Ethanol-Assisted Hydrothermal Liquefaction of Poplar Using Fe-Co/Al 2 O 3 as Catalyst

Haijun Wu, Usama Shakeel, Quan Zhang, Kai Zhang, Xia Xu and Jian Xu
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Haijun Wu: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China
Usama Shakeel: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China
Quan Zhang: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China
Kai Zhang: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China
Xia Xu: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China
Jian Xu: Biochemical Engineering Research Center, Anhui University of Technology, Ma’anshan 243032, China

Energies, 2022, vol. 15, issue 9, 1-16

Abstract: Although the conversion of lignocellulosic biomass into bio-oil with high yield/quality through hydrothermal liquefaction (HTL) is promising, it still faces many challenges. In this study, a Fe x -Co (1-x) /Al 2 O 3 catalyst was prepared with the coprecipitation method and low-content ethanol was used as the cosolvent for the HTL of poplar. The results showed that the Fe x -Co (1-x) /Al 2 O 3 catalyst significantly promoted the yield and energy recovery rate (ERR) of bio-oil compared with the control (10% ethanol content). At 260 °C for 30 min, 60Fe-40Co/Al 2 O 3 had the best catalytic effect, achieving the highest bio-oil yield (67.35%) and ERR (93.07%). As a multifunctional bimetallic catalyst, Fe x -Co (1-x) /Al 2 O 3 could not only increase the degree of hydrogenation deoxidization of the product but also promote the diversity of phenolic compounds gained from lignin. The bio-oil obtained from HTL with Fe x -Co (1-x) /Al 2 O 3 as catalyst contained lower heterocyclic nitrogen, promoting the transfer of more bio-oil components to substances with lower boiling point.

Keywords: hydrothermal liquefaction; bimetallic cocatalysis; bio-oil; low ethanol ratio; poplar (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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