In this study slow catalytic pyrolysis of Phoenix dactylifera(date palm seeds) was investigated in fixed bed reactor in the presence of doped ZnO/MgOnanoparticles. These NPs were prepared by using homogenous precipitation method. The effect of catalytic dosage of doped ZnO/MgO and ZSM-5 was studied on the conversion of biomass into pyrolysis products. By using doped ZnO/MgO the production of bio oil was increased, further increasing reduced bio oil yield. ZSM-5 caused slight increase in the yield of bio oil. The yields of bio char and syn-gas were also affected by variable dosage of catalyst.