INFRARED STUDY OF CO ADSORPTION ON PT-RH/SIO2 CATALYSTS

被引:20
作者
ANDERSON, JA [1 ]
SOLYMOSI, F [1 ]
机构
[1] ATTILA JOZSEF UNIV,REACT KINET RES GRP,H-6701 SZEGED,HUNGARY
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1991年 / 87卷 / 20期
关键词
D O I
10.1039/ft9918703435
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
Infrared spectra are reported of CO adsorbed on Pt/SiO2, Rh/SiO2 and Pt-Rh/SiO2 in the temperature ranges 93-300 and 303-573 K. CO adsorption as a function of time was studied for high-temperature reduced samples (973 K). The influence of platinum was to decrease the rate at which the rhodium gem-dicarbonyl species was formed and to increase the rate at which metal clusters were reformed. Coupling effects between Pt-CO and Rh-CO at low temperatures indicate that crystallites exist containing well mixed surface layers of platinum and rhodium atoms. The effect of platinum on rhodium particle morphology is discussed.
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页码:3435 / 3442
页数:8
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