Abstract—Two different Mn-porphyrins; Mn(TPP)OAc (TPP; tetraphenylporphyrin) and Mn(T4PyP)OAc (T4Py; tetra4-pyridylporphyrin) were prepared and their catalytic activities were determined in the epoxidation of alkenes with Oxone® (2KHSO
5.KHSO
4.K
2SO
4). Mn(T4PyP)OAc was then immobilized on multiwalled carbon nanotube (MWCN) as solid support. The catalytic activity and efficiency of the prepated Mn(T4PyP)OAc@MWCN was studied and compared to the other catalysts. Mn(TPP)OAc and Mn(T4PyP)OAc are active than Mn(T4PyP)OAc@MWCN, however the later is more efficient than that that of the others, providing a turnover number of 342 and indicating the resistance of the Mn(T4PyP)OAc@MWCN to auto-degradation. The influence of pH, the nature of the solvent and active intermediate was studied. The molar ratio of catalyst, co-catalyst (imidazole), substrate (alkene) and oxidant were found to be 1: 10: 50: 60 which seem to be the optimal molar amounts for alkene epoxidation. A catalytic cycle is postulated in which the intermediate involves interaction of HSO
5 - with the Mn-porphyrin followed with oxidation of the alkene substrates.
Index Terms—Epoxidation, mn-porphyrin, multiwall carbon nanotube (MWCN).
G. Karimipour is with the Department of Chemistry, Yasouj University,Yasouj 75918-74831, Iran (fax: +98-741-2223048; e-mail: ghkar@yu.ac.ir).
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Cite:G. Karimipour, "Manganese Porphyrin Supported on Multiwalled Carbon Nanotube (MWCN) as Solid Catalyst for Alkene Epoxidation," International Journal of Chemical Engineering and Applications vol. 5, no. 2 pp. 194-197, 2014.
