Research is being carried out to evaluate different nickel supported Zeolite-Y catalysts for tar destruction. Nickel supported Y-Zeolites with different SiO2/Al2O3 ratios (5.2, 30, 80) were tested to evaluate the effect of catalyst acidity on tar removal in the temperature range of 550-750 OC. Also, nickel supported on Silica/Alumina catalyst was prepared and tested. Catalyst characterization was performed using XRD, BET, and SEM on the catalysts evaluated. Tests were carried out on a laboratory scale flow reactor with naphthalene as a tar model compound. The results of these experiments showed that Ni on Zeolite-Y had better naphthalene removal efficiencies compared with Silica/Alumina catalyst, which could be attributed to the higher surface area and acidity of the zeolite. Also, the acidity of the zeolite support had a significant effect of naphthalene removal efficiencies. Removal efficiencies decreased with an increase in the acidity of the catalyst. This could be due to the formation of coke and NiAl2O4, which was confirmed by the TGA and XRD analysis. Tests were also carried out to evaluate the effect of varying nickel loading on zeolite, naphthalene loading, steam to carbon ratio, and gas hourly space velocity, the results of which will be presented.