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| Preparation of glycerol carbonate from glycerol catalyzed by magnetic solid base BaFe12O19@(CaO-CaAl12O19) |
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| DOI： |
| KeyWord:glycerol magnetic solid base transesterification BaFe12O19@(CaO-CaAl12O19) |
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| Abstract: |
| BaFe12O19 precursor was obtained by sol-gel method using iron nitrate nonahydrate and barium nitrate as raw materials, and BaFe12O19 was obtained after calcination. BaFe12O19 was impregnated with boehmite sol and dispersed in calcium nitrate tetrahydrate solution and then the magnetic solid base catalyst BaFe12O19@(CaO-CaAl12O19) was synthesized by precipitation method. The catalyst was characterized by magnetic hysteresis loop, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and CO2-TPD. The prepared magnetic solid base catalyst was applied to the transesterification reaction of glycerol and dimethyl carbonate to investigate the effect of different reaction conditions on the yield of the product. The results showed that the catalyst had strong alkali strength and the active site was wrapped evenly and had better magnetic properties. Under the conditions of m(Ca(NO3)2·4H2O)∶?m(BaFe12O19@AlOOH)=5∶?1, reaction temperature 85?℃, reaction time 2.5 h, n(glycerol)∶?n(dimethyl carbonate)=1∶?5 and catalyst dosage 5%, the conversion of glycerol reached 99.43%, and the yield of glycerol carbonate reached 99.38%. |
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