NOVELTY - A composition (C1) comprises: a biomass; and a nanoalloy catalyst containing a support material and at least one metal-containing compound.    USE - For biomass gasification; for producing syngas from biomass gasification; and for producing stabilized bio-oil from biomass gasification (all claimed).    ADVANTAGE - The composition improves the efficiency and output of a biomass gasification process; achieves very high biomass gasification conversion efficiency (preferably up to or over 85% gas product); provides cracking of any biomass lignin at relatively low biomass gasification temperatures; provides increased gas yields and lower lignin content in the resulting product relative to conventional gasification; reduces the energy input to the gasification; reduces costs and the environmental impact associated with the gasification process; and reduces solid yield (such as reduced tar and lignin) and liquid yield.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for following:    (1) method (M1) for biomass gasification involving contacting a biomass with a dual catalyst containing a volatile organometallic compound and a nanoalloy; and gasifying the biomass at a gasification temperature of 300-800 degrees C;    (2) producing syngas from biomass gasification involving contacting a biomass with a volatile organometallic compound and nanoalloy before or during gasification; gasifying the biomass; and producing a syngas having a H2:CO mole ratio of at least 2:1;    (3) producing (M2) stabilized bio-oil from biomass gasification, involving gasifying a biomass; producing hydrogen and a bio-oil from the gasification of the biomass; introducing the bio-oil to a hydrogenation reactor downstream; operating the hydrogenation reactor with at least a portion of the hydrogen produced by the gasification of the biomass; and the operation of the hydrogenation reactor passivating the oil product against reactions that contribute to viscosity increase during storage.