کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
58019 47139 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tuning the selectivity of MoOx supported catalysts for cyclohexane photo oxidehydrogenation
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Tuning the selectivity of MoOx supported catalysts for cyclohexane photo oxidehydrogenation
چکیده انگلیسی

The photocatalytic properties of sulphated MoOx/γ-Al2O3 catalysts in cyclohexane oxidative dehydrogenation have been determined in a two-dimensional fluidized bed photoreactor and compared to those of sulphated MoOx/TiO2 catalysts. Photocatalytic tests on MoOx/γ-Al2O3 at 8 wt% MoO3 and various sulphate contents showed the selective (100%) formation of cyclohexene, without production of benzene, as instead found with MoOx/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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 128, Issues 3–4, 30 October 2007, Pages 251–257
نویسندگان
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