Mild depolymerization of the sinocalamus oldhami alkali lignin to phenolic monomer with base and activated carbon supported nickel-tungsten carbide catalyst composite system. (August 2021)

• Record Type: Journal Article
• Authors: Lin, Xiuhua; Chen, Lihui; Li, Heyu; Lv, Yuancai; Liu, Yifan; Lu, Xuebin; Liu, Minghua
• Is Part Of: Bioresource technology. Volume 333(2021)
• Publication Date: 2021-08
• Subjects: Lignin -- Depolymerization -- Phenolic monomer -- Synergism catalysis -- Sinocalamus oldhami; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125136
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The composite system exhibits excellent activity on depolymerization of lignin. The repolymerization of the intermediates is effectively avoided. The composite system produces phenolic monomers with 17.18 wt% yield. Possible mechanism involved synergism of the base and metal catalysts were studied. Abstract: In this study, the sinocalamus oldhami alkali lignin was depolymerized into phenolic products in a combined system by using the composite alkali and Ni-W2 C/activated carbon (AC) as catalysts. FT-IR, GPC, TG, 2D-HSQC and GC–MS were used to analyze the composition, structure and distribution of degradation products, and the synergistic effect of metal and alkali catalysts on the depolymerization of lignin was also studied. The results showed that Ni-W2 C/AC and composite alkali could effectively improve the catalytic degradation efficiency of lignin under mild conditions, 94.4% of lignin was converted and 17.18% of phenolic monomers were obtained under 260 °C for 5 h. In this composite system, the synergism of the basic sites, the metal active sites and the Lewis acid sites could promote the cleavage of C–O bonds in the lignin molecule and lower the char formation during the base-catalyzed solvolysis. Phenolic monomers were mainly composed of phenol, 2-methyl-phenol and p -cresol etc.