The effect of crystallite size of nickel on the enantioselectivity of modified nickel catalysts.

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概要

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• Enantioselective hydrogenation of methyl acetoacetate to methyl 3-hydroxybutyrate with various unsupported nickel catalysts modified by (2<I>R</I>,3<I>R</I>)-tartaric acid was studied under mild conditions in order to elucidate the dependence of the selectivity upon the surface states of the catalysts. The catalyst with the larger crystallite size has the higher enantioselectivity, presumably because of the higher probability to obtain large ensembles of regularlyarranged nickel atoms in the catalyst surface for the modifier to adsorb strongly and regularly. The nickel boride catalyst has very low enantioselectivity, mainly due to its amorphous structure. The detrimental effect of additives (B, P, and Al in Ni–B, Ni–P, and R–Ni catalysts) was explained as the effect of their lowering the crystallinity of the catalysts.

• 公益社団法人 日本化学会の論文

著者

• Nitta Yuriko

  Department Of Chemical Engineering Faculty Of Engineering Science Osaka University

• Imanaka Toshinobu

  Department Of Chemical Engineering Faculty Of Engineering Science Osaka University

• Teranishi Shiichiro

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

• Sekine Fumimaro

  Department of Chemical Engineering, Faculty of Engineering Science, Osaka University

• Teranishi Shiichiro

  Department of Chemical Engineering, Faculty of Engineeing Science, Osaka University

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