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| Synthesis of glycerol carbonate by transesterification of glycerol catalyzed with magnetic solid base K2O/LDO-γ-Fe2O3 |
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| DOI： |
| KeyWord:K2O/LDO-γ-Fe2O3 magnetic transesterification glycerol glycerol carbonate |
| FundProject:国家自然科学基金资助项目（21978112） |
| Author Name | Affiliation | | ZHANG Xin, CHEN Yifeng, ZHANG Pingbo, FAN Mingming, LENG Yan, JIANG Pingping | Key Laboratory of Synthetic and Biological Colloids of Ministry of Education, School of Chemical and
Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu,China |
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| Abstract: |
| In order to solve the problems of the low yield of glycerol carbonate synthesized with glycerol and the recovery of the catalyst after the reaction, the magnetic hydrotalcite LDH-Fe3O4 was prepared and modified by KNO3 as the active component precursor to prepare magnetic solid base catalyst K2O/LDO-γ-Fe2O3.The KNO3 loading amount of the catalyst was studied.The K2O/LDO-γ-Fe2O3 was characterized by X-ray diffraction, scanning electron microscopy, CO2-TPD, BET and magnetization intensity. The process conditions of the K2O/LDO-γ-Fe2O3-catalyzed transesterification of glycerol for the synthesis of glycerol carbonate were optimized using single factor experiment. The reusability of K2O/LDO-γ-Fe2O3 was investigated. The results showed that KNO3 provided a large number of alkaline sites, which facilitated the catalytic activity of the catalyst,and the optimal loading amount was 10%(based on the mass of LDH-Fe3O4). The saturation magnetization intensity of K2O/LDO-γ-Fe2O3 was 10.47 emu/g. The optimal transesterification conditions were as follows: reaction temperature 100 ℃, reaction time 2 h, catalyst dosage 3%(based on the mass of glycerol), and molar ratio of glycerol to dimethyl carbonate 1∶ 2. Under the optimal conditions, the glycerol carbonate yield was 92.12%. The yield of glycerol carbonate reached 89.35% after five repetitions of the catalyst. The K2O/LDO-γ-Fe2O3 catalytic reaction time was shorter and the amount of reaction reagent was less than that of Mg-Al hydrotalcite. In conclusion, the magnetic catalyst prepared is magnetic and can be separated from the reaction system under the action of an applied magnetic field, and can maintain high activity in several cycles with reduced economic costs,and has a good application prospect in industrial production of glycerol carbonate. |
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