Mechanism of CO preferential oxidation catalyzed by Cu n Pt (n=3–12): a DFT study

Mechanism of CO preferential oxidation catalyzed by Cu n Pt (n=3–12): a DFT study The CO preferential oxidation reaction (PROX) is particularly well suited for hydrogen purification for proton exchange membrane fuel cell applications. In this work, the mechanism of CO-PROX catalyzed by Cu n Pt (n = 3–12) clusters has been studied by density functional theory calculations. The calculated results indicate that the most favored adsorption site of H2 for all clusters is on the Pt sites, and O2 prefers to bind on Cu sites and CO bind on Pt sites. The lowest energy barrier for hydrogen dissociation is 0.02 eV. Smaller H–Pt bond length of Cu n PtH2 corresponds to larger H–H bond length. CO-PROX occurs via the main intermediates of COOH and OH. Cu6Pt is proposed as the most effective catalyst for CO-PROX. To understand the high catalytic activity of Cu n Pt clusters, the nature of the interaction between adsorbate and substrate is also analyzed by detailed electronic local density of states. These findings enrich applications of Cu-based materials to the field of high-activity catalysts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Mechanism of CO preferential oxidation catalyzed by Cu n Pt (n=3–12): a DFT study

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Publisher
Springer Netherlands
Copyright
Copyright © 2015 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-015-2012-7
Publisher site
See Article on Publisher Site

Abstract

The CO preferential oxidation reaction (PROX) is particularly well suited for hydrogen purification for proton exchange membrane fuel cell applications. In this work, the mechanism of CO-PROX catalyzed by Cu n Pt (n = 3–12) clusters has been studied by density functional theory calculations. The calculated results indicate that the most favored adsorption site of H2 for all clusters is on the Pt sites, and O2 prefers to bind on Cu sites and CO bind on Pt sites. The lowest energy barrier for hydrogen dissociation is 0.02 eV. Smaller H–Pt bond length of Cu n PtH2 corresponds to larger H–H bond length. CO-PROX occurs via the main intermediates of COOH and OH. Cu6Pt is proposed as the most effective catalyst for CO-PROX. To understand the high catalytic activity of Cu n Pt clusters, the nature of the interaction between adsorbate and substrate is also analyzed by detailed electronic local density of states. These findings enrich applications of Cu-based materials to the field of high-activity catalysts.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 14, 2015

References

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