Selective Hydrogenation of Cinnamaldehyde over Cobalt Supported on Alumina, Silica and Titania

被引：33
|
作者：
Raj, K. Joseph Antony [1 ]
Prakash, M. G. [1 ]
Elangovan, T. [1 ]
Viswanathan, B. [1 ]
机构：
[1] Indian Inst Technol Madras, Natl Ctr Catalysis Res, Madras 600036, Tamil Nadu, India
来源：
CATALYSIS LETTERS | 2012年 / 142卷 / 01期
关键词：
Selective hydrogenation; Cobalt supported catalysts; Cinnamaldehyde; Cinnamyl alcohol; SUPERCRITICAL CARBON-DIOXIDE; AMORPHOUS ALLOY CATALYST; ALPHA; BETA-UNSATURATED ALDEHYDES; CINNAMYL ALCOHOL; ACROLEIN HYDROGENATION; GLUCOSE HYDROGENATION; PARTICLE-SIZE;
D O I：
10.1007/s10562-011-0693-0
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：
The liquid phase selective hydrogenation of cinnamaldehyde has been investigated on cobalt (15 wt%) impregnated on alumina, silica and various phases of titania supports. The multiple reduction stages observed in the TPR studies suggest the presence of cobalt aluminate/silicate/titanate species, and DRIFT spectra results seem to corroborate this observation. An optimum level of conversion and selectivity to cinnamyl alcohol was observed at 120 degrees C and 10 kg/cm(2) hydrogen pressure. Co/TiO2 exhibited a greater conversion (47.4%) and selectivity to cinnamyl alcohol (58%) than Co/Al2O3 and Co/SiO2, which may be attributed to the presence of TiOx (x < 2) species on the catalyst surface and to the preferential adsorption of C=O on the catalyst surface. The stability of Co/TiO2 was found to be better than Co/Al2O3 and Co/SiO2. Between the various phases of titania (high surface area, anatase and rutile), the crystalline phases exhibited a better conversion and selectivity to cinnamyl alcohol, while the stability was found to be better for high surface area titania.
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收藏
页码：87 / 94
页数：8
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