Theoretical investigation of the CO oxidation on Al12Zr Cluster

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• 作者：Aixia Li ; Ling Guo ; Xiaoyu An
• 刊名：Protection of Metals and Physical Chemistry of Surfaces
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：52
• 期：1
• 页码：16-23
• 全文大小：705 KB
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• 作者单位：Aixia Li (1)
  Ling Guo (1)
  Xiaoyu An (1)
  
  1. School of Chemistry and Material Science, School of Modern Arts and Sciences, Shanxi Normal University, Linfen, 041004, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Materials Science
  Metallic Materials
  Inorganic Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：2070-206X

文摘

Equilibrium geometries of Al₁₂Zr cluster were systematically studied on the basis of density functional theory with generalized gradient approximation. To gain insights into high catalytic activity we use the CO oxidation as a benchmark probe. In Al–Zr bimetallic clusters, Zr site is the catalytically active centre, the adsorption of CO and O₂ on the same site respectively (single-site mechanism), a Langmuir-Hinshelwood (LH) mechanism is proposed, which proceed via two steps, CO + O₂ → CO₂ + O and CO + O → CO₂. Two CO oxidation mechanisms of two CO₂ molecules as product have been simulated. For the later mechanism, the key step is the O–O bond scission in the OCOO* intermediate, which is significantly accelerated due to the attack of the neighboring CO molecule. The calculated barriers for the later reactions are lower compared with the former reaction. Detailed reaction paths corresponding to this case are calculated. Our study suggests that the CO oxidation catalyzed by Al₁₂Zr cluster is likely to occur at the room temperature. The article is published in the original.