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| ffect of metal modification on titanium silicalite TS-1 for methyl oleate epoxidation |
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| DOI： |
| KeyWord:methyl oleate epoxidation titanium silicalite TS-1 metal modification |
| FundProject:湖南省自然科学基金面上项目（2021JJ30289） |
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| Abstract: |
| Epoxy vegetable oil has widely utilized as various chemical material. To improve the activity of titanium silicalite TS-1, a vegetable oil epoxidation catalyst, a series titanium silicalite TS-1 supported various metals catalysts (M/TS-1, M=Mn, Fe, Cu, Mg) were prepared by a deposition-precipitation method and characterized. The effect of metal modification on the epoxidation performance of methyl oleate on TS-1 was investigated using the epoxidation of methyl oleate as a probe reaction.The results showed that the introduction of Fe and Cu into TS-1 promoted the catalytic activity but Mg and Mn modification inhibited the methyl oleate conversion, and Cu/TS-1 catalyst showed the highest catalytic activity. Combined with various characterization results, the high activity of Cu/TS-1 catalyst was attributed to the introduction of Cu, which effectively changed the electronic environment of Ti active center and added new medium and strong acidic sites. The optimal process conditions for Cu/TS-1 catalyzed epoxidation of methyl oleate were obtained as follows: reaction temperature 80 ℃, molar ratio of H2O2 to methyl oleate 3∶ 1, mass ratio of methyl oleate to catalyst 10∶ 1-20∶ 1. The conversion of methyl oleate and the yield of epoxy oleic methyl ester were slightly reduced after Cu/TS-1 was repeated for 5 times. In summary, TS-1 modified by Cu can significantly improve its catalytic activity and Cu/TS-1 has good regeneration performance. |
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