HYDRODEOXYGENATION OF ETHANOL ORGANOSOLV LIGNIN TO AROMATIC HYDROCARBONS BY METAL ORGANIC FRAMEWORKS

摘要

The chemoselective hydrogenolysis of C-O in ethanol organosolv lignin(EOL)catalyzed by metal-organic frameworks(MOFs)infiltrated with Ni,Cu and Co under mild conditions was achieved in this study.The depolymerization of EOL was processed in the co-solvents of formic acid/water at 200℃ for 8 h with the protection of H2.The efficiency of converting EOL into the hydrocarbons or aromatics depended on the types of catalysts.It increased with the order of Ni-MOF-74 ＞ Cu-MOF-74 ＞ Co-MOF-74 ＞ MOF-74.The converting efficiency as high as 90wt％and the yield of phenols was more than 11wt％.All of the results showed that lignin can be efficiently degraded into aromatic hydrocarbons through the hydrogenation and deoxygenation reaction with MOFs as catalyst.It was also highlighted that MOF-based catalysts were potentially used in the selective cleavage of aryl-ether bonds in lignin and other biopolymers.