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Gasified woody biomass (producer gas) has been converted over a Mo/HZSM-5 catalyst to produce gasoline-range hydrocarbons. The effect of contaminants in the producer gas shows that key retardants in the system include ammonia and oxygen. The production of gasoline-range hydrocarbons derived from producer gas has been studied and compared with the gasoline-range hydrocarbon production from two control syngas mixes. Certain mole ratios of syngas mixes were introduced to the system to evaluate whether or not the heat created from the exothermic reaction could be properly controlled. Contaminate-free syngas composed of 40% H2, 20% CO, 12% CO2, 2% CH4, and 26 % N2 was used to determine hydrocarbon production with similar mole values of the producer gas. Contaminate-free syngas composed of 19% H2, 20% CO, 12% CO2, 2% CH4, and 47 % N2 was also used to test an ideal contaminate-free synthesis gas situation to mimic our particular downdraft gasifier. Producer gas composed of 19% H2, 20% CO, 12% CO2, 2% CH4, 46 % N2, and 1% O2 was used in this study to determine the feasibility of using producer gas to create gasoline-range hydrocarbons. It was determined that after removing the ammonia, other contaminants poisoned the catalyst and retarded the hydrocarbon production process as well. This study was used to determine the feasibility of using raw producer gas to create gasoline-range hydrocarbons with a Mo/HZSM-5 catalyst which is active and selective for the direct synthesis of gasoline-range branched and cyclized alkanes as well as aromatic compounds.