Abstract
The catalytic efficiency of modified tetraphenylporphyrins with various metals (Mn, Fe, Co, Ni and Zn) and different electron-donating substituents (–OCH3, –OH, –N(CH3)2, –SO3Na) at the phenyl para-positions using hydrogen peroxide (H2O2, 30 wt%) as the oxidant has been researched in the epoxidation of unsaturated fatty acid methyl esters (FAMEs) under mild conditions. In the present system, the co-catalyst effect of inorganic salts had a crucial role in enhancing catalytic performance. According to the yields, the catalytic activities of metalloporphyrins were in the following order: Mn(TPP)Cl ≈ Fe(TPP)Cl > CoTPP > NiTPP > ZnTPP, and Mn(TPP)Cl > Mn(TMOPP)Cl ≈ Mn(THPP)Cl > Mn(TDMPP)Cl > Mn(TPPS4)Cl. Moreover, metalloporprhyrins after modification by electron-donating substituents displayed promoted thermolysis temperatures. Remarkably, the formation of intermediate porMnV=O has also been indicated, which was verified by both a kinetic study of FAMEs epoxidation and UV–Vis spectroscopy.
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Acknowledgments
This work was supported financially by the National “Twelfth Five-Year” Plan for Science & Technology (2012BAD32B03), the National Natural Science Foundation of China (20903048) and the Innovation Foundation in Jiangsu Province of China (BY2013015-10).
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Zhang, W., Jiang, P., Wu, J. et al. Catalytic epoxidation of fatty acid methyl esters by modified metalloporphyrins with variable metals and electron-donating substituents. Reac Kinet Mech Cat 112, 147–158 (2014). https://doi.org/10.1007/s11144-014-0676-4
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DOI: https://doi.org/10.1007/s11144-014-0676-4