Journal
FUEL PROCESSING TECHNOLOGY
Volume 106, Issue -, Pages 102-107Publisher
ELSEVIER
DOI: 10.1016/j.fuproc.2012.07.008
Keywords
Biodiesel; Transesterification; Waste frying oil; Zinc aluminate
Funding
- CNPq-Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, of the Ministry for Science and Technology of Brazil
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The transesterification of waste frying oil (WFO) with methanol and ethanol was studied in a batch reactor using a zinc aluminate catalyst prepared by the combustion reaction method. The reaction runs were carried out for 2 hours, using alcohol:oil molar ratio of 40:1, temperature range of 60-200 degrees C, catalyst ratio of 1-10% wt., under 700 rpm stirring. The catalyst was characterized by XRD, EDX, TG, FTIR, N-2 physisorption, NH3- and CO2-TPD. The catalyst showed a normal spinel structure and acid character (Lewis acid), in spite of the presence of both strong acid and base sites. Methyl and ethyl esters yields higher than 95% were obtained at 150 and 200 degrees C and the catalyst was recovered and reused in 3 reaction cycles, without significant loss of activity. (c) 2012 Elsevier B.V. All rights reserved.
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