Production of biodiesel by esterification of palmitic acid over mesoporous aluminosilicate Al-MCM-41
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Data
2009-03-01
Autores
Carmo, Alipio C.
de Souza, Luiz K. C.
da Costa, Carlos E. F.
Longo, Elson [UNESP]
Zamian, Jose R.
da Rocha Filho, Geraldo N.
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Editor
Elsevier B.V.
Resumo
Biodiesel has been obtained by esterification of palmitic acid with methanol, ethanol and isopropanol in the presence of Al-MCM-41 mesoporous molecular sieves with Si/Al ratios of 8.16 and 32. The catalytic acids were synthesized at room temperature and characterized by atomic absorption spectrometry (AAS), thermal analysis (TG/DTA), X-ray diffraction (XRD), nitrogen absorption (BET/BJH), infrared spectroscopy (IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The reaction was carried out at 130 degrees C whilst stirring at 500 rpm, with an alcohol/acid molar ratio of 60 and 0.6 wt% catalyst for 2 h. The alcohol reactivity follows the order methanol > ethanol > isopropanol. The catalyst Al-MCM-41 with ratio Si/Al = 8 produced the largest conversion values for the alcohols studied. The data followed a rather satisfactory approximation to first-order kinetics. (C) 2008 Elsevier Ltd. All rights reserved.
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Palavras-chave
Mesoporous, Molecular sieves, Acid catalysts biodiesel, Esterification
Como citar
Fuel. Oxford: Elsevier B.V., v. 88, n. 3, p. 461-468, 2009.