In-situ catalytic hydropyrolysis of lignin for the production of aromatic rich bio-oil

• Published in: Journal of the Energy Institute Vol. 101; pp. 187 - 193
• Main Authors: Zhu, Yanfang, Song, Wenqi, Yao, Ruijuan, Zhao, Yuzhen, Xu, Guiyang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2022
• Subjects: Aromatic hydrocarbon; Catalytic hydro-pyrolysis; High bio-oil yield; Lignin; Lignin; Catalytic hydro-pyrolysis; High bio-oil yield; Aromatic hydrocarbon
• ISSN: 1743-9671
• DOI: 10.1016/j.joei.2022.01.011

Catalytic hydro-pyrolysis of lignin has been investigated in the presence of ZSM-5 catalysts. Reaction was carried out at different reaction temperatures (350, 400, 450 and 500 °C) at different reaction holding time at presence of N2 and H2 gas. Non-catalytic pyrolysis was showed maximum bio-oil yield of 31.8 wt% at 450 °C for 60 min reaction condition. While catalytic pyrolysis significantly increased bio-oil yield to 46.8 wt% in presence of ZSM-5 catalyst under 10 bar hydrogen. However, under N2 with ZSM-5 catalyst bio-oil yield showed as 41.8 wt%. Catalytic hydropyrolysis produced higher amount aromatic hydrocarbon (∼49%) compared to the non-catalytic hydropyrolysis. While higher amount of H, G and S-types (Hydroxylphenyl (H), Guaiacyl (G), and Sinapyl (S)) phenols monomer were observed in case of non-catalytic reaction under nitrogen environment. Moreover in the presence of catalysts and hydrogen showed synergistic effects on hydrogenation of bio-oil which is produced BTX (Benzene, Toluene and Xylene) compounds. GPC and elemental analysis of bio-oil was indicated the breaking of lignin macromolecule into lower molecular weight bio-oil. •Catalytic hydro-pyrolysis of Kraft Lignin was investigated.•Maximum bio-oil (46.8 wt%) was obtained with 10 wt% catalyst under H2.•Higher % of aromatic hydrocarbon(s) (49.2%) compounds was obtained.•Catalytic bio-oil showed the higher heating value (HHV) with lower oxygen.