甲酸原位供氢下碱木质素水热液化实验研究OA

Alkali lignin,a high-volume byproduct generated from pulp and paper manufacturing as well as biomass refining,represents a promising natural feedstock for aromatic hydrocarbon production in liquid fuels owing to its high energy density and abundant aromatic moieties.However,its highly cross-linked polymeric structure hinders its efficient valorization and high-value conversion.In this work,alkali lignin was used as the feedstock to investigate the catalytic conversion into bio-oil under in situ H2 supply from formic acid.A series of Ni-Mo/h-BN bimetallic catalysts with varied metal ratios were synthesized by the impregnation method,and their physicochemical properties were systematically characterized by XPS,XRD and other techniques.The effects of reaction parameters on H2 production via aqueous-phase reforming of formic acid were first evaluated.The optimal H2 yield was achieved at a formic acid-to-water molar ratio of 1∶10 and a Ni/Mo atomic ratio of 3∶1.The H2 yield increased monotonically with temperature in the range of 220-280 ℃,reaching a maximum of 38.48 mmol.Subsequently,the influences of reaction temperature and residence time on bio-oil production from alkali lignin were examined.The highest heavy bio-oil yield(18.93％)and the maximum relative content of aromatic hydrocarbons(13.81％)were both achieved at 280 ℃.Prolonged reaction time reduced the heavy bio-oil yield and the relative abundance of aromatic hydrocarbons,while favoring the formation of furan derivatives.This work demonstrates good synergy and consistency between in situ hydrogen generation from formic acid and lignin hydrogenation in the temperature range of 240-280℃.