高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (1): 83.

• 研究论文 • 上一篇    下一篇

CO在Sm/Rh(100)模型表面上的吸附与反应

马运生1, 朱俊发2, 周维平3, 翟润生3, 包信和3, 张新夷2, 庄叔贤1   

  1. 1. 中国科学技术大学化学物理系, 合肥 230026;
    2. 中国科学技术大学国家同步辐射实验室, 合肥 230029;
    3. 中国科学院大连化学物理研究所催化基础研究国家重点实验室, 大连 116023
  • 收稿日期:2001-02-19 出版日期:2002-01-24 发布日期:2002-01-24
  • 通讯作者: 庄叔贤(1941年出生),男,硕士,教授,从事表面与催化研究.E-mail:szhuang@ustc.edu.cn E-mail:szhuang@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29873042);催化基础研究国家重点实验室基金资助

Adsorption and Reaction of CO on the Sm/Rh(100) Model Surface

MA Yun-Sheng1, ZHU Jun-Fa2, ZHOU Wei-Ping3, ZHAI Run-Sheng3, BAO Xin-He3, ZHANG Xin-Yi2, ZHUANG Shu-Xian1   

  1. 1. Departmentof Chemical Physics, University of Scienceand Technology of China, Hefei 230026, China;
    2. National Synchrotron Radiation Laboratory, Universityof Scienceand Technology of China, Hefei 230029, China;
    3. State Key Laboratory of Catalysis, Dalian Instituteof Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2001-02-19 Online:2002-01-24 Published:2002-01-24

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被引次数

3

摘要： 应用AES,LEED,XPS和TDS研究了Rh(100)上Sm膜和Sm/Rh表面合金以及CO在这两类模型表面的吸附与反应.室温下Sm在Rh(100)上的生长遵从SK模式,Sm膜经900K高温退火后可形成有序表面合金.在室温制备的Sm膜/Rh(100)表面上,室温下CO在Sm上的吸附改变了表面结构,生成SmOx和表面碳.随着Sm覆盖度的增加,低温脱附峰(α-CO)面积迅速下降,且峰温向高温方向位移;表明Sm的空间位阻和电子效应同时起作用.在Sm/Rh合金表面上,CO在约590K出现新的脱附峰,可归属为受Sm电正性修饰的Rh原子上的CO脱附峰

关键词: Rh(100)表面, Sm膜, Sm/Rh表面合金, CO吸附

Abstract: The preparation of Sm overlayer and Sm/Rh surface alloy on Rh(100) surface, adsorption and reaction of CO on these two model surfaces were investigated with AES, LEED, XPS and TDS. The growth of Sm overlayer appears following the SKmode at room temperature. Annealing of Sm overlayer at 900 Kleads to formation of the ordered Sm/Rh surface alloy which exhibits the c(5√2×√2)R45°-Sm and c(2×2)-Sm LEEDpatterns. The morphology of Sm/Rh(100) surface changes completely during COadsorption due to the formation of SmOx and surface carbon. With the increasing of the Sm coverage, a drastic decrease in the peak area and a peak shift to higher temperature were observed for the low temperature desorption of CO(α-CO) from the Sm/Rh(100) surface, indicating that both the site blocking of pre adsorbed Sm and the electron donation from Sm can simultaneously affect the COadsorption. In the case of the Sm/Rh surface alloy, a new desorption peak of COgrows at ～590 K, which is assigned to COon the Sm-affected Rh sites.

Key words: Rh(100) surface, Sm film, Sm/Rh surface alloy, CO adsorption

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