FOURIER-TRANSFORM INFRARED STUDY OF RH/SIO2 CATALYSTS EXPOSED TO CO H2 MIXTURES AT HIGH-PRESSURE AND TEMPERATURE

被引:18
作者
MCQUIRE, MW [1 ]
ROCHESTER, CH [1 ]
ANDERSON, JA [1 ]
机构
[1] UNIV DUNDEE,DEPT CHEM,DUNDEE DD1 4HN,SCOTLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1991年 / 87卷 / 12期
关键词
D O I
10.1039/ft9918701921
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
FTIR spectra are reported of Rh/SiO2 exposed to 1:2 and 2:1 mixtures of CO:H2 at 3 atm total pressure and 503, 523 and 553 k. Linear and bridged CO existed on Rh during reaction which led to methane, methanol and ethanol as the dominant products. IR bands due to adsorbed CH3 and CH2 groups primarily resulted from alcohol adsorption on the silica support giving surface methoxy and ethoxy groups. An IR band at 3124 cm-1 is ascribed to an unsaturated hydrocarbonaceous residue, the build-up of which displaces linearly bonded CO from the Rh surface and also decreases the catalyst selectivity for methane formation.
引用
收藏
页码:1921 / 1928
页数:8
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