Carbonized MIL−100(Fe) used as support for recyclable solid acid synthesis for biodiesel production

Hui Li, Junchi Wang, Xiaoling Ma, Yangyang Wang, Guoning Li, Min Guo, Ping Cui, Wanpeng Lu, Shoujun Zhou and Mingzhi Yu

Renewable Energy, 2021, vol. 179, issue C, 1191-1203

Abstract: Solid catalyst loss is inevitable by using the traditional separation methods of centrifugation or filtration. To this end, the carbonized MIL−100(Fe) is used to support ammonium sulfate ((NH4)2SO4) for synthesizing magnetic solid acid on the purpose of biodiesel production. Influence of preparation factors of loading amount, activation temperature, and activation time on catalytic activity are initially evaluated. With that, the prepared catalyst (CIS) is comprehensively investigated to obtain the optimal esterification parameters for biodiesel production. Moreover, characterizations of TG, XRD, BET, SEM, EDS, FTIR, py−FTIR, VSM, XPS, and Hammett indicator are conducted to elucidate the structure−function relationship between physicochemical property and catalytic activity. Results indicated the CIS is a superparamagnetism material with the saturated magnetism of 22 emu/g, which could be easily recovered from mixture with external magnet. Furthermore, the maximum conversion of 95.68% is obtained with mild conditions: molar ratio of methanol/oleic acid of 8:1 and catalyst amount of 8 wt% at 70 °C for 2 h. Negligible impact is detected for CIS with presence of 5 wt% water content, even with 20 wt% water content, the conversion of 85.88% is still achieved.

Keywords: Biodiesel; Magnetic catalyst; Acid solid; Reusability; Water resistance (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:179:y:2021:i:c:p:1191-1203

DOI: 10.1016/j.renene.2021.07.122

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