Fabrication of silicotungstic acid immobilized on Ce-based MOF and embedded in Zr-based MOF matrix for green fatty acid esterification

Abstract In the present study, a facile solvothermal method was used for synthesis of silicotungstic acid (HSiW) immobilized on Ce-based metal organic framework (Ce-BDC) and embedded in Zr-based metal-organic (UiO-66(Zr)) composite catalyst, namely, Ce-BDC@HSiW@UiO-66 production biodiesel through green fatty esterification. The obtained hybrids were characterized by various characterization technologies, including Fourier transform infrared, X-ray diffraction, scanning electron microscopy, transmission N 2 physisorption, photoelectron spectroscopy, temperature-programmed desorption NH 3 (NH -TPD) analysis. analyses showed that have been successfully synthesized. Also, volume pore size UiO-66(Zr) changed introducing HSiW@Ce-BDC, resulting possessed mesoporous structure relatively high surface area. Simultaneously, -TPD analysis reveals strength increased comparison with HSiW@Ce-BDC. addition, demonstrated catalytic activity, oleic esterification gave 81.5% conversion at optimum conditions 0.2 g catalysts, 1:30 to methanol molar ratio 130°C 4 h. More interestingly, after six recycling cycles, reduction rate only 4.6%, indicating has excellent reusability. Our study provides an effective approach synthesize multifunctional biofuel production.