Journal
JOURNAL OF CATALYSIS
Volume 395, Issue -, Pages 315-324Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2021.01.010
Keywords
Cu-In bimetallic catalyst; CO2 hydrogenation; Reaction mechanism; Oxygen vacancy; Near ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS)
Categories
Funding
- Swiss National Science Foundation [PZ00P2_179989]
- Innosuisse-Swiss Innovation Agency
- SNSF R'EQUIP project [170736]
- China Scholarship Council [201506060156]
- Swiss National Science Foundation (SNF) [PZ00P2_179989] Funding Source: Swiss National Science Foundation (SNF)
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In this study, the chemical properties and catalytic role of indium/copper model catalysts under CO2 hydrogenation conditions were investigated using NAPXPS. It was found that the Cu-In alloy promoted the activation of CO2 on the surface of In/Cu samples, suggesting a potential for the design of advanced In-based bimetallic catalysts for CO2 hydrogenation.
Indium-based catalysts exhibit excellent performance for CO2 hydrogenation to methanol, yet their nature and chemical evolution under reaction conditions are still elusive, thus hindering an understanding of their reaction mechanism. In this work, near ambient-pressure X-ray photoelectron spectroscopy (NAPXPS) is employed to investigate the chemical properties and the catalytic role of indium/copper model catalysts under CO2 hydrogenation conditions. We found that the deposition of In on the surface of a Cu foil led to the formation of Cu-In alloy, whereas upon CO2 exposure, In was partially oxidized to In2O3-x and Cu remains metallic. Due to the presence of In2O3-x, CO2 was activated on the surface of In/Cu samples mainly in the form of carbonate. In addition, compared with the pure In foil reference, both the fraction of oxygen vacancies and the coverage density of carbonate were higher on the In/Cu samples, indicating the promotion effect of Cu-In alloy in the activation of CO2. These results reveal the evolution of the active sites of indium/copper catalysts and inspire the design of advanced In-based bimetallic catalysts for CO2 hydrogenation. (C) 2021 The Authors. Published by Elsevier Inc.
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