Efficient Ni‐Cu/AC Bimetal Catalyst for Hydrogenolysis of Lignin to Produce High‐Value‐Added Chemicals. Issue 32 (27th August 2020)

• Record Type: Journal Article
• Authors: Zhang, Le; Feng, Junfeng; Cai, Bo; Zhu, Huimin; Zhu, Yanqi; Pan, Hui
• Is Part Of: ChemistrySelect. Volume 5:Issue 32(2020)
• Page Start: 10090
• Page End: 10097
• Publication Date: 2020-08-27
• Subjects: lignin -- β-O-4 model compound -- hydrogenolysis -- bimetallic catalyst; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202002069
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Efficient depolymerization of natural lignin is the key step to convert lignin to sustainable and added‐value chemicals. In this paper, a carbon‐supported Ni‐Cu bimetallic catalyst was developed for the hydrogenation of poplar lignin and β‐O‐4 model compounds. Five Ni‐Cu bimetallic catalysts were prepared by immobilizing Ni and Cu at fixed Ni loading (5%) and varied Cu loading (0%, 5%, 10%, 20%, 30%) on activated carbon (AC). All the Cu‐Ni/AC bimetal catalysts exhibited higher catalytic activity than either Ni/AC or Cu/AC catalysts. 5Ni‐5Cu/AC gave the highest bio‐oil yield of 40.2 wt% for the hydrogenation of. poplar lignin. The XPS, XRD, and HRTEM characterization of the catalysts showed that elemental copper and Cu‐Ni alloy were formed on the surface of 5Ni‐5Cu/AC catalyst, which could promote the efficient depolymerization of lignin into phenolic monomers. The possible mechanism for the lignin depolymerization was also studied and proposed based on the β‐O‐4 bond model compounds. This study provides a viable strategy for the conversion of lignin into added‐value chemicals with low cost catalyst. Abstract : An effective method to effectively depolymerize lignin is introduced. The experiment uses the hydrogenation process of bimetallic Ni−Cu/AC catalyst to convert lignin into high value‐added phenolic chemicals. The extraction method is used to separate the phenolic chemicals in the product. After depolymerization, the highest bio‐oil content in the product is reacted at 200 °C for 5 h, and the yield of bio‐oil is 40.2 wt%.