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Synthesis of biodiesel over ZnO/Ca(OH)2/KF catalyst prepared by the grinding method

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Abstract

A novel ZnO/Ca(OH)2/KF solid base catalyst was prepared by the grinding method and applied to biodiesel synthesis by the transesterification of soybean oil. The effect of various parameters such as KF molar amount, calcination temperature, the amount of catalyst, molar ratio of methanol to oil, reaction temperature, and time on the activity of the catalyst were investigated. The catalysts were characterized by several techniques of thermogravimetry/derivative thermogravimetry, X–ray diffraction, Hammett indicator method, and scanning electron microscopy. The analysis results indicated that the KF interacted with Ca(OH)2 and formed KCaF3 phase before calcination of the catalyst. The formed KCaF3 crystal phase was the main catalytic active component for the catalyst activity. In addition, the basicity of ZnO/Ca(OH)2/KF was greatly influenced by the different calcination temperates, and the catalyst activity was correlated closely with the basicity. A desired biodiesel yield of 97.6 % was obtained at catalyst amount of 3 %, methanol/oil of 12:1, and reaction time of 1.5 h at 65 °C.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21176125), the Science Research Project of the Ministry of Education of Heilongjiang Province of China (2012TD012, 12511Z030, 12521594) and the Science Research Project of Qiqihar of China (GYGG–201108).

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Correspondence to Lihua Jia or Xiangfeng Guo.

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Fan, F., Gao, C., Jia, L. et al. Synthesis of biodiesel over ZnO/Ca(OH)2/KF catalyst prepared by the grinding method. Res Chem Intermed 40, 157–167 (2014). https://doi.org/10.1007/s11164-012-0952-8

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  • DOI: https://doi.org/10.1007/s11164-012-0952-8

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