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Tuning the selectivity of MoO_x supported catalysts for cyclohexane photo oxidehydrogenation

机译:调整MoO_x负载的催化剂对环己烷光氧化物加氢的选择性

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摘要

The photocatalytic properties of sulphated MoO_x/gamma-Al2O3 catalysts in cyclohexane oxidative dehydrogenation have been determined in a two-dimensional fluidized bed photoreactor and compared to those of sulphated MoO_x/TiO2 catalysts.Photocatalytic tests on MoO_x/gamma-Al2O3 at 8 wt% MoO3 and various sulphate contents showed the selective(100%)formation of cyclohexene,without production of benzene,as instead found with MoO_x/TiO2.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 SO4 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.
机译:在二维流化床光反应器中测定了硫酸化的MoO_x /γ-Al2O3催化剂在环己烷氧化脱氢中的光催化性能,并与硫酸化的MoO_x / TiO2催化剂进行了光催化性能的比较。各种硫酸盐含量表明,环己烯的选择性(100%)形成而不生成苯,而MoO_x / TiO2却发现了这些结果。这些结果表明,光催化环己烷氧化脱氢的选择性受到催化剂载体的极大影响。最大环己烷转化率和在120°C下,SO4含量为2.6 wt%时,环己烯产率为11%。催化剂的物理化学表征表明,氧化铝表面上同时存在八面体多钼酸盐和硫酸盐物种,如先前对二氧化钛所发现的。增加硫酸盐负荷,热重分析法证明在不同的热稳定性下最多存在三种硫酸盐物种。在高硫酸盐含量下观察到的活性可能是由于硫酸盐修饰了聚钼酸盐。

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