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| Preparation, characterisation and catalytic transesterification for the preparation of glycerol carbonate of magnetic solid base catalyst K2O/MgFe2O4 |
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| DOI： |
| KeyWord:magnetism K2O/MgFe2O4 transesterification reaction glycerol carbonate |
| FundProject:国家自然科学基金资助项目（21978112） |
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| Abstract: |
| In order to solve the problems of glycerol excess as a by-product in the production process of biodiesel, low yield of glycerol carbonate and difficult recovery of catalyst, with polyethylene glycol 600(PEG-600) as templet and dispersant, magnesium ferrite (MgFe2O4) was prepared by sol-gel method and magnetic solid base catalyst K2O/MgFe2O4 was prepared by impregnation method using MgFe2O4 as the carrier and KNO3 as the precursor of the active component.The catalyst was characterised by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, CO2 procedure temperature rise desorption and magneometer, and the catalytic performance was investigated by using the catalysts in the reaction of transesterification of glycerol with dimethyl carbonate to produce glycerol carbonate. The results showed that the prepared K2O/MgFe2O4 formed K-Fe-Mg bonds, the surface of K2O/MgFe2O4 was mould-like with more medium-strong base sites and strong base sites, and it had good magnetic properties. Under the conditions of PEG-600 addition amount 10 g(Mg(NO3)2 1.5 g, Fe(NO3)3 4.71 g), reaction temperature 105 ℃, reaction time 2 h, catalyst dosage 3%, and the molar ratio of glycerol to dimethyl carbonate 1∶ 2, the conversion rate of glycerol could reach 99.53%, and the yield of glycerol carbonate could reach 96.36%. The prepared catalyst had good reusability, and the yield of glycerol carbonate was still as high as 80.14% after 5 times of reuse. In conclusion, the prepared catalyst has the advantages of high glycerol conversion, high glycerol carbonate yield, and high reusability (easier recovery through an external magnetic field), which is expected to achieve industrialisation. |
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