الفهرس 
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Abstract
The development of biofuels resources has received great attention because of the global environmental concern and the exhaustion of the fossil fuel resources. Thermal catalytic Cracking and hydro catalytic cracking of waste cooking oils to obtain biofuel is a potential processing routes. This study investigated the preparation of catalyst Co/Zn-Al2O4, CoAl2O4, ZnAl2O4 Nano particles by co-precipitation method using ammonia as a precipitating agent and then use it in biodiesel fuel synthesis by Thermal catalytic cracking, hydro catalytic cracking of waste cooking oil (WCO). Using Stainless-steel autoclave reactor and hydro catalytic cracking of WCO using a continuous high pressure micro- reactor (cata- test unit). This catalyst was approved and characterized by Energy dispersive X- ray analysis (EDX), X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET), Fourier transform infrared (FTIR), High-resolution transmission electron microscopy (HRTEM) , Scanning Electronic Microscopy Image (SEM) analysis. The parameters affecting the cracking process such as Catalyst dose, duration time, Temperature, hydrogen pressure and feed rate of WCO were optimized. The cracked products were characterized by fractional distillation. The results of fractional distillation show good catalyst higher selective activity to bio hydrocarbon in rang of naphtha, kerosene and diesel compared to fractional distillation of WCO. Different blends of kerosene cuts, diesel cuts (biofuel) was blended with fossil fuel cuts and characterized as a DROP in fuel, then characterized according to the different ASTM methods.