Combustion Synthesis of ZnAl₂O₄ Catalyst Using Glycine as Fuel for the Esterification and Transesterification of Soybean Oil: Influence the Form of Heating

Abstract:

The aim of this work is to evaluate the esterification and transesterification activity of ZnAl₂O₄ catalysts obtained by different ways of heating during the combustion synthesis using glycine as fuel. Samples were prepared according to the propellants and explosives theory using a vitreous silica crucible as container, and as heating source, plate, muffle furnace and microwave oven. After synthesis, the samples were structural and morphologically characterized by: XRD, nitrogen adsorption and carbon content analysis, and employed in the esterification and transesterification reactions, the percentage of biodiesel formed (FAME) was determined by gas chromatography. The samples obtained on the plate, muffle furnace and microwave showed that even using different heating ways, led to the formation of ZnAl₂O₄ as majority phase, with crystallite sizes of 11, 15 and 10 nm, respectively. The samples present values of surface area ranging from 16 to 77 m²/g, particle size from 17 to 81 nm, and carbon content lower than 11%. The forms used for heating influenced the esterification and transesterification reactions, showing that there was a gap in the production of biodiesel, which is a promising indication that this material has potential to be used as catalysts on the biodiesel production.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1323-1328
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1323
• Online since: August 2012
• Authors: Juliana Pimentel Coutinho, Mirele Costa Silva, Simoni Margareti Plentz Meneghetti, Elvia Leal, Ana Cristina Figueiredo de Melo Costa, Normanda Lino de Freitas
• Keywords: Esterification, Transesterification, ZnAl₂O₄

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