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|Title:||Selective epoxidation of styrene with air over Co3O4-MOx and CoOx-MOx/SiO2|
|Series/Report no.:||Int. Cl.9 B01J23/00|
|Abstract:||Composite Co3O4-MOx metal oxides prepared by direct calcination are found to be considerably active for the epoxidation of styrene with air in DMF under mild conditions. A substrate conversion of 86.6 mol% with an epoxide selectivity of 79.4% is achieved at 373 K over 15 mg of 10:1 Co3O4-SnOx oxide catalyst, and is superior to other Co3O4-MOx catalysts. After Co3O4-MOx was loaded on the supports like SiO2, Al2O3, MgO or zeolite Y through a simple procedure consisting of wet impregnation/ion exchange, drying and calcination, only 3%Co3O4-1%TiO2/SiO2 behaves as a high-efficiency catalyst. Under identical conditions, 3%Co3O4-1%TiO2/SiO2 catalyzed 76.7 mol% of the styrene conversion with 80.6% selectivity to epoxide, higher than other catalysts. The results showed that many factors affected the performance of the catalysts, such as the molar ratios of Co3O4 to MOx, the loading of cobalt or other metals, the support, the catalyst amount, etc.|
|Appears in Collections:||IJC-A Vol.49A(12) [December 2010]|
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