期刊
APPLIED CATALYSIS A-GENERAL
卷 314, 期 1, 页码 73-80出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2006.08.004
关键词
citral hydrogenation; rhodium; platinum; germanium; titania; catalysts
Bimetallic Rh-Ge/TiO2 and Pt-Ge/TiO2 catalysts prepared by surface redox reaction (catalytic reduction method) were tested for the selective hydrogenation of citral. Samples were reduced either at 300 degrees C or at 500 degrees C (SMSI effect). For both Rh and Pt series, the unsaturated alcohols (UA) selectivity goes through an optimum as a function of the germanium content whatever the reduction temperature. For low Ge loadings, it was possible to combine the bimetallic and SMSI effects, inducing a high UA selectivity on bimetallic catalysts supported on TiO2. On the other hand, at high Ge loadings the bimetallic effect was predominant and led also to a high UA selectivity. Moreover, TiO2 support contributed to stabilize the bimetallic Rh-Ge and Pt-Ge particles prepared by catalytic reduction toward an air exposure at ambient temperature. (c) 2006 Elsevier B.V. All rights reserved.
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