Currently, most studies on biomass gasification tend to directly use feedstocks without pyrolysis treatment . However, as discussed in the previous section, pyrolysis potentially increased the specific surface area of carbon materials , thereby contributing to hydrogen production during gasification. To further ascertain the effect of pyrolysis on the gasification syngas, this section compared hydrogen production characteristics from gasification or pyrolysis-gasification of ZMS and two other feedstocks (ADR and AHH). The gasification of the biochar derived from ADR or AHH was performed under identical conditions (gasification at 900 o C with a steam supply of 5 mL/min) as ZMS.