Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 379, Issue -, Pages 234-242Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2013.08.027
Keywords
Spinels; ZnFe2O4; Biodiesel; Transesterification; Vegetable oils
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Crystalline mixed oxides of AB(2)O(4) composition, where A = Co, Ni, Cu and Zn and B = Al, Fe and Co, were prepared by co-precipitation of hydroxides and calcination at 873 K. The catalytic activity of these materials in the transesterification of sunflower oil with methanol to produce fatty acid mono esters (FAME; biodiesel) was investigated. The transesterification activity was found to depend on element A, the order of activity being: Zn > Cu > Ni > Co. The Zn containing spinels were more active than the others and their activity was found to go through a maximum with Sanderson's intermediate electronegativity. Detailed investigations carried out on ZnFe2O4 revealed it to be a suitable solid catalyst for the transesterification of used cooking oil and jatropha oil. The catalyst was reusable many times. The performance of this spinel was also investigated in a bench-scale (30g catalyst loading) fixed-bed reactor. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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