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Hydrogenation of phenylpyruvic acid to phenylalanine catalyzed by Ni-B/SiO_2

Journal of Natural Gas Chemistry 2008年第3期17卷 303-308页

作者： Qunfang Liang Aiqing Zhang Lin Li Key Laboratory of Catalvsis and Materials Science of the State Ethnic Affairs Commission ＆ Ministry of Education College of Chemistry and MateriaLs Science South-Central University for Nationalities Wuhan 430074 Hubei China

Phenylalanine （Phe） is a significant amino acid that cannot be synthesized by human themselves but must be taken from environment. It was initially found that the nanosized amorphous Ni-B/SiO2 alloy prepared by the chemical reduction method was an effective catalyst for the preparation of Phe from phenylpyruvic acid （PPA） by amination and hydrogenation. It has been found that the amorphous Ni-B/SiO2 alloy catalyst exhibits superior activity and selectivity to the traditional catalysts Raney Ni and Urushibara nickel. The effects of reaction time, amounts of catalysts and ammonia solution, reaction temperature, and H2 pressure on the reaction have been investigated systematically. The results indicated that the yield of Phe was 97.9%, and the selectivity for Phe reached 98.9% when the reaction was carried out for 3 h at 333 K and 2.0 MPa of H2 with m（Cat.）： m（PPA） = 0.6 ： 1.0 and n（NH3）： n（PPA） = 3 ： 1. The catalysts were characterized by XRD, AAS, XPS, BET, and TEM, and the relationship between the catalyst structure and the catalytic activity was discussed in detail. It was found that the reason why Ni-B/SiO2 amorphous alloy catalyst was much more active for the preparation of Phe could be accounted for by the presence of electron-rich Ni due to electron donation from alloying B; the smaller size of Ni-B particles, the larger specific surface area of Ni-B/SiO2.

关键词： Ni-B/SiO2 amorphous alloy phenylalanine phenylpyruvic acid hydrogenation catalyst

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