The catalytic reforming experiments were carried out with different zeolite compositions loaded in the second zone of the reactor. In order to get the quantitative information as well as the effect of catalysts on the product distributions, five kinds of zeolite catalysts were used in this DAPTinhibitor study. Fig. 4 shows the product yields (carbon basis) of volatiles derived from fast pyrolysis of cedar on different zeolite type catalysts at 550 °C. The product yields without catalyst is also shown for comparison in Fig. 4. It is obviously observed that the product yields such as hydrocarbons and aromatics showed higher values in the presence of catalysts. HZSM-5 is more active for promoting the formation of arenes than other zeolite catalysts used. When HZSM-5 was used, the arene yield increased from 4.6 to 26%, while the oxygenated compound yield decreased from 6.6 to 0.3%, in comparison with non-catalytic experiment. The catalyst Y-type-2 (SiO2/Al2O3 = 400) showed lower aromatic yield than any other catalysts. The yield of aromatics for the different zeolite catalysts is in the order of HZSM-5 > mordenite > Y-type-1 > β-type > Y-type-2. Fig. 4. also reveals that the catalyst Y-type-2 is less effective in converting the oxygenated compounds than any other zeolite catalysts.