Thermogravimetry study of the ester interchange of sunflower oil using Mg/Al layered double hydroxides (LDH) impregnated with potassium |
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| Authors: | Ana C F Coriolano Aline A Alves Renkel A Araujo Regina C O B Delgado Florival R Carvalho Jr" target="_blank">Valter J FernandesJr Antonio S Araujo |
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| Institution: | 1.Potiguar University, Laureate International University,Natal,Brazil;2.Institute of Chemistry,Federal University of Rio Grande do Norte,Natal,Brazil;3.Department of Environment and Technology Science,Federal Rural University of Semi-Arid,Mossoro,Brazil;4.Department of Chemical Engineering,Federal University of Pernambuco,Recife,Brazil |
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| Abstract: | Mg/Al layered double hydroxides (LDH) containing KI were synthesized and tested as basic heterogeneous catalysts for transesterification of sunflower oil, in order to obtain biodiesel. The process was carried out using reflux with 15:1 molar ratio of methanol to sunflower oil, and catalyst concentration of 2 mass%. The characterization of sunflower oil and biodiesel was accomplished according to ASTM and EN standard methods. The gas chromatographic and TG/DTG profiles were evaluated, and the results of yield and conversions were compared. The gas chromatographic analysis showed that the catalysts were effective in converting vegetable oil into biodiesel, specially using LDH catalysts modified with KI and molar ratio Mg/Al = 1, with conversions higher than 99 % indicating the strong influence of the chemical composition and controlled basicity, due to the presence of potassium in the structure of the catalyst. |
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