Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (24): 2765-2772. Previous Articles     Next Articles

Special Topic

CeO2(110)表面上CO氧化反应的密度泛函理论研究

滕波涛, 蒋仕宇, 郭晓伟, 袁金焕, 罗孟飞   

  1. 浙江师范大学物理化学研究所 浙江省固体表面重点实验室 金华 321004
  • 投稿日期:2009-05-21 修回日期:2009-06-30 发布日期:2010-02-04
  • 通讯作者: 滕波涛 E-mail:tbt@zjnu.cn
  • 基金资助:

    浙江省自然科学基金(Y407163;Y407020)

A Density Functional Theory Study of CO Oxidation on CeO2(110) Surface

TENG Bei-Chao, JIANG Shi-Yu, GUO Xiao-Wei, YUAN Jin-Huan, LUO Meng-Fei   

  1. (Zhejiang Key Laboratory of Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004)
  • Received:2009-05-21 Revised:2009-06-30 Published:2010-02-04
  • Contact: Teng Bo-Tao E-mail:tbt@zjnu.cn

CO adsorption and oxidation reaction on the CeO2(110) surface were systematically investigated using density functional theory (DFT). It was found that O2 adsorption on the clean CeO2(110) surface is thermodynamically unfavorable. When surface oxygen vacancy exists, strong adsorption occurs and the O2/Ov species forms, which might be one of the most important oxygen species for oxidative reaction. Two types of CO adsorption structures on the clean CeO2(110) surface were observed. The strong chemisorbed configurations form a bidentate carbonate intermediate; while only weak interactions occur between CO and CeO2(110) surface for the physisorbed one. On the CeO2(110) surface with oxygen vacancy, both carbonate species and molecular CO were obtained with low adsorption energies. When O2 adsorbs on the surface with oxygen vacancy (O2/Ov), CO might strongly adsorb on the surface to form carbonate intermediate, or directly form CO2. It was very interesting to find that the carbonate species on the O2/Ov/CeO2(110) surface desorbs to CO2 through the bidentate and monodentate intermediates. According to the extended Hückel (eH) theory, it was indicated that the electrons of three oxygen atoms of the carbonate intermediate are partial delocalization. The electronic structures of the physisorbed CO and CO2 product on the CeO2(110) are much similar to those of free molecules.

Key words: CO oxidation, CeO2(110) surface, density functional theory, extended Hückel molecular orbitaltheory