Preparation of the F−-SO42-/MWCNTs catalyst and kinetic studies of the biodiesel production via esterification reaction of oleic acid and methanol
| Autor: | Jiangfan He, Wenqiang Zou, Herry Lesmana, Laixi Zou, Yao Wang, Qing Shu, Caixia Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
060102 archaeology
Renewable Energy Sustainability and the Environment 020209 energy Sulfuric acid 06 humanities and the arts 02 engineering and technology Reversible reaction Catalysis Lewis acid catalysis Reaction rate Oleic acid chemistry.chemical_compound chemistry Biodiesel production 0202 electrical engineering electronic engineering information engineering 0601 history and archaeology Methanol Nuclear chemistry |
| Zdroj: | Renewable Energy. 135:836-845 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2018.12.067 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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