NOVELTY - Biomass pyrolysis catalyst composition (I) comprises: (A) support particles; and (B) metallic catalyst particles adhered to the surface of the support particles, where the metallic catalyst particles comprise an alloy comprising at least two different metals, the metallic catalyst comprises 30-70 wt.% of (I) and the average particle size of the metallic catalyst particles is 1-250 nm.    USE - (I) is useful for improving the biomass pyrolysis and/or biomass gasification process, which is useful for producing bio-oils or syngas for transportation, electrical production and other industries.    ADVANTAGE - (I) is cost effective and environmentally friendly, and provides higher gas and liquid yields, and reduced solid yields including reduced tar and lignin content.    DETAILED DESCRIPTION - Biomass pyrolysis catalyst composition (I) comprises: (A) support particles; and (B) metallic catalyst particles adhered to the surface of the support particles, where the metallic catalyst particles comprise an alloy group of formula ((Aa)n (Bb)n (Cc)n), the alloy comprises at least two different metals, the metallic catalyst comprises 30-70 wt.% of (I) and the average particle size of the metallic catalyst particles is 1-250 nm. INDEPENDENT CLAIMS are included for:    (1) either reducing the amount of carbon dioxide or char formed during biomass pyrolysis comprising: (a) providing biomass material, and (b) providing (I), before or during a pyrolysis reaction, contacting the biomass material with (I) at a temperature of up to 800 degrees C, where less carbon dioxide or char results from the pyrolysis reaction as compare with the same reaction without the presence of (I); and    (2) forming a higher ratio of carbon monoxide to carbon dioxide during biomass pyrolysis comprising the steps (a)-(b) as above per se, where the resulting ratio formation of carbon monoxide to carbon dioxide is higher as compared with the same pyrolysis reaction without the presence of (I).    A-C = a metal;    a-c = compositional stoichiometry; and    n = greater than or equal to 0, the sum of the n's is greater than or equal to 2.