首页|Microstructure and morphology of mechanically sulfated acid catalysts of α-Al_2O_3
Microstructure and morphology of mechanically sulfated acid catalysts of α-Al_2O_3
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This work reports the evaluation of the microstructure, morphology, and catalytic behavior of α-Al_2O_3, synthesized via combustion method for esterification reaction of oleic acid in soybean oil with ethanol to produce biodiesel. The reaction was evaluated with 2 wt% of catalyst at 160 °C for 3 h when the molar ratio of fatty acid:ethanol was 1:12. To enhance the catalytic performance of α-Al_2O_3, its sulfation was done by a different method using mechanical milling. The microcatalysts were characterized by X-ray diffraction, Fourie transform infrared spectroscopy, granulometric analysis, and scanning electron microscopy. Results showed α-Al_2O_3 as the major phase, presence of SO_4~(2-) groups, the contribution of the sulfation process to morphology with reduction of agglomerates, and particle size from 18.98 to 15.30 μm. The yield of ester was enhanced from 80% (α-Al_2O_3 as a catalyst) to 93% (SO_4~(2-)/α-Al_2O_3, as a catalyst), which showed the milling as a fast method for synthesis of a highly efficient acid catalyst to produce biodiesel.
catalystsulfationesterificationbiodiesel.
T. K. Oliveira Costa、S. B. F. Santos、C. B. Silva
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Universidade Federal do Rio Grande do Norte, Departamento de Engenharia Quimica, Natal, RN, Brazil
NSTL
