Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 77, Issue 2, Pages 404-415Publisher
SPRINGER
DOI: 10.1007/s10971-015-3867-1
Keywords
Biodiesel; Vegetable oil; Potassium-doped catalyst; Zeolite imidazolate framework (ZIF-8)
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Funding
- Shahreza Branch, Islamic Azad University
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Zeolite imidazolate framework (ZIF-8) doped with potassium (KNa/ZIF-8) was prepared under hydrothermal conditions. FTIR, powder XRD, scanning electron microscopy, N-2 physisorption and TGA were used to characterize synthesized catalysts. Furthermore, biodiesel was synthesized using soybean oil as the feedstock by KNa/ZIF-8-catalyzed transesterification process. In order to increase the basicity and consequently improve the performance of ZIF-8 in the transesterification of soybean oil with methanol, sodium and potassium were added to it. The effect of various reaction parameters, including methanol/oil molar ratio, reaction, catalyst mass and temperature on the reaction, was studied. Using KNa/ZIF-8 and methanol/oil molar ratio of 10:1 over a period of 3.5 h afforded a remarkable conversion of > 98. The solid catalyst can be recycled least three times under mild conditions. KNa/ZIF-8 demonstrated higher activity in the transesterification of soybean oil compared with Na and K (as dopant) modifications on the conventional support (SiO2) and other MOF (MIL-101 and MIL-100) materials. [GRAPHICS] .
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