In this study, we performed the depolymerization reaction of concentrated sulfuric acid hydrolysis lignin (CSAHL) in supercritical ethanol without supplying external hydrogen. Cu demonstrated the highest monoaromatic yield of 18.4 wt% among Co, Ni and Cu when incorporated into MgAlOy. With increasing the amount of Cu loading, it was found that the optimum Cu loading was 30 wt%, where the number of acid sites had the maximum. In case of CuO–MgAlOy sample with higher Cu loading than 30 wt%, the decrease in the acid sites and the significant sintering of Cu metal during reaction were observed, leading to the decline in the monoaromatic yield.
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This work was supported by the New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20143030090940).