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Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions

[Image: see text] We studied the initial stages of Ga interaction with the Cu(001) surface and environment-induced surface transformations in an attempt to elucidate the surface chemistry of the Cu–Ga catalysts recently proposed for CO(2) hydrogenation to methanol. The results show that Ga readily i...

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Autores principales: Zhong, Jian-Qiang, Shaikhutdinov, Shamil, Roldan Cuenya, Beatriz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7830109/
https://www.ncbi.nlm.nih.gov/pubmed/33510828
http://dx.doi.org/10.1021/acs.jpcc.0c09382
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author Zhong, Jian-Qiang
Shaikhutdinov, Shamil
Roldan Cuenya, Beatriz
author_facet Zhong, Jian-Qiang
Shaikhutdinov, Shamil
Roldan Cuenya, Beatriz
author_sort Zhong, Jian-Qiang
collection PubMed
description [Image: see text] We studied the initial stages of Ga interaction with the Cu(001) surface and environment-induced surface transformations in an attempt to elucidate the surface chemistry of the Cu–Ga catalysts recently proposed for CO(2) hydrogenation to methanol. The results show that Ga readily intermixes with Cu upon deposition in vacuum. However, even traces of oxygen in the gas ambient cause Ga oxidation and the formation of two-dimensional (“monolayer”) Ga oxide islands uniformly covering the Cu surface. The surface morphology and the oxidized state of Ga remain in H(2) as well as in a CO(2) + H(2) reaction mixture at elevated pressures and temperatures (0.2 mbar, 700 K). The results indicate that the Ga-doped Cu surface under reaction conditions exposes a variety of structures including GaO(x)/Cu interfacial sites, which must be taken into account for elucidating the reaction mechanism.
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spelling pubmed-78301092021-01-26 Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions Zhong, Jian-Qiang Shaikhutdinov, Shamil Roldan Cuenya, Beatriz J Phys Chem C Nanomater Interfaces [Image: see text] We studied the initial stages of Ga interaction with the Cu(001) surface and environment-induced surface transformations in an attempt to elucidate the surface chemistry of the Cu–Ga catalysts recently proposed for CO(2) hydrogenation to methanol. The results show that Ga readily intermixes with Cu upon deposition in vacuum. However, even traces of oxygen in the gas ambient cause Ga oxidation and the formation of two-dimensional (“monolayer”) Ga oxide islands uniformly covering the Cu surface. The surface morphology and the oxidized state of Ga remain in H(2) as well as in a CO(2) + H(2) reaction mixture at elevated pressures and temperatures (0.2 mbar, 700 K). The results indicate that the Ga-doped Cu surface under reaction conditions exposes a variety of structures including GaO(x)/Cu interfacial sites, which must be taken into account for elucidating the reaction mechanism. American Chemical Society 2021-01-06 2021-01-21 /pmc/articles/PMC7830109/ /pubmed/33510828 http://dx.doi.org/10.1021/acs.jpcc.0c09382 Text en © 2021 The Authors. Published by American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
spellingShingle Zhong, Jian-Qiang
Shaikhutdinov, Shamil
Roldan Cuenya, Beatriz
Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title_full Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title_fullStr Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title_full_unstemmed Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title_short Structural Evolution of Ga–Cu Model Catalysts for CO(2) Hydrogenation Reactions
title_sort structural evolution of ga–cu model catalysts for co(2) hydrogenation reactions
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7830109/
https://www.ncbi.nlm.nih.gov/pubmed/33510828
http://dx.doi.org/10.1021/acs.jpcc.0c09382
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