Hydrogen production on iron–magnesium oxide in the high-temperature water-gas shift reaction |
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Authors: | Amel Boudjemaa Aline Auroux Souhila Boumaza Mohamed Trari Ouiza Cherifi and Rabah Bouarab |
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Institution: | (1) Stereochemistry Research Group of the Hungarian Academy of Sciences, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary;(2) Department of Organic Chemistry, University of Szeged, Szeged, Hungary |
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Abstract: | The effect of the structure of the achiral primary amine additive on the enantioselective heterogeneous catalytic hydrogenation
of (E)-2-methyl-2-butenoic acid over cinchonidine modified Pd/Al2O3 was studied. It was found that a variety of amines increase the enantioselectivity, which was always accompanied by decrease
in the initial rate of the hydrogenations. Based on these results, the participation of the amine additive in the formation
of the intermediate complex responsible for enantioselection was suggested. A decrease in the reaction temperature resulted
in further increase in the optical purity of the product up to 67%, the highest value reported in the hydrogenation of unsaturated
aliphatic acids in this heterogeneous catalytic system so far. |
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Keywords: | Enantioselective catalytic hydrogenation cinchonidine (E)-2-methyl-2-butenoic acid palladium amine additive |
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