Potassium supported on zeolite-geopolymer hybrid materials as a new solid base catalyst for transesterification of soybean oil

Natkanin Supamathanon, Kornkanok Boonserm, Nattawut Osakoo, Jatuporn Wittayakun, Sanchai Prayoonpokarach, Narong Chanlek and Winya Dungkaew

Renewable Energy, 2023, vol. 202, issue C, 1460-1469

Abstract: The heterogeneous base catalysts were developed from zeolite-geopolymer hybrid material (Zeo-Geo) as a new support for potassium in transesterification of soybean oil. Zeo-Geo was prepared by mixing Al metal, metakaolin, and fumed silica in NaOH solution and curing at 60 °C, 24 h and 110 °C, 12 h. The Zeo-Geo contained a mixed phase of geopolymer and X-type zeolite. The xK/Zeo-Geo with x = 5, 10 or 15 wt% potassium were prepared by impregnation of Zeo-Geo with potassium acetate followed by calcination at 400 °C for 3 h. The phases of potassium were mainly K2O and K2CO3 and the basicity increased with potassium loading. The 15K/Zeo-Geo was the most active catalyst in transesterification of soybean oil with methanol, at 70 °C providing 97.64% biodiesel yield under the optimum condition: reaction time = 3 h, methanol to oil molar ratio = 16:1 and catalyst amount = 2 wt%. The catalyst was reused in 5 cycles without a significant activity loss and leaching of active species. From this study, 15K/Zeo-Geo has a potential for further development in large-scale production.

Keywords: Transesterification; Potassium; Heterogeneous catalyst; Zeolite-geopolymer hybrid materials (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:202:y:2023:i:c:p:1460-1469

DOI: 10.1016/j.renene.2022.12.018

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