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The catalytic behaviour in the liquid phase and in the gas phase ammoximation of cyclohexanone on amorphous silicas containing different amounts of titanium has been investigated. The silicas were prepared by impregnation and the sol-gel method. The behaviour of the silicas with and without titanium was different in the liquid and gas phases. The presence of titanium sites was found to be essential...
The catalytic behaviour in the ammoximation reaction of cyclohexanone to cyclohexanone oxime and the presence of activated forms of molecular oxygen on different commercial silicas (Akzo F-7, Degussa A200, Cabosil) was investigated. The presence of O 2− species in the same range of temperature at which the silicas are active in ammoximation reaction was detected. The investigated silicas...
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