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Synthesis of lactic acid starting from glycerol catalyzed by CaO-supported CuO and metallic Cu catalysts in Ca(OH)2 aqueous solution

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Abstract

CaO-supported non-precious CuO and metallic Cu catalysts were prepared by subsequent impregnation, calcination, and H2 reduction procedures. The synthesis of lactic acid via the dehydrogenation of glycerol catalyzed by the resultant CuO/CaO and Cu/CaO catalysts was investigated at a higher initial glycerol concentration up to 2 mol L‒1 in a Ca(OH)2 aqueous solution. The CaO-supported metallic Cu catalysts showed higher catalytic activity than the CaO-supported CuO catalysts. When the glycerol dehydrogenation was catalyzed by the Cu(16)/CaO catalyst with the Ca(OH)2/glycerol molar ratio and catalyst/glycerol weight ratio of 0.8:1 and 5:100 at 230 °C for 4‒6 h, the lactic acid selectivity could reach 97.1% at the glycerol conversion of above 98%. The reaction kinetics simulation with the use of an empirical power type model showed that the reaction activation energies on the Cu(16)/CaO and CuO(16)/CaO catalysts were 22.2 and 102.8 kJ mol−1, respectively. The metallic Cu active component much more effectively catalyzes the glycerol dehydrogenation reaction than the CuO active component.

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Acknowledgements

Our present work was financially supported by the fund from the Liaoning Science and Technology Department, China (2021JH1/10400063).

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  1. Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China

    Aili Wang, Qinghua Xu & Hengbo Yin

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  1. Aili Wang
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Correspondence to Hengbo Yin.

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Wang, A., Xu, Q. & Yin, H. Synthesis of lactic acid starting from glycerol catalyzed by CaO-supported CuO and metallic Cu catalysts in Ca(OH)2 aqueous solution. Reac Kinet Mech Cat 135, 3205–3221 (2022). https://doi.org/10.1007/s11144-022-02328-1

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