Oxidative catalytic valorization of industrial lignin into phenolics: Effect of reaction parameters and metal oxides

Oxidative depolymerization of an industrial lignin was performed to study the effect of various metal oxides in oxygen and air atmosphere. CeO2 exhibited excellent catalytic property, and promoted the production of bio-oil yield up to a maximum of 49 wt% in 10 bar O2, whereas 31 wt% bio-oil was noticed in atmospheric air. GC-MS analysis of bio-oil showed that high selectivity towards acetosyringone was observed in the presence of air (70.5 area%) as compared to oxygen (48.1 area%). Herein, we have also applied transitional metals (Co, Mn and Cu) doped CeO2 catalysts. Compared to Cu and Mn, Co metal showed efficient activity that promoted the breaking of labile beta-O-4 linkages via the conversion of C alpha-OH in to carbonyl group in atmospheric air resulting in the formation of acetosyringone up to 78 area%. Moreover, it exhibited excellent catalytic activity up to four successive cycles. Catalyst has been characterized by XRD, BET, TEM, FT-IR and Raman spectroscopy.

Automated summary

The effect of various metal oxides on the oxidative depolymerization of industrial lignin in oxygen and air atmosphere was studied. CeO2 showed excellent catalytic activity, promoting the production of bio-oil yield in both oxygen and air, and high selectivity towards acetosyringone was observed. Transitional metals doped CeO2 catalysts were also applied, with Co metal showing the most efficient activity in atmospheric air resulting in the formation of acetosyringone.