Production of biodiesel by esterification of palmitic acid over mesoporous aluminosilicate Al-MCM-41 |
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| Authors: | Alí pio C. Carmo Jr.,Carlos E.F. da Costa,José R. Zamian |
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| Affiliation: | a Universidade Federal do Pará (UFPA), Instituto de Ciências Exatas e Naturais, Faculdade de Química, Laboratório de Catálise e Oleoquímica, 66075-110 Belém, PA, Brazil
b Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Instituto de Química de Araraquara, Departamento de Bioquímica e Tecnologia Química. 14801-907 Araraquara, Caixa-Postal: 355 SP, Brazil |
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| Abstract: | 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 °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. |
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| Keywords: | Mesoporous Molecular sieves Acid catalysts biodiesel Esterification |
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