Biodiesel production from waste cooking oil using a new heterogeneous catalyst SrO doped CaO nanoparticles

Biodiesel production from waste palm cooking oil (WPCO) was studied. Calcium oxide with a strontium ion additive (Sr-CaO) employed as catalyst in transesterification reaction of used methanol. The Sr-CaO synthesized by co-precipitation method between SrCl2 and Ca(NO3)2, then calcined at 900°C for 5 h. characterized using thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR). morphology elements content Sr Ca the were confirmed SEM-EDX. approximate diameter is 12.6±5.9 µm. highest conversion 99.33% (the time 3 h, 5%w/w catalyst, methanol to molar ratio 9:1 temperature 80°C). can be up sixth cycles good yield. biodiesel meet requirement standard (EN 14103 ASTM D445). These findings suggest that calcium an effective renewable catalyst.