Efficient Catalytic Transfer Hydrogenation of Raw Bio-Oil over Various CuO Catalysts

•CTH upgrading of biomass pyrolysis oil over CuO catalyst in methanol was proposed.•The highest yield of alcohols was achieved of 73.81% at 200 ℃ for 4 h.•The excellent treatment capacity of Cu2Al was 10 vol%.•Cu2Al and CuO/Al2O3 are more stable to produce alcohols.•The reusability of CuO/BC was much lower due to its small average pore size.