CARBON-DIOXIDE HYDROGENATION ON RHODIUM SUPPORTED ON TRANSITION-METAL OXIDES - EFFECT OF REDUCTION TEMPERATURE ON PRODUCT DISTRIBUTION

被引：48
作者：
TROVARELLI, A [1 ]
MUSTAZZA, C [1 ]
DOLCETTI, G [1 ]
KASPAR, J [1 ]
GRAZIANI, M [1 ]
机构：
[1] UNIV TRIESTE, DIPARTIMENTO SCI CHIM, I-34127 TRIESTE, ITALY
来源：
APPLIED CATALYSIS | 1990年 / 65卷 / 01期
关键词：
adsorption; carbon dioxide hydrogenation; rhodium/niobia; rhodium/titania;
D O I：
10.1016/S0166-9834(00)81593-6
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：
Carbon dioxide hydrogenation has been performed on Rh/TiO2 and Rh/Nb2O5 catalysts and the effects of metal reduction conditions have been investigated. C1-C6 hydrocarbons have been detected and shown to follow Anderson-Schulz-Flory (ASF) statistics. In the case of Rh/TiO2 the role of carbon monoxide as an intermediate in carbon dioxide hydrogenation has been clearly evidenced. In both catalysts the formation of the SMSI state (strong metal-support interactions) during high-temperature reduction strongly influenced catalytic activities and selectivities. On Rh/Nb2O5 the SMSI state was found to be labile in catalytic conditions whereas on Rh/TiO2 it was maintained because of the presence of hydrogen which slowed down the oxidation process operated by water. © 1990.
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页码：129 / 142
页数：14
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