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|Title:||Co-supported hexagonal mesoporous silicas for catalytic oxidation of 4-t-butyltoluene|
|Keywords:||Catalysts;Oxidations;Mesoporous materials;Silica;Cobalt;Impregnation method|
|IPC Code:||Int. Cl.8 B01J21/08; B01J37/02; C07B33/00|
|Abstract:||Co-supported hexagonal mesoporous silicas (Co 2, 4 and 8 wt. %) have been prepared by incipient wetness impregnation, using cobalt acetate tetrahydrate as metal precursors and ethylene glycol as impregnation solvent. The materials have been characterized by XRD, N2 adsorption-desorption isotherms and diffuse reflectance UV-vis spectroscopy. The divalent cobalt with a tetrahedral oxygen exists mainly in the calcined sample with loading Co ≤ 4 wt. %. The Co3O4 particles have been detected in calcined 8 wt. % Co-HMS. The catalytic properties have been tested for oxidation of 4-t-butyltoluene with dioxygen in liquid phase under mild conditions. Co-HMS catalyst (8 wt. %) affords higher yield (17.6%) of 4-t-butylbenzaldehyde at 24.7% conversion in a reaction time of 5 h. The oxides of cobalt, especially Co3O4 particles, are responsible for the partial oxidation of 4-t-butyltoluene. The divalent cobalt ions in tetrahedral environment in the Co-HMS catalysts are unstable during the oxidation reaction.|
|ISSN:||0975-0975 (Online); 0376-4710 (Print)|
|Appears in Collections:||IJC-A Vol.48A(07) [July 2009]|
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