is a practical technique because it allows for the high conversion of solid feedstocks such as biomass and coal into gas [8]. However, there have been very few reports on the co-gasification of the woody biomass and coal with air and steam from the viewpoint of the supply of syngas for the synthesis of liquid fuels, i.e. from the viewpoint of the molar ratio of H2, CO and CO2 in the product gas [9,10]. In addition, there also have been very few reports on the
co-gasification with varying content of biomass and coal in a wide range.