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Tursun M, Wu C. Single Transition Metal Atoms Anchored on Defective MoS 2 Monolayers for the Electrocatalytic Reduction of Nitric Oxide into Ammonia and Hydroxylamine. Inorg Chem 2022; 61:17448-17458. [DOI: 10.1021/acs.inorgchem.2c02247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mamutjan Tursun
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an710054, China
- College of Chemistry and Environmental Science, Kashgar University, Kashgar844000, Xinjiang, China
| | - Chao Wu
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an710054, China
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Huang X, Li H, Zhang Y, Wu R, Ban L, Xi L, Yin Z, Peng J, Zhao Y, Fang L. Enhancement of Cu + stability under a reducing atmosphere by the long-range electromagnetic effect of Au. NANOSCALE 2022; 14:13248-13260. [PMID: 36052817 DOI: 10.1039/d2nr02407a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In conventional thermocatalytic reactions under a reducing atmosphere, stabilization of the active Cu+ component and inhibition of over-reduction into metallic Cu0 are extremely challenging. In this study, Au@Cu2O core-shell nano-catalysts with different Cu2O shell thicknesses were synthesized, and the effect of the Au nano-core on Cu+ stability under a reducing atmosphere and the catalytic performance of Cu+ in the ethynylation of formaldehyde were investigated. The Au nano-core facilitates Cu2O dispersion and leads to an increase of 0.2-0.5 eV in electron binding energies of Cu2O and Cu2C2 in the range of 27-55 nm, attributed to the long-range electromagnetic effect of Au NPs. Specifically, active Cu+ centers exhibit high stability under a reducing atmosphere due to the long-range electromagnetic effect of the Au nano-core. In the ethynylation of formaldehyde as a probe reaction, Cu+/(Cu0 + Cu+) on Au@Cu2O catalysts remained at 88-91%. The catalytic performance in the ethynylation of formaldehyde revealed that the introduction of an Au nano-core into Cu-based catalysts increased the TOF from 0.37 to 0.7 h-1, and decreased the activation energy from 42.6 to 38.1 kJ mol-1. Additionally, the Cu+/(Cu0 + Cu+) ratios and the catalytic performance in the ethynylation of formaldehyde (BD yield = 65%, BD selectivity = 95%) on Au@Cu2O catalysts remained constant after nine cycles, while pure Cu2O readily deactivated due to the dramatically reduced Cu+/(Cu0 + Cu+) ratios and carbyne deposition. In summary, Cu+ in Cu-based catalysts showed high catalytic activity and stability during the ethynylation of formaldehyde due to the long-range electromagnetic effect of the Au nano-core.
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Affiliation(s)
- Xin Huang
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Haitao Li
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Yin Zhang
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Ruifang Wu
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Lijun Ban
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Lin Xi
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Zhifang Yin
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Jian Peng
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Yongxiang Zhao
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Li Fang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
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Insight into the transient inactivation effect on Au/TiO2 catalyst by in-situ DRIFT and UV–vis spectroscopy. Nat Commun 2022; 13:5458. [PMID: 36115847 PMCID: PMC9482617 DOI: 10.1038/s41467-022-33187-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 09/06/2022] [Indexed: 11/21/2022] Open
Abstract
Au catalysts have drawn broad attention for catalytic CO oxidation. However, a molecular-level understanding of the reaction mechanism on a fast time-resolved scale is still lacking. Herein, we apply in situ DRIFTS and UV-Vis spectroscopy to monitor the rapid dynamic changes during CO oxidation over Au/TiO2. A pronounced transient inactivation effect likely due to a structural change of Au/TiO2 induced by the reactants (CO and O2) is observed at the beginning of the reaction. The transient inactivation effect is affected by the ratio of CO and O2 concentrations. More importantly, during the unstable state, the electronic properties of the Au particles change, as indicated by the shift of the CO stretching vibration. UV-Vis spectroscopy corroborates the structure change of Au/TiO2 surface induced by the reactants, which leads to a weakening of the Au catalyst’s ability to be oxidized (less O2 adsorption), resulting in the transient inactivation effect. A molecular-level understanding of the Au-catalyzed CO oxidation on a fast time-resolved scale is still lacking. Here the authors monitor the rapid dynamic changes during CO oxidation over Au/TiO2 using in situ DRIFTS and UV-Vis spectroscopy, and reveal that the catalyst undergoes a surprising structural change at the beginning of the reaction.
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Wang A, Yu D, Yin H, Yuan W. Preparation of Bimetallic CuxAgy Nanoparticles and their Catalytic Performance in Hydrogenation of 4-Nitrophenol with H2 to 4-Aminophenol. Catal Letters 2022. [DOI: 10.1007/s10562-022-03946-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Wang Z, Xu K, Ruan S, He C, Zhang L, Liu F. Mesoporous Co–Mn Spinel Oxides as Efficient Catalysts for Low Temperature Propane Oxidation. Catal Letters 2021. [DOI: 10.1007/s10562-021-03839-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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