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| Synthesis of glycerol carbonate by transesterification of glycerol catalyzed by Li doped CeO2 solid base |
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| KeyWord:glycerol glycerol carbonate transesterification solid base Li CeO2 |
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| Abstract: |
| Aiming at the problems of complex preparation method and easy loss of active components of catalyst in the transesterification method of preparing glycerol carbonate from glycerol, Li doped CeO2 solid base catalyst was prepared by one pot method. The catalyst was characterized by XRD, SEM, TEM, BET, XPS and CO2-TPD. With conversion rate of glycerol and yield of glycerol carbonate as indexes, the catalyst was screened and the conditions of transesterification of glycerol to prepare glycerol carbonate were optimized by single factor experiment. The reusability of the catalyst was investigated. The results showed that there was a synergistic effect between Li and CeO2, and Li doping could significantly increase the medium and strong base sites of CeO2.When molar ratio of Li, Ce and citric acid was 0.3∶1∶1, the catalyst had the best activity. The optimal reaction conditions were obtained as follows: reaction temperature 100℃, reaction time 2.0 h, catalyst dosage 1% of glycerol mass, and molar ratio of glycerol to dimethyl carbonate 1∶2. Under these conditions, the conversion rate of glycerol was 90.16% and the yield of glycerol carbonate was 90.04%, and the activity of the catalyst did not decrease significantly after reused for five times.Li doped CeO2 solid base catalyst prepared by one pot method has good catalytic performance, and can be used to catalyze synthesis of glyceryl carbonate by transesterification of glycerol. |
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