Preparation of the F−-SO42-/MWCNTs catalyst and kinetic studies of the biodiesel production via esterification reaction of oleic acid and methanol

Qing Shu, Wenqiang Zou, Jiangfan He, Herry Lesmana, Caixia Zhang, Laixi Zou and Yao Wang

Renewable Energy, 2019, vol. 135, issue C, 836-845

Abstract: A novel solid Lewis acid catalyst F−-SO42-/MWCNTs was prepared by impregnating multi-walled carbon nanotubes with sulfuric acid and NaF solution. It was characterized by several techniques. Catalytic activity of F−-SO42-/MWCNTs was evaluated in the esterification reaction of oleic acid and methanol. It exhibited high catalytic activity, giving an oleic acid conversion of 90% when the reaction was conducted with 0.9 wt% catalyst and a methanol/oil molar ratio of 12:1 at 65 °C over 6 h. A kinetic study of F−-SO42-/MWCNTs catalyzed esterification reaction of oleic acid and methanol was implemented after reaction conditions have been optimized, and it was described by the reversible pseudo second-order reaction rate law. Kinetic constant was correlated with the molar ratio of methanol to oleic acid, catalyst concentrations and reaction temperature. Pre-exponential factor (A) and activation energy (Ea) of the positive and reverse reactions of the F−-SO42-/MWCNTs-catalyzed esterification were obtained. The values of A and Ea of the forward reaction were 1.88 L mol−1 h−1 and 32.73 kJ mol−1, and the values of the reverse reaction were 1.90 L mol−1 h−1 and 32.61 kJ mol−1, respectively. The biodiesel product obtained in this study meet the requirements of the ASTM D6751 standard.

Keywords: Biodiesel; Esterification; Solid Lewis acid; Kinetics (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:135:y:2019:i:c:p:836-845

DOI: 10.1016/j.renene.2018.12.067

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