Abstract
Metalloporphyrin catalysts has attracted extensive attention as the result of their outstanding biomimetic catalytic properties. In this paper, different kinds of unsupported (Co(TPP), MnIII(TPP)Cl and CoIII(TPP)Cl) and NaX zeolite supported metalloporphyrin catalysts (Co(TPP)/NaX, MnIII(TPP)Cl/NaX, CoIII(TPP)Cl/NaX) were prepared and characterized. It has been found that these metalloporphyrin catalysts show high catalytic activity in cycloaddition reaction of propylene oxide and carbon dioxide under mild reaction conditions. The NaX supported metalloporphyrin catalysts are more stable and present better catalytic performance than the unsupported metalloporphyrins. CoIII(TPP)Cl/NaX was better than MnIII(TPP)Cl/NaX and CoTPP/NaX, the propylene oxide conversion is 94.5 % and the selectivity to propylene carbonate is 95.6 %. A new kind of supported catalyst Metalloporphyrin/NaX, combined with Phenyltrimethylammonium tribromide was investigated in the cycloaddition of carbon dioxide and propylene epoxide. The results indicate that both a suitable Lewis acid center and base center are necessary for the reaction. A possible mechanism for the reaction was proposed.
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