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Nanostructured sodium–zeolite imidazolate framework (ZIF-8) doped with potassium by sol–gel processing for biodiesel production from soybean oil

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Abstract

Zeolite imidazolate framework (ZIF-8) doped with potassium (KNa/ZIF-8) was prepared under hydrothermal conditions. FTIR, powder XRD, scanning electron microscopy, N2 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.

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Acknowledgments

We gratefully thank Shahreza Branch, Islamic Azad University, for financial support.

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Authors and Affiliations

  1. Department of Chemistry, Shahreza Branch, Islamic Azad University, Shahreza, 86145-311, Iran

    Mandana Saeedi, Razieh Fazaeli & Hamid Aliyan

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  1. Mandana Saeedi
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  2. Razieh Fazaeli
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  3. Hamid Aliyan
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Correspondence to Razieh Fazaeli.

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Saeedi, M., Fazaeli, R. & Aliyan, H. Nanostructured sodium–zeolite imidazolate framework (ZIF-8) doped with potassium by sol–gel processing for biodiesel production from soybean oil. J Sol-Gel Sci Technol 77, 404–415 (2016). https://doi.org/10.1007/s10971-015-3867-1

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  • DOI: https://doi.org/10.1007/s10971-015-3867-1

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