Abstract
The photocatalytic properties of sulphated MoO x/γ-Al 2O 3 catalysts in cyclohexane oxidative dehydrogenation have been determined in a two-dimensional fluidized bed photoreactor and compared to those of sulphated MoO x/TiO 2 catalysts. Photocatalytic tests on MoO x/γ-Al 2O 3 at 8 wt% MoO 3 and various sulphate contents showed the selective (100%) formation of cyclohexene, without production of benzene, as instead found with MoO x /TiO 2. These results show that the selectivity of photocatalytic cyclohexane oxydehydrogenation is dramatically influenced by the catalyst support. Maximum cyclohexane conversion and cyclohexene yield of 11% were obtained for SO 4 content of 2.6 wt% at 120 °C. Physico-chemical characterisation of catalysts indicates the presence of both octahedral polymolybdate and sulphate species on alumina surface, as previously found for titania. Increasing sulphate load, thermogravimetry evidenced the presence of up to three sulphate species at different thermal stability. The lower activity observed at high sulphate content is likely due to polymolybdate decoration by sulphates.
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