Abstract
AbstractBiodiesel was synthesized by transesterification of soybean oil and methanol over a silica‐supported morpholine alkaline ionic liquid catalyst (SILC). Characterization of SILC was performed using 1H‐nuclear magnetic resonance (1H‐NMR), Fourier‐transform infrared spectroscopy (FT‐IR), x‐ray diffraction, thermogravimetric analysis (XRD), and nitrogen adsorption‐desorption isotherms. Transesterification proceeded satisfactorily over SILC at ambient pressure and without simultaneous water removal. Under optimal reaction conditions, including 60°C, 4 hours, reactant/catalyst molar ratio of 14/1, and 3‐wt% catalyst, a high yield of biodiesel (94.5%) was obtained. SILC's reusability was more than six times, with no obvious decrease in catalytic activity observed.
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