Journal
JOURNAL OF CATALYSIS
Volume 282, Issue 1, Pages 228-236Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2011.06.017
Keywords
Cinnamaldehyde hydrogenation; Selective hydrogenation; Acidity; Platinum; Mesoporous supports
Categories
Funding
- European 6th Framework Program [506621]
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Three Pt catalysts exhibiting similar metal particles size (< 2 nm) were prepared on mesoporous supports differing by their chemical composition and tested in the liquid phase hydrogenation of cinnamaldehyde. The hydrogenation of the C=C bond was favored with Pt/SBA-15 and Pt/Al-SBA-15, with significantly higher reaction rates on the latter catalyst. The acidic support changes the adsorptive properties of the platinum nanoparticles, modifying their surface electron density and possibly their morphology. In contrast, Pt/Al2O3 was the most selective catalyst of the series toward cinnamyl alcohol, with C=C and C=O hydrogenations taking place at the same rate. The presence of Lewis acidic sites close to the particles is assumed to favor the adsorption of molecules via their polar C=O bond. Even if cinnamaldehyde hydrogenation does not require acidic sites to be performed, the composition and acidity of the support significantly influence the reaction rate and selectivity. (C) 2011 Elsevier Inc. All rights reserved.
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