PUMICE-SUPPORTED PD-PT BIMETALLIC CATALYSTS - SYNTHESIS, STRUCTURAL CHARACTERIZATION, AND LIQUID-PHASE HYDROGENATION OF 1,3-CYCLOOCTADIENE

被引:30
作者
DEGANELLO, G
DUCA, D
LIOTTA, LF
MARTORANA, A
VENEZIA, AM
BENEDETTI, A
FAGHERAZZI, G
机构
[1] UNIV PALERMO,DIPARTIMENTO CHIM INORGAN,I-90123 PALERMO,ITALY
[2] UNIV VENICE,DIPARTIMENTO CHIM FIS,I-30123 VENICE,ITALY
关键词
D O I
10.1006/jcat.1995.1015
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
A series of pumice-supported palladium-platinum bimetallic catalysts were prepared and investigated by X-ray scattering (WAXS and SAXS) and XPS techniques. An alloy Pd-Pt was formed. The less abundant metal was found to segregate to the surface. The catalysts were tested in the liquid-phase hydrogenation of 1,3-cyclooctadiene to cyclooctene, and compared with similarly prepared pumice-supported palladium and platinum catalysts and other supported Pd-Pt catalysts reported in the literature. The addition of platinum reduces the activity and the selectivity of the palladium catalysts. Differences between the activity of these pumice-supported catalysts and the activity of previously described Pd and Pd-Pt catalysts on other supports, are attributed to the presence, in the latter, of diffusional processes. (C) 1995 Academic Press, Inc.
引用
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页码:125 / 134
页数:10
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