A mechanistic study of CO removal on a small H-saturated platinum cluster

Chenggang Zhou, Shujuan Yao, Bo Han, Liang Chen, Jinping Wu, Robert C. Forrey, Hansong Cheng

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

CO poisoning to platinum catalysts has long been recognized as one of the major technical obstacles in heterogeneous catalysis and its successful removal represents a significant challenge to a wide variety of applications. Using density functional theory (DFT), we performed systematic theoretical calculations to explore the CO removal mechanisms, in the presence of hydrogen, via oxidation by oxygen to form CO2 or reduction by hydrogen to form formaldehyde using a subnano Pt cluster as a model for catalyst nanoparticles. We show that CO oxidation is both thermochemically and kinetically difficult at low H coverage but becomes very exothermic with a moderate activation barrier at high H coverage, suggesting that the oxidation can be carried out readily at elevated temperatures. Doping the Pt cluster with Ru can significantly improve the oxidation thermochemical energy and moderately reduce the activation barrier. The results are consistent with experimental observations. We found that CO reduction by hydrogen to form formaldehyde is moderately endothermic. However, the reaction is predicted to be kinetically difficult due to the relatively high activation barriers associated with the sequential H attacks to the CO molecule.

Original languageEnglish (US)
Pages (from-to)1187-1196
Number of pages10
JournalScience in China, Series B: Chemistry
Volume51
Issue number12
DOIs
StatePublished - Dec 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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