In situ hydrogenation is a novel method for hydrogenating complex
chemical compounds. Liquid hydrogenation donors
were used during the hydrogenation process instead of hydrogen
gas. Tan and Fisk used acids as hydrogenation donors
for hydrogenating bio oil model compounds and raw bio-oil. But
the study on the effects of the coupling and the application for in
situ hydrogenation are still lacking. Ford investigated the
approach to disassembling biomass-derived lignin in supercritical
methanol over Cu-doped porous metal oxide catalyst. The hydrogen
generated from methanol transferred to the organosolv lignin.