高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (4): 601.

• 论文 • 上一篇    下一篇

CO在轻微氧化的Mo(100)表面上的吸附和反应

朱俊发1, 郭建昌3, 翟润生3, 包信和3, 庄叔贤2   

  1. 1. 中国科学技术大学国家同步辐射实验室,
    2. 化学物理系, 合肥 230029;
    3. 中国科学院大连化学物理研究所催化基础国家重点实验室, 大连 160023
  • 收稿日期:1999-04-16 出版日期:2000-04-24 发布日期:2000-04-24
  • 通讯作者: 庄叔贤(1961年出生),男,硕士,教授,从事表面与催化研究.E-mail:szhuang@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29873042);催化基础国家重点实验室资助

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. 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

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被引次数

1

摘要： 应用HREELS和TDS研究了120K时CO在轻微氧化的Mo(100)上的吸附和脱附状况.120K时,CO在轻微氧化的Mo(100)上存在顶位垂直吸附(νCO=2016～2050cm-1)、四重空位倾斜吸附(νCO=1088cm-1)和通过π键与表面发生作用的倾斜吸附(νCO=1600cm-1).当表面温度升高时,顶位吸附的CO在低覆盖度下发生解离,但在较高覆盖度下,可以同时发生脱附(Tp=319K)和解离;而后两种吸附态在温度升高时只发生解离.CO解离产生的C原子和O原子在930K和1320K时可重新结合成CO脱附.

关键词: Mo(100), 高分辨电子能量损失谱, 热脱附谱, CO, 吸附, 脱附

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 (vCO =2016—2050 cm-1 ), bonded in four-fold hollow sites with a tilted geometry (vCO =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 (vCO =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( Tp=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

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