Adsorption and Reaction of CO on the Slightly Oxidized Mo(100) Surface

Chem. J. Chinese Universities ›› 2000, Vol. 21 ›› Issue (4): 601.

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Adsorption and Reaction of CO on the Slightly Oxidized Mo(100) Surface

ZHU Jun-Fa¹, GUO Jian-Chang³, ZHAI Run-Sheng³, BAO Xin-He³, ZHUANG Shu-Xian²

1. National Synchrotron Radiation Laboratory;
2. Departmentof Chemical Physics, Universityof Scienceand Technologyof China, Hefei 230029, China;
3. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academyof Sciences, Dalian 116023, China

Received:1999-04-16 Online:2000-04-24 Published:2000-04-24

Abstract

Abstract: The adsorption and desorption of COon the slightly oxidized Mo(100) surface at 120 Kwere studied by HREELSand TDS. It was found that three COmolecular states existed on the slightly oxidized Mo(100) surface at 120 K, namely COterminally bonded on a top sites (v_CO =2016—2050 cm^-1 ), bonded in four-fold hollow sites with a tilted geometry (v_CO =1088 cm^-1 ) and bonded in an inclined manner to a Mo atom through the carbon end and further coordinated to another Mo atom through a π CObond (v_CO =1600 cm^-1 ) respectively. For the terminally bonded CO, heating the surface induced the dissociation at lower coverage. At the higher coverage, however, heating the sample caused the dissociation occurring below 450 Kand desorption( T_p=319 K) simultaneously. For other two COstates, only dissociation could be detected during heating the surface. The chemisorbed carbon and oxygen atoms produced from COdissociation could be recombined to form COto leave the surface at 928 and ~1320 K.

Key words: Mo(100), HREELS, TDS, CO, Adsorption, Desorption

CLC Number:

O643.1

TrendMD:

ZHU Jun-Fa, GUO Jian-Chang, ZHAI Run-Sheng, BAO Xin-He, ZHUANG Shu-Xian . Adsorption and Reaction of CO on the Slightly Oxidized Mo(100) Surface[J]. Chem. J. Chinese Universities, 2000, 21(4): 601.

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Adsorption and Reaction of CO on the Slightly Oxidized Mo(100) Surface

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