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- Title
Selective Hydrogenation of Cinnamaldehyde over Cobalt Supported on Alumina, Silica and Titania.
- Authors
Joseph Antony Raj, K.; Prakash, M.; Elangovan, T.; Viswanathan, B.
- Abstract
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 °C and 10 kg/cm hydrogen pressure. Co/TiO exhibited a greater conversion (47.4%) and selectivity to cinnamyl alcohol (58%) than Co/AlO and Co/SiO which may be attributed to the presence of TiO ( x < 2) species on the catalyst surface and to the preferential adsorption of C=O on the catalyst surface. The stability of Co/TiO was found to be better than Co/AlO and Co/SiO. 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. Graphical Abstract: The liquid phase selective hydrogenation of cinnamaldehyde has been investigated on cobalt impregnated on AlO, SiO and TiO supports. The observed trend for conversion and selectivity to cinnamyl alcohol was Co/TiO > Co/SiO > Co/AlO. The hydrogenation of CMA is believed to preferentially proceed via adsorption of C=O on the surface of Co/TiO.[Figure not available: see fulltext.]
- Subjects
HYDROGENATION; ALDEHYDES; COBALT catalysts; CATALYST supports; ALUMINUM oxide; SILICA; TITANIUM dioxide; ALCOHOLS (Chemical class)
- Publication
Catalysis Letters, 2012, Vol 142, Issue 1, p87
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-011-0693-0