Catalytic upgrading of syngas from fluidized bed air gasification of sawdust

► Syngas was upgraded to form more H2 via a secondary catalytic reactor. ► H2 promotion ratios were strongly dependent on the condensable products. ► The contaminants were reduced when passed through a secondary catalytic reactor. ► The amounts of condensable products were correlated with the gasification temperature. ► The process of biomass gasification could occur under very mild conditions.