Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (2): 192-203.DOI: 10.1016/S1872-2067(19)63270-5

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Effective production of γ-valerolactone from biomass-derived methyl levulinate over CuOx-CaCO3 catalyst

Xuejuan Caoa, Huai Liua, Junnan Weia, Xing Tanga,b, Xianhai Zenga,b, Yong Suna,b, Tingzhou Leic, Geng Zhaod, Lu Lina,b   

  1. a Xiamen Key Laboratory of Clean and High-valued Utilization for Biomass, College of Energy, Xiamen University, Xiamen 361102, Fujian, China;
    b Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen 361005, Fujian, China;
    c Henan Key Lab of Biomass Energy, Zhengzhou 450008, Henan, China;
    d College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, Henan, China
  • Received:2018-10-25 Revised:2018-11-26 Online:2019-02-28 Published:2019-01-11
  • Contact: S1872-2067(19)63270-5
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21676223, 21706223, 21776234, 21606188), the Fundamental Research Funds for the Central Universities (20720180084), the Natural Science Foundation of Fujian Province of China (2018J01017), the Education Department of Fujian Province (JZ160398) and the Energy development Foundation of Energy College, Xiamen University (2017NYFZ02).

Abstract:

The production of γ-valerolactone (GVL) from lignocellulosic biomass has become a focus of research owing to its potential applications in fuels and chemicals. In this study, (n)CuOx-CaCO3 (where n is the molar ratio of Cu to Ca) compounds were prepared for the first time and shown to function as efficient bifunctional catalysts for the conversion of biomass-derived methyl levulinate (ML) into GVL, using methanol as the in-situ hydrogen source. Among the catalysts with varied Cu/Ca molar ratios, (3/2)CuOx-CaCO3 provided the highest GVL yield of 95.6% from ML. The incorporation of CaCO3 with CuO resulted in the formation of Cu+ species in a CuOx-CaCO3 catalyst, which greatly facilitated the hydrogenation of ML. Notably, CuOx-CaCO3 also displayed excellent catalytic performance in the methanolysis products of cellulose, even in the presence of humins. Therefore, a facile two-step strategy for the production of GVL from cellulose could be developed over this robust and inexpensive catalyst, through the integration of cellulose methanolysis catalyzed by sulfuric acid, methanol reforming, and ML hydrogenation in methanol medium.

Key words: γ-Valerolactone, Methyl levulinate, Hydrocyclization, Methanol reforming, Cellulose methanolysis