Valorization of walnut shell ash as a catalyst for biodiesel production
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AuthorsMiladinović, Marija R.
Krstić, Jugoslav B.
Banković Ilić, Ivana B.
Veljković, Vlada B.
Stamenković, Olivera S.
Article (Published version)
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The catalytic activity of the walnut shell ash was investigated in the biodiesel production by the sunflower oil methanolysis. The catalyst was characterized by the TG-DTA, XRD, Hg porosimetry, N2 physisorption, SEM, and Hammett method. In addition, the effects of the catalyst loading and the methanol-to-oil molar ratio on the methyl esters synthesis were tested at the reaction temperature of 60 °C. The walnut shell ash provided a very fast reaction and a high FAME content (over 98%). As the reaction occurred in the absence of triacylglycerols mass transfer limitation, the pseudo-first-order model was employed for describing the kinetics of the reaction. The catalyst was successfully reused four times after the regeneration of the catalytic activity by recalcination at 800 °C.
Keywords:walnut shell / sunflower oil / methanolysis / kinetics / biodiesel / ash
Source:Renewable Energy, 2019, 147, 1033-1043
- Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)
- Project 0-14-18 of the SASA Branch in Niš, Serbia