CJCU

Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (1): 83.

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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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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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