关键词:

纳米催化剂, 合成, 环己烷, 环己烯, 活性物种

Abstract:

A series of MoO3/TiO2，K2O-MoO3/TiO2，V2O5-MoO3/TiO2，Al2O3-MoO3/TiO2 and K2O-V2O5-MoO3/TiO2 were prepared by the sol-gel method，and characterized with TEM，XRD and IR.The catalytic activity of oxydehydrogenation of cyclohexane to cyclohexene was tested.The results showed that MoO3 was distributed on the carrier of TiO2 with monolayer or/and multilayer.The Mo in the monolayer was bonded with O—Ti structure，and caused dissociation of the water molecules on the surface of TiO2，and the activity centre of Mo6+ and Mo—O- species were formed by means of activation to eliminate the hydroxyl group.For the multilayer structure the main active species were Mo[FY=，1]O and Mo—O-.A synergetic effect existed between the dehydrogenation centre and the oxygen-supply centre，and was affected by the addition of K，Al or V.

Key words:

纳米催化剂, 合成, 环己烷, 环己烯, 活性物种