کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
56837 47097 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidative dehydrogenation of ethane over vanadium-based hexagonal mesoporous silica catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Oxidative dehydrogenation of ethane over vanadium-based hexagonal mesoporous silica catalysts
چکیده انگلیسی

Vanadium-containing hexagonal mesoporous silica catalysts were tested in oxidative dehydrogenation of ethane. V-HMS catalysts (0.3–9.0 wt.% V) were prepared by impregnation with solution of vanadyl acetylacetonate, and by incorporation of vanadium in the synthesis process. The prepared catalysts achieved a different distribution of vanadium species (isolated monomeric units with tetrahedral coordination, oligomeric units connected by VOV bonds up to distorted tetrahedral coordination, two-dimensional polymeric units in octahedral coordination, and bulk vanadium oxides). The contribution deals with the understanding of the relationship between the distribution of vanadium species and their activity in ODH of ethane. It has been found that both monomeric and oligomeric vanadium species play important role in ODH of ethane. The activity correlated with the population of oligomeric tetrahedrally coordinated vanadium species, which were evidenced by the UV–vis band at 315 nm. To analyze this effect, V-HMS catalysts were characterized by means of UV–vis spectroscopy, H2-TPR and N2-adsorption.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 141, Issues 3–4, 30 March 2009, Pages 282–287
نویسندگان
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