高等学校化学学报

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (1): 75.

• 论文 • 上一篇    下一篇

一氧化碳在Ru/Al2O3上吸附态的相互转化和稳定性的研究

辛勤1, 张慧1, 应品良1, 郭燮贤1, 陈耀强2, 陈豫2   

  1. 1. 中国科学院大连化学物理研究所;
    2. 四川大学分析测试中心
  • 收稿日期:1981-07-21 出版日期:1983-02-24 发布日期:1983-02-24

A STUDY ON THE TRANSFORMATION AND STABILITY OF ADSORPTION STATES OF CARBON MONOXIDE ON ALUMINA SUPPORTED RUTHENIUM

Xin Qin1, Zhang Hui1, Ying Pinliang1, Guo Xiexian1, Chen Yaoqiang2, Chen Yu2   

  1. 1. Dalian Institute of Chemical Physics, Academia Sinica Dalian;
    2. Centre of Analysis and Measurement, Sichuan University Chengdu
  • Received:1981-07-21 Online:1983-02-24 Published:1983-02-24

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摘要： 本文利用差分红外光谱方法研究了不同预处理条件下,CO在4% Ru/Al2O3上的吸附,以及H2和CO在Ru/Al2O3上的共吸附。对CO在Ru上吸附态的红外光谱进行了归属,认为2070cm-1—2060cm-1的中频谱带是孪生CO吸附态的对称伸缩振动和线式CO吸附态的伸缩振动相叠合的谱带。讨论了表面碳(CS)、表面氧(OS)、表面氢(HS)对CO吸附态的影响,认为CO在Ru上发生岐化反应形成的表面碳可使Ru=CO键加强,共吸附H2可使Ru—CO键削弱。表面氧促使形成缺电子的中心,在此中心上生成CO孪生吸附态。CO的孪生吸附是活化吸附过程。

Abstract: Adsorption of carbon monoxide and the co-adsorption of hydrogen and carbon monoxide on alumina supported 4% ruthenium have been studied by the differential infrared spectroscopy. The bands of COadsorbed on ruthenium have been assigned. The band of medium frequency at 2070-2060cm-1 is assigned to the overlap bands of symmetric stretching vibration of twin COand stretching vibration of linearly adsorbed CO. The influences of surface C (Cs), surface H (Hs) and surface O (Os) on adsorption states of carbon monoxide are discussed. It is shown that the surface carbon formed by the disproportionation of CO enhances strengthening of Ru-CO bonding, however, the co-adsorption of hydrogen weakens strengthening of Ru-CO bonding. Surface oxygen impels to form the site deficient electron. Twin CO could be formed in the sites. Adsorption of twin CO is active adsorption.

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