Effect of the interaction of phenolic hydroxyl with the benzene rings on lignin pyrolysis. (August 2020)

• Record Type: Journal Article
• Authors: Ma, Hao; Li, Tengfei; Wu, Shubin; Zhang, Xiaohua
• Is Part Of: Bioresource technology. Volume 309(2020)
• Publication Date: 2020-08
• Subjects: Lignin -- Pyrolysis -- Phenolic hydroxyl -- Interaction -- Electron cloud; 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.2020.123351
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Phenolic hydroxyl could reduces the stability of lignin during pyrolysis. Phenolic hydroxyl can promote the removal of the side chain on the benzene ring. Phenolic hydroxyl can promote the cleavage of the methoxy group on the benzene ring. Electron cloud density of the benzene ring will affect the coking reaction of lignin. Phenolic hydroxyl can increased Ea during the second stage of lignin pyrolysis. Abstract: In this study, lignin with different phenolic hydroxyl contents and five model compounds are pyrolyzed to investigate the effect of the interaction of phenolic hydroxyl with a benzene ring on lignin pyrolysis. The results demonstrated that phenolic hydroxyl can reduce the stability of lignin and promote the elimination of the side chain on lignin during pyrolysis. The repolymerization during lignin pyrolysis, which results in increased activation energy and char yield during pyrolysis, can be mainly attributed to phenolic hydroxyl. Meanwhile, the repolymerization because of phenolic hydroxyl is obviously affected by the electron cloud density of the benzene ring. The repolymerization caused by the phenolic hydroxyl can be effectively reduced by increasing the electron cloud density. Furthermore, regulation of the product distribution obtained via lignin pyrolysis by changing the electron cloud density of the benzene ring and the phenolic hydroxyl content in lignin is proposed.