Acta Phys. -Chim. Sin. ›› 2022, Vol. 38 ›› Issue (10): 2204037.doi: 10.3866/PKU.WHXB202204037

Special Issue: Catalytic Conversion of Biomass

• ARTICLE • Previous Articles     Next Articles

Preparation of a Pt/NbPWO Bifunctional Catalyst for the Hydrogenolysis of Alkali Lignin to Aromatic Monomers

Meifang Cao1, Bo Chen1, Tao Ruan1, Xinping Ouyang1,*(), Xueqing Qiu2,*()   

  1. 1 School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, China
    2 School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2022-04-20 Accepted:2022-05-17 Published:2022-05-23
  • Contact: Xinping Ouyang,Xueqing Qiu E-mail:ceouyang@scut.edu.cn;cexqqiu@scut.edu.cn
  • About author:Email: cexqqiu@scut.edu.cn (X.Q.)
    Email: ceouyang@scut.edu.cn (X.O.)
  • Supported by:
    the National Key Research and Development Program of China(2019YFC1905301);National Natural Science Foundation of China(22078115);National Natural Science Foundation of China(21776108);National Natural Science Foundation of China(21690083);National Natural Science Foundation of China(22008078)

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Abstract:

Lignin is a natural aromatic polymer that accounts for nearly 30% of lignocellulose and is considered the only renewable aromatic (re)source for producing aromatic chemicals or liquid fuels via the cleavage of C―O ether bonds and C―C bonds. Thus far, the majority of investigations involving the production of valuable compounds via lignin hydrogenolysis have focused on the cleavage of relatively labile C―O bonds only, which restricts the efficiency of hydrogenolysis. Therefore, in this work, a bifunctional Pt/NbPWO catalyst was synthesized using hydrothermal and wet impregnation methods. It was found that aromatic monomers with a yield of 18.02% could be obtained by breaking the C―O and C―C bonds in alkali lignin. This reaction was applicable to breaking the key C―C bonds when the C―O ether bonds were broken in lignin polymers. The hydrogenolysis mechanism most likely involves the abundant Brønsted acid and Lewis acid sites on the catalyst that facilitate C―C bond activation. Additionally, the synergy between the support and Pt species in the Pt/NbPWO catalyst was primarily emphasized.

Key words: Alkali lignin, Bifunctional catalyst, Brønsted and Lewis acids, Synergistic effects