| Summary: | 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<sub>x</sub>-Co<sub>(1-x)</sub>/Al<sub>2</sub>O<sub>3</sub> 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<sub>x</sub>-Co<sub>(1-x)</sub>/Al<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> had the best catalytic effect, achieving the highest bio-oil yield (67.35%) and ERR (93.07%). As a multifunctional bimetallic catalyst, Fe<sub>x</sub>-Co<sub>(1-x)</sub>/Al<sub>2</sub>O<sub>3</sub> 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<sub>x</sub>-Co<sub>(1-x)</sub>/Al<sub>2</sub>O<sub>3</sub> as catalyst contained lower heterocyclic nitrogen, promoting the transfer of more bio-oil components to substances with lower boiling point.
|
|---|