Abstract
The magnetic CsH2PW12O40/Fe–SiO2 nanocatalysts were prepared via combination of sol–gel and impregnation methods. The effects of different H3PW12O40/(Fe–SiO2) weight percentage, loading of Cs as a promotor and calcination conditions on the catalytic performance has been studied. It was found that the catalyst with H3PW12O40/Fe–SiO2=4wt.% and Cs=2wt.% is an optimal catalyst for biodiesel production. The activity of optimal catalyst was studied in different operational conditions. The best operational conditions were CH3OH/oil=12/1 at 60°C with mechanical stirring rate of 500rpm and the biodiesel yield reaches to 81% in 4h. Characterization of catalysts was carried out by using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), vibrating sample magnetometry (VSM), N2 adsorption–desorption measurements methods, Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC).
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