Kinetics for the biodiesel production from lauric acid over Keggin heteropolyacid loaded in silica framework

다국어 초록 (Multilingual Abstract)

Kinetic models were developed to describe the esterification reaction of lauric acid and ethanol overheterogeneous catalysts, which is a reaction of special interest in the biodiesel production. VanadiumKeggin heteropolyacid was included on a silica framework by sol–gel procedure, using different loadings.
The synthesized materials were characterized by FT-IR, XRD, SEM, nitrogen adsorption/desorptionisotherms, and potentiometric titration, and tested as solid catalysts in the esterification of lauric acid.
Best performance was achieved with SiO2@20PMoV, which was used in the esterification of others fattyacid and alcohols. The reuse was successfully tested infive consecutive runs. Kinetic data usingSiO2@20PMoV were obtained at different temperatures (48–78 C), fatty acid:alcohol molar ratios(4 mmol of lauric acid and 2.5, 5, 10 and 15 mL of ethanol), and catalyst amounts (12.5, 25 and 50 mg). Thebest heterogeneous models were LH3 (surface reaction as rate-limiting step) and ER3 (desorption of ethyllaurate as rate-limiting step when the adsorbed reactant is lauric acid). The activation energies were56.1 kJ mol 1 and 64.8 kJ mol 1, and the reaction rate constants at 78 C were 0.2791 mol g 1 h 1 and0.0768 mol g 1 h 1 for LH3 and ER3, respectively.

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