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Acta Phys. -Chim. Sin.  2011, Vol. 27 Issue (02): 329-336    DOI: 10.3866/PKU.WHXB20110226
THEORETICAL AND COMPUTATIONAL CHEMISTRY     
Reaction Mechanisms of CO Oxidation Catalyzed by Binary Copper Group Cluster Anions
HU Jian-Ping1, WANG Jun2, TANG Dian-Yong1, FU Qin-Chao1, ZHANG Yuan-Qin1
1. Molecular Design Center, College of Chemistry and Life Science, Leshan Normal University, Leshan 614000, Sichuan Province, P. R. China;
2. Neurology Department, Chengdu Military General Hospital, Chengdu 610083, P. R. China
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Abstract  

The detailed mechanisms of CO oxidation catalyzed by AuAg-, AuCu-, and AgCu- were investigated using density functional theory at the B3LYP level. The computational results indicate that the adsorption site of CO onto the mixed clusters decreases as follows: Cu>Au>Ag. Copper is the preferred adsorption site for O2 on the binary clusters. The adsorption of O2 onto gold was found to be the weakest. Three reaction pathways exist for CO oxidation catalyzed by AuAg-, AuCu-, and AgCu-. The most feasible pathway for CO oxidation catalyzed by AuAg- is CO insertion into the Ag―O bond of AuAgO2- to produce the [Au―AgC(O―O)O]- intermediate, which then decomposes into CO2 and AuAgO-, or another CO molecule attacks [Au―AgC(O―O)O]- to form two CO2 molecules and AuAg- anion. A feasible pathway for CO oxidation catalyzed by AuCu- or AgCu- is initiated by the co-absorption of CO and O2 onto the clusters followed by the formation of a four-membered ring intermediate to produce the corresponding products. The cooperation effect of the second CO is very weak. The catalytic activities of AuAg- and AuCu- toward CO oxidation are stronger than that of Au2- . Doping the Au clusters with Ag and Cu increases the catalytic activity. These results are in agreement with the previous experimental results.



Key wordsDensity functional theory      CO oxidation      Binary copper group cluster anion      Reaction mechanism     
Received: 25 August 2010      Published: 05 January 2011
MSC2000:  O641  
Fund:  

The project was supported by the Key Project of Chinese Ministry of Education (210189), Science and Technology Bureau of Sichuan Province, China (2008JY0119), and Education Bureau of Sichuan Province, China (07ZA158).

Corresponding Authors: TANG Dian-Yong     E-mail: qchem@189.cn
Cite this article:

HU Jian-Ping, WANG Jun, TANG Dian-Yong, FU Qin-Chao, ZHANG Yuan-Qin. Reaction Mechanisms of CO Oxidation Catalyzed by Binary Copper Group Cluster Anions. Acta Phys. -Chim. Sin., 2011, 27(02): 329-336.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20110226     OR     http://www.whxb.pku.edu.cn/Y2011/V27/I02/329

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