Ionic liquid coupled with nickel salt for enhancing the hydro-liquefaction efficiency of the major biomass components

Qingyin Li, Shu Zhang, Yi Wang, Jun Xiang, Song Hu, Xiangzhou Yuan, Mortaza Gholizadeh and Xun Hu

Renewable Energy, 2021, vol. 175, issue C, 296-306

Abstract: Ionic liquid combined with metal species is considered as a promising catalytic system for biomass liquefaction, which complies with the requirement of green chemistry and promotes utilization of biomass resources. The catalytic systems containing imidazolium-based ionic liquids and nickel chloride were applied to the hydro-liquefaction of major biomass constituents (cellulose, xylan and lignin) in this work. The anion type in ionic liquid played a vital role in the liquefaction of feedstock. The results indicated that the maximum conversion and bio-oil yield were achieved in 1-butyl-3-methylimidazolium bromide ([BMIM]Br)/NiCl2 system, which was attributed to the strong nucleophile and coordinating capacity of bromide ion. The ionic liquid-based catalyst was more effective in the conversion of cellulose and xylan, due to their high reactivity. Additionally, the ionic liquid-based catalyst facilitated the thermal degradation of feedstocks and intermediates, resulting in the increased content of organics with the smaller molecular sizes. The deoxy-hydrogenation reaction was enhanced over ionic liquid-based catalyst, improving the quality of the resulting bio-oils.

Keywords: Biomass; Ionic liquid; Hydro-liquefaction; Bio-oil; Coordination effect (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:175:y:2021:i:c:p:296-306

DOI: 10.1016/j.renene.2021.04.143

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