Volume 59, Issue 6 pp. 2289-2293
Communication

Catalytic Production of Alanine from Waste Glycerol

Dr. Yunzhu Wang

Dr. Yunzhu Wang

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585 Singapore

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Prof. Dr. Shinya Furukawa

Prof. Dr. Shinya Furukawa

Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021 Japan

Elements Strategy Initiative for Catalysis and Battery, Kyoto University, Kyoto Daigaku Katsura, Nishikyo-ku, Kyoto, 615-8510 Japan

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Dr. Song Song

Dr. Song Song

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585 Singapore

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Prof. Dr. Qian He

Prof. Dr. Qian He

Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117575 Singapore

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Prof. Dr. Hiroyuki Asakura

Prof. Dr. Hiroyuki Asakura

Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto, 615-8510 Japan

Elements Strategy Initiative for Catalysis and Battery, Kyoto University, Kyoto Daigaku Katsura, Nishikyo-ku, Kyoto, 615-8510 Japan

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Prof. Dr. Ning Yan

Corresponding Author

Prof. Dr. Ning Yan

Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585 Singapore

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First published: 26 November 2019
Citations: 108

Graphical Abstract

Direct conversion: 43 % alanine was achieved from crude glycerol over a Ru1Ni7/MgO catalyst. Ni-doped Ru remarkably promoted lactic acid amination, a key step in the reaction. The catalytic route creates new opportunities for glycerol utilization and enriches the substrate scope of renewable feedstock to access value-added amino acids.

Abstract

Chemical synthesis of amino acids directly from biomass feedstock is rare. Reported here is a one-step protocol to convert crude glycerol, from the biodiesel industry, into 43 % alanine over a Ru1Ni7/MgO catalyst. The multifunctional catalytic system promotes glycerol conversion into lactic acid, and then into alanine. X-ray absorption spectroscopy and scanning transmission electron microscopy revealed the existence of bimetallic RuNi species, whereas density-functional theory calculations suggested Ni-doped Ru substantially decreased the Ea of C−H bond dissociation of lactate alkoxide to form pyruvate, which is the rate-determining step. The catalytic route established in this work creates new opportunities for glycerol utilization and enriches the substrate scope of renewable feedstock to access value-added amino acids.

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