Ammoximation of cyclohexanone over a titanium silicate molecular sieve, TS-2

Abstract

The catalytic activity and selectivity of the titanium silicate molecular sieve, TS-2 (having ZSM-11 structure), in the ammoximation of cyclohexanone and other carbonyl compounds with H,Oa and NH, is reported in this paper. The studies were carried out at dilferent temperatures and reactant concentrations and with different catalysts. TS-2 produces cyclohexanone oxime with high selectivities, while silicalite-2 and SiO, produce large quantities of the condensation product, peroxydicyclohexylamine. Similarly, when the concentrations of cyclohexanone and H,Oz are larger than that of NHa, the formation of the byproducts is favoured. Based on the above results, mechanisms for the formation of cyclohexanone oxime and peroxydicyclohexylamine are presented.