Biomass gasification is a promising alternative to produce renewable hydrogen as a clean fuel or renewable syngas for sustainable chemical industry.Of all the thermo-chemical process,however,biomass gasification still suffers from lower hydrogen production and higher tar formation comparing to the process from fossil fuels.Recently,biomass catalytic gasification greatly increased yield and decreased tar formation.One significant challenge for catalytic gasification is the fast deactivation of catalysts due to coke formation and sintering,which limits the application of catalytic gasification in emerging bio-refining industry.In this research,nano Fe-Zn/Al2O3 catalysts have been prepared for the catalytic gasification of sawdust with steam.Through characterization,it was found that Fe and Zn were well distributed on the surface with the particle size around 12-46nm.During the gasification,the yield of hydrogen was increasing with the ratio of Zn,as Zn is an efficient metal promoter for enhancing the performance of Fe active site in the reaction.The optimal H2 yield and the H2/CO ratio(ca.2)were obtained on the 20%Fe/Al2O3 catalyst with Zn/Al ratio of 1:1.All catalysts showed ultra-high stability during the gasification and nearly no coke and sintering have been observed on the used catalysts.Obviously,these nano-catalysts prepared from natural-abundant and low-cost metals have the targeting catalytic properties for biomass gasification and are promising for the further application.