Selective Production of 1,2-Propylene Glycol from Jerusalem Artichoke Tuber using Ni–W2C/AC Catalysts

Authors

  • Likun Zhou,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
    2. Graduate University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing, 100049 (P.R. China)
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  • Prof. Aiqin Wang,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
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  • Changzhi Li,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
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  • Mingyuan Zheng,

    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
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  • Prof. Tao Zhang

    Corresponding author
    1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
    • State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, Liaoning, 116023 (P.R. China), Fax: (+86) 411-84685940
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Abstract

A series of Ni-promoted W2C/activated carbon (AC) catalysts were investigated for the catalytic conversion of Jerusalem artichoke tuber (JAT) under hydrothermal conditions and hydrogen pressure. Even a small amount of Ni could greatly promote the conversion of JAT to 1,2-propylene glycol (1,2-PG), whereas the pure W2C/AC catalyst resulted in the selective formation of acetol. The product distribution profiles involving the reaction temperature, time, and H2 pressure indicated that 1,2-PG formed as a result of acetol hydrogenation, which was catalyzed by Ni. Thus, there was a synergy between W2C and Ni, and the best performance yielded 38.5 % of 1,2-PG over a 4 % Ni–20 % W2C/AC catalyst at 245 °C, 6 MPa H2, and 80 min. To understand the reaction process, some important intermediates, such as inulin, fructose, acetol, glyceraldehyde, and 1,3-dihydroxyacetone, were used as the feedstock. Based on the product distributions derived from these intermediates, a reaction pathway was proposed, where JAT was first hydrolyzed into a mixture of fructose and glucose under the catalysis of H+, then the sugars underwent a retro-aldol reaction followed by hydrogenation catalyzed by Ni–W2C.

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