Production of Biodiesel from Waste Cooking Oil Using KOH/Al2O3 as a Heterogeneous Catalyst

The catalytic performance of potassium hydroxide supported on alumina (KOH/Al2O3) for transesterification waste cooking oil (WCO) was investigated. XRD, FTIR, and SEM techniques were used to characterize the catalyst after it had been synthesized using wet impregnation method. properties WCO produced biodiesel evaluated. main fatty acids linoleic (45.61%), elaidic (33.86%), palmitic (10.32%), stearic acid (4.80%), value (2.29 mg KOH/g), FFA (1.15%), density at 25 °C (0.91 g/cm3), viscosity 40 (34.09 mm2/s), water content (0.0017%), flash point (206 °C). XRD pattern showed diffraction peaks KAlO2 attributed orthorhombic crystal system having a 12.46% degree crystallinity. micrographs confirmed amorphous nature catalyst. presence K–O Al–O bonds in by FTIR. A yield 86.6% achieved with following variables: methanol ratio 1:4, loading 1.5% (w/v%), reaction temperature 55 °C, time 1 h. results appeared show decreasing 4 cycles from 86.60 51.50%. fuel (0.8919 (7.428 cSt), (65 °C), number (0.54 KOH/g) (0.0196%). Furthermore, prepared have found comply ASTM EN standard specifications. This promising manufacturing low-cost feedstock.