Preparation of a Pt/NbPWO Bifunctional Catalyst for the Hydrogenolysis of Alkali Lignin to Aromatic Monomers
Meifang Cao,Bo Chen,Tao Ruan,Xinping Ouyang,Xueqing Qiu.Preparation of a Pt/NbPWO Bifunctional Catalyst for the Hydrogenolysis of Alkali Lignin to Aromatic Monomers[J].Acta Physico-Chimica Sinica,2022,38(10):2204037.
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
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.
