Developing improved catalysts based on a fundamental understanding of reaction mechanism has become one of the grand challenges in catalysis. A theoretical understanding and screening the metal-oxide composite catalysts for the water-gas shift (WGS) reaction is presented here. Density functional theory was employed to identify the key step for the WGS reaction on the Au, Cu–oxide catalysts, where the calculated reaction energy for water dissociation correlates well with the experimental measured WGS activity. Accordingly, the calculated reaction energy for water dissociation was used as the scaling descriptor to screen the inverse model catalysts, oxide/Cu(111), for the better WGS activity. Our calculations predict that the WGS activity increases in a sequence: Cu(111), ZnO/Cu(111) < TiO2/Cu(111), ZrO2/Cu(111) < MoO3/Cu(111). Our results imply that the high performances of Au, Cu–oxide nanocatalysts in the WGS reaction rely heavily on the direct participation of both oxide and metal sites. The degree that the oxide is reduced by Cu plays an important role in determining the WGS activity of oxide/Cu catalysts. The reducible oxide can be transformed from the fully oxidized form to the reduced form due to the interaction with Cu and, therefore, the transfer of electron density from Cu, which helps in releasing the bottleneck water dissociation and, therefore, facilitating the WGS reaction on copper.
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28 November 2010
Research Article|
November 30 2010
Water-gas shift reaction on oxide/Cu(111): Rational catalyst screening from density functional theory
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Author to whom correspondence should be addressed. Electronic mail: pingliu3@bnl.gov. Tel.: 631 344 5970. Fax: 631 344 5815.
J. Chem. Phys. 133, 204705 (2010)
Article history
Received:
July 14 2010
Accepted:
October 08 2010
Citation
Ping Liu; Water-gas shift reaction on oxide/Cu(111): Rational catalyst screening from density functional theory. J. Chem. Phys. 28 November 2010; 133 (20): 204705. https://doi.org/10.1063/1.3506897
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