一氧化碳在Ru/Al_(2)O_(3)上吸附态的相互转化和稳定性的研究  

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

作　　者：辛勤[1] 张慧[1] 应品良[1] 郭燮贤[1] 陈耀强[2] 陈豫[2] Xin Qin;Zhang Hui;Ying Pinliang;Guo Xiexian;Chen Yaoqiang;Chen Yu(Dalian Institute of Chemical Physics,Academia Sinica Dalian;Centre of Analysis and Measurement,Sichuan University Chengdu)

机构地区：[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

出　　处：《高等学校化学学报》1983年第1期75-80,共6页Chemical Journal of Chinese Universities

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/Al_(2)O_(3)上的吸附,以及H_(2)和CO在Ru/Al_(2)O_(3)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H_(2)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。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 CO adsorbed 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 CO and 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.

关 键 词：对称伸缩振动 共吸附 活化吸附 红外光谱 表面氧 吸附态 一氧化碳 缺电子 

分 类 号：O64[理学—物理化学]