highlighting the importance of other properties, such as the dissociative adsorption of water and/or CO2/H2 desorption. The results of our facet-dependent study are consistent with a redox mechanism, as underlined by H218O isotopic exchange experiments demonstrating the ready exchange of surface oxygen.
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Affiliation(s)
- Marc Ziemba
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany.
| | - M Verónica Ganduglia-Pirovano
- Instituto de Catálisis y Petroleoquímica - Consejo Superior de Investigaciones Científicas, Marie Curie 2, 28049 Madrid, Spain
| | - Christian Hess
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, 64287 Darmstadt, Germany.
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84
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Low Temperature Water-Gas Shift: Enhancing Stability through Optimizing Rb Loading on Pt/ZrO2. Catalysts 2021. [DOI: 10.3390/catal11020210] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Recent studies have shown that appropriate levels of alkali promotion can significantly improve the rate of low-temperature water gas shift (LT-WGS) on a range of catalysts. At sufficient loadings, the alkali metal can weaken the formate C–H bond and promote formate dehydrogenation, which is the proposed rate determining step in the formate associative mechanism. In a continuation of these studies, the effect of Rb promotion on Pt/ZrO2 is examined herein. Pt/ZrO2 catalysts were prepared with several different Rb loadings and characterized using temperature programmed reduction mass spectrometry (TPR-MS), temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), an X-ray absorption near edge spectroscopy (XANES) difference procedure, extended X-ray absorption fine structure spectroscopy (EXAFS) fitting, TPR-EXAFS/XANES, and reactor testing. At loadings of 2.79% Rb or higher, a significant shift was seen in the formate ν(CH) band. The results showed that a Rb loading of 4.65%, significantly improves the rate of formate decomposition in the presence of steam via weakening the formate C–H bond. However, excessive rubidium loading led to the increase in stability of a second intermediate, carbonate and inhibited hydrogen transfer reactions on Pt through surface blocking and accelerated agglomeration during catalyst activation. Optimal catalytic performance was achieved with loadings in the range of 0.55–0.93% Rb, where the catalyst maintained high activity and exhibited higher stability in comparison with the unpromoted catalyst.
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Improved Water-Gas Shift Performance of Au/NiAl LDHs Nanostructured Catalysts via CeO 2 Addition. NANOMATERIALS 2021; 11:nano11020366. [PMID: 33540532 PMCID: PMC7912797 DOI: 10.3390/nano11020366] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 01/22/2021] [Accepted: 01/25/2021] [Indexed: 01/17/2023]
Abstract
Supported gold on co-precipitated nanosized NiAl layered double hydroxides (LDHs) was studied as an effective catalyst for medium-temperature water–gas shift (WGS) reaction, an industrial catalytic process traditionally applied for the reduction in the amount of CO in the synthesis gas and production of pure hydrogen. The motivation of the present study was to improve the performance of the Au/NiAl catalyst via modification by CeO2. An innovative approach for the direct deposition of ceria (1, 3 or 5 wt.%) on NiAl-LDH, based on the precipitation of Ce3+ ions with 1M NaOH, was developed. The proposed method allows us to obtain the CeO2 phase and to preserve the NiAl layered structure by avoiding the calcination treatment. The synthesis of Au-containing samples was performed through the deposition–precipitation method. The as-prepared and WGS-tested samples were characterized by X-ray powder diffraction, N2-physisorption and X-ray photoelectron spectroscopy in order to clarify the effects of Au and CeO2 loading on the structure, phase composition, textural and electronic properties and activity of the catalysts. The reduction behavior of the studied samples was evaluated by temperature-programmed reduction. The WGS performance of Au/NiAl catalysts was significantly affected by the addition of CeO2. A favorable role of ceria was revealed by comparison of CO conversion degree at 220 °C reached by 3 wt.% CeO2-modified and ceria-free Au/NiAl samples (98.8 and 83.4%, respectively). It can be stated that tuning the properties of Au/NiAl LDH via CeO2 addition offers catalysts with possibilities for practical application owing to innovative synthesis and improved WGS performance.
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86
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Göbel C, Schmidt S, Froese C, Bujara T, Viktor Scherer, Muhler M. The steady-state kinetics of CO hydrogenation to higher alcohols over a bulk Co-Cu catalyst. J Catal 2021. [DOI: 10.1016/j.jcat.2020.10.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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87
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Biomass gasification in a downdraft fixed-bed gasifier: Optimization of operating conditions. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116249] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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88
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Li N, Li Z, Wang N, Yu J, Yang Y. Addition of Sodium Additives for Improved Performance of Water-Gas Shift Reaction over Ni-Based Catalysts. ACS OMEGA 2021; 6:2346-2353. [PMID: 33521473 PMCID: PMC7841924 DOI: 10.1021/acsomega.0c05677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 01/05/2021] [Indexed: 06/12/2023]
Abstract
The effect of Na loading on water-gas shift reaction (WGSR) activity of Ni@TiO x -XNa (X = 0, 0.5, 1, 2, and 5 wt %) catalysts has been investigated. Herein, we report sodium-modified Ni@TiO x catalysts (denoted as Ni@TiO x -XNa) derived from Ni3Ti1-layered double hydroxide (Ni3Ti1-LDH) precursor. The optimized Ni@TiO x -1Na catalyst exhibits enhanced catalytic performance toward WGSR at relatively low temperature and reaches an equilibrium CO conversion at 300 °C, which is much superior to those for most of the reported Ni-based catalysts. The H2-temperature-programmed reduction (H2-TPR) result demonstrates that the Ni@TiO x -1Na catalyst has a stronger metal-support interaction (MSI) than the sodium-free Ni@TiO x catalyst. The presence of stronger MSI significantly facilitates the electron transfer from TiO x support to the interfacial Ni atoms to modulate the electronic structure of Ni atoms (a sharp increase in Niδ- species), inducing the generation of more surface sites (Ov-Ti3+) accompanied by more interfacial sites (Niδ--Ov-Ti3+), revealed by X-ray photoelectron spectroscopy (XPS). The Niδ--Ov-Ti3+ interfacial sites serve as dual-active sites for WGSR. The increase in the dual-active sites accounts for improvement in the catalytic performance of WGSR. With the tunable Ni-TiO x interaction, a feasible strategy in creating active sites by adding low-cost sodium addictive has been developed.
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Affiliation(s)
- Na Li
- Stated
Grid Integrated Energy Service Group Co., Ltd., Beijing 100052, P. R. China
| | - Zhiyuan Li
- Stated
Grid Integrated Energy Service Group Co., Ltd., Beijing 100052, P. R. China
| | - Nan Wang
- Stated
Grid Integrated Energy Service Group Co., Ltd., Beijing 100052, P. R. China
| | - Jun Yu
- State
Key Laboratory of Chemical Resource Engineering, Beijing Advanced
Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Yusen Yang
- State
Key Laboratory of Chemical Resource Engineering, Beijing Advanced
Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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89
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Lyu Z, Chen R, Mavrikakis M, Xia Y. Physical Transformations of Noble-Metal Nanocrystals upon Thermal Activation. Acc Chem Res 2021; 54:1-10. [PMID: 33275422 DOI: 10.1021/acs.accounts.0c00640] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
ConspectusThe last two decades have witnessed the successful development of noble-metal nanocrystals with well-controlled properties for a variety of applications in catalysis, plasmonics, electronics, and biomedicine. Most of these nanocrystals are kinetically controlled products greatly deviated from the equilibrium state defined by thermodynamics. When subjected to elevated temperatures, their arrangements of atoms are expected to undergo various physical transformations, inducing changes to the shape, morphology (hollow vs solid), spatial distribution of elements (segregated vs alloyed/intermetallic), internal structure (twinned vs single-crystal), and crystal phase. In order to optimize the performance of these nanocrystals in various applications, there is a pressing need to understand and improve their thermal stability.By integrating in situ heating with transmission electron microscopy or X-ray diffraction, we have investigated the physical transformations of various types of noble-metal nanocrystals in real time. We have also explored the atomistic detail responsible for a physical transformation using first-principles calculations, providing insightful guidance for the development of noble-metal nanocrystals with augmented thermal stability. Specifically, solid nanocrystals were observed to transform into pseudospherical particles favored by thermodynamics by reducing the surface area while eliminating the facets high in surface energy. For nanocrystals of relatively large in size, a single-crystal lattice was more favorable than a twinned structure. When switching to core-shell nanocrystals, the elevation in temperature caused changes to the elemental distribution in addition to shape transformation. The compositional stability of a core-shell nanocrystal was found to be strongly dependent on the shape and thus the type of facet expressed on the surface. For hollow nanocrystals such as nanocages and nanoframes, their thermal stabilities were typically inferior to the solid counterparts, albeit their unique structure and large specific surface area are highly desired in applications such as catalysis. When a metastable crystal structure was involved, phase transition was also observed at a temperature close to that responsible for shape or compositional change. We hope the principles, methodologies, and mechanistic insights presented in this Account will help the readers achieve a good understanding of the physical transformations that are expected to take place in noble-metal nanocrystals when they are subjected to thermal activation. Such an understanding may eventually lead to the development of effective methods for retarding or even preventing some of the transformations.
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Affiliation(s)
- Zhiheng Lyu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ruhui Chen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Manos Mavrikakis
- Department of Chemical and Biological Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Younan Xia
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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90
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91
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Lu F, Chen X, Wang W, Zhang Y. Adjusting the CO 2 hydrogenation pathway via the synergic effects of iron carbides and iron oxides. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01758f] [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
The synergic effects of iron carbides and iron oxides were used to adjust the reaction pathway to form alkenes or ethanol.
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Affiliation(s)
- Fangxu Lu
- College of Chemical Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, PR China
| | - Xin Chen
- College of Chemical Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, PR China
| | - Wen Wang
- College of Chemical Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, PR China
| | - Yi Zhang
- College of Chemical Engineering, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Beijing 100029, PR China
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92
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Enhanced NO, CO and C3H6 conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.01.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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93
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Park YM, Cho JM, Han GY, Bae JW. Roles of highly ordered mesoporous structures of Fe–Ni bimetal oxides for an enhanced high-temperature water-gas shift reaction activity. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00164g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly ordered mesoporous Fe–Ni bimetal oxide (m-FeNi) catalysts synthesized using KIT-6 as a hard-template by a nanocasting method were investigated for an alternative high-temperature water-gas shift (HT-WGS) reaction.
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Affiliation(s)
- Yong Min Park
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon
- Republic of Korea
| | - Jae Min Cho
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon
- Republic of Korea
| | - Gui Young Han
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon
- Republic of Korea
| | - Jong Wook Bae
- School of Chemical Engineering
- Sungkyunkwan University (SKKU)
- Suwon
- Republic of Korea
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94
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Gao XQ, Song W, Li WC, Lu AH. Anti-coke behavior of an alumina nanosheet supported Pt–Sn catalyst for isobutane dehydrogenation. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02154g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alumina nanosheet supported platinum-based catalysts exhibited excellent catalytic reactivity and stability with an anti-coke capacity in the isobutane dehydrogenation process due to the abundant defect sites and decreased acidity.
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Affiliation(s)
- Xin-Qian Gao
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Wei Song
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
- PR China
| | - Wen-Cui Li
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
- PR China
| | - An-Hui Lu
- State Key Laboratory of Fine Chemicals
- School of Chemical Engineering
- Dalian University of Technology
- Dalian 116024
- PR China
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95
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González-Castaño M, Dorneanu B, Arellano-García H. The reverse water gas shift reaction: a process systems engineering perspective. REACT CHEM ENG 2021. [DOI: 10.1039/d0re00478b] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
RWGS reaction thermodynamics, mechanisms and kinetics. Process design and process intensification – from lab scale to industrial applications and CO2 value chains. Pathways for further improvement of catalytic systems, reactor and process design.
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Affiliation(s)
- Miriam González-Castaño
- Department of Process and Plant Technology
- Brandenburg University of Technology (BTU) Cottbus-Senftenberg
- Cottbus
- Germany
| | - Bogdan Dorneanu
- Department of Process and Plant Technology
- Brandenburg University of Technology (BTU) Cottbus-Senftenberg
- Cottbus
- Germany
| | - Harvey Arellano-García
- Department of Process and Plant Technology
- Brandenburg University of Technology (BTU) Cottbus-Senftenberg
- Cottbus
- Germany
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96
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Bilanin C, Tiburcio E, Ferrando‐Soria J, Armentano D, Leyva‐Pérez A, Pardo E. Crystallographic Visualization of a Double Water Molecule Addition on a Pt
1
‐MOF during the Low‐temperature Water‐Gas Shift Reaction. ChemCatChem 2020. [DOI: 10.1002/cctc.202001492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Cristina Bilanin
- Instituto de Tecnología Química Universidad Politècnica de València-Consejo Superior de Investigaciones Científicas. 46022 València Spain
| | - Estefanía Tiburcio
- Instituto de Ciencia Molecular (ICMol) Universidad de Valencia 46980 Paterna, València Spain
| | - Jesús Ferrando‐Soria
- Instituto de Ciencia Molecular (ICMol) Universidad de Valencia 46980 Paterna, València Spain
| | - Donatella Armentano
- Dipartimento di Chimica e Tecnologie Chimiche Università della Calabria 87030 Rende, Cosenza Italy
| | - Antonio Leyva‐Pérez
- Instituto de Tecnología Química Universidad Politècnica de València-Consejo Superior de Investigaciones Científicas. 46022 València Spain
| | - Emilio Pardo
- Instituto de Ciencia Molecular (ICMol) Universidad de Valencia 46980 Paterna, València Spain
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97
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Yu X, Roth JP, Wang J, Sauter E, Nefedov A, Heißler S, Pacchioni G, Wang Y, Wöll C. Chemical Reactivity of Supported ZnO Clusters: Undercoordinated Zinc and Oxygen Atoms as Active Sites. Chemphyschem 2020; 21:2553-2564. [PMID: 33118300 PMCID: PMC7756222 DOI: 10.1002/cphc.202000747] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 10/21/2020] [Indexed: 11/06/2022]
Abstract
The growth of ZnO clusters supported by ZnO-bilayers on Ag(111) and the interaction of these oxide nanostructures with water have been studied by a multi-technique approach combining temperature-dependent infrared reflection absorption spectroscopy (IRRAS), grazing-emission X-ray photoelectron spectroscopy, and density functional theory calculations. Our results reveal that the ZnO bilayers exhibiting graphite-like structure are chemically inactive for water dissociation, whereas small ZnO clusters formed on top of these well-defined, yet chemically passive supports show extremely high reactivity - water is dissociated without an apparent activation barrier. Systematic isotopic substitution experiments using H2 16 O/D2 16 O/D2 18 O allow identification of various types of acidic hydroxyl groups. We demonstrate that a reliable characterization of these OH-species is possible via co-adsorption of CO, which leads to a red shift of the OD frequency due to the weak interaction via hydrogen bonding. The theoretical results provide atomic-level insight into the surface structure and chemical activity of the supported ZnO clusters and allow identification of the presence of under-coordinated Zn and O atoms at the edges and corners of the ZnO clusters as the active sites for H2 O dissociation.
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Affiliation(s)
- Xiaojuan Yu
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Jannik P. Roth
- Dipartimento di Scienza dei MaterialiUniversità Milano-BicoccaVia R. Cozzi 5520125MilanoItaly
| | - Junjun Wang
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Eric Sauter
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Alexei Nefedov
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Stefan Heißler
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Gianfranco Pacchioni
- Dipartimento di Scienza dei MaterialiUniversità Milano-BicoccaVia R. Cozzi 5520125MilanoItaly
| | - Yuemin Wang
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
| | - Christof Wöll
- Institute of Functional InterfacesKarlsruhe Institute of TechnologyEggenstein-Leopoldshafen76344Germany
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98
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WGS reaction empirical kinetics over novel potassium promoted ZnAlLa mixed oxides catalyst. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.09.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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99
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Wang Q, Li K, Guo Z, Fang M, Luo Z. Effects of CO Atmosphere on the Pyrolysis of a Typical Lignite. Chem Eng Technol 2020. [DOI: 10.1002/ceat.202000273] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qinhui Wang
- Zhejiang University State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering 310027 Hangzhou China
| | - Kaikun Li
- Zhejiang University State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering 310027 Hangzhou China
| | - Zhihang Guo
- Zhejiang University State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering 310027 Hangzhou China
| | - Mengxiang Fang
- Zhejiang University State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering 310027 Hangzhou China
| | - Zhongyang Luo
- Zhejiang University State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering 310027 Hangzhou China
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100
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Mitchell GM, Sabnis KD, Sollberger FG, Cui Y, Han CW, Majumdar P, Zeng Z, Miller JT, Greeley J, Ortalan V, Wang C, Delgass WN, Ribeiro FH. Effect of cobalt addition on platinum supported on multi-walled carbon nanotubes for water-gas shift. J Catal 2020. [DOI: 10.1016/j.jcat.2020.07.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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