Carbonization behavior of the mixture of woody biomass and black liquor was investigated. By means of co-pyrolysis of cedar and black liquor, the evolved amount of tar and H2O was depressed by the effect of sodium compounds. As a result, H2 gas evolved increased, the amount reached 1/3 of the total content of hydrogen atom included in biomass and the evolution peak shifted to the 450 °C, being ca. 300 °C lower than that by cedar pyrolysis.
