oa South African Journal of Chemistry - Hydrogenation of cinnamaldehyde over an ionic cobalt promoted alumina-supported palladium catalyst : research article
|Article Title||Hydrogenation of cinnamaldehyde over an ionic cobalt promoted alumina-supported palladium catalyst : research article|
|© Publisher:||South African Chemical Institute (SACI)|
|Journal||South African Journal of Chemistry|
|Affiliations||1 University of the Free State|
|Publication Date||Jan 2013|
|Pages||216 - 220|
|Keyword(s)||Bimetallic heterogeneous catalyst, Cobalt, Hydrogenation, Palladium and Unsaturated aldehydes|
Nano γ-alumina-supported transition metal-based mono- (Pd0/γ-Al2O3 or CoIII/γ-Al2O3) and bimetallic catalysts (Pd0CoIII/γ-Al2O3), were prepared by wet impregnation, oxidation and in situ reduction of the palladium. The palladium(II) acetate [PdII3(OOCCH3)6], cobalt(II) acetate [CoII(OOCCH3)2]·4H2O and palladium, cobalt bridging tetra acetate [PdIICoII(OOCCH3)4]·H2O·2CH3COOH, were used as catalyst precursors to prepare a 7.4 % mol catalyst/support loading. The oxidation states of these activated catalysts were studied by XPS. These catalysts were evaluated for hydrogenation of cinnamaldehyde in a biphasic reaction under 3MPa of hydrogen at 80 °C. The Pd0/γ-Al2O3 selectively catalyzed the hydrogenation of C=C bond in cinnamaldehyde to form phenylpropanol (100 %). In contrast, catalysis with Pd0CoIII/γ-Al2O3 hydrogenated both C=C and C=O bonds consecutively, forming 65 % phenylpropanal and 35 % phenylpropanol with TOF = 47.2 h-1. No reaction occurred when CoIII/γ-Al2O3 was used.
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