Hydrogenolysis of lignin into phenols over a high dispersed Pd supported on WO2.72OA

The depolymerization of lignin into aromatic monomers with high yield is the bottleneck of high valued utilization of lignin.In this work,a highly dispersed Pd supported on WO2.72(Pd/WO_(2.72))catalyst was prepared for efficient hydrogenolysis lignin.The highly dispersed Pd,high specific surface area,high content of acidic sites,and hydrogen spillover of Pd/WO_(2.72) improved the depolymerization efficiency of lignin.In addition,the depolymerized products were alkylated with the reaction solvent to prevent monomers from re-polymerizing,thus further enhancing aromatic monomers yield.Under 320℃,6 h,bio-oil and aromatic monomers yield reached 77.67 wt%and 28.80 wt%,respectively.Among the aromatic monomers,the tert-butyl group substituted products accounted for 65.71%,of which 77.1%were methoxy-free phenols.It was found that the bio-oil had a calorific value of 38.13 MJ/kg and an IC_(50) value of 43 mg/L,showing their potential applications as fuels or antioxidant additives.