Immobilized catalysts were prepared from silica gel and montmorillonite functionalized by silane coupling reagents. Complexes with metal ions were easily formed. The dioxygen oxidation of hydrocarbon using the immobilized catalyst was investigated. Cyclohexanol (mainly) and some cyclohexanone were produced by the oxidation of cyclohexane at ordinary temperature, under atmospheric pressure. Dioxygen oxidation of the nonactivated beta-position of the ethyl group in ethylbenzene was observed in the presence of cobalt ion-immobilized montmorillonite catalyst in the presence of lithium ion.