کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
58895 47180 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
VOx supported SBA-15 catalysts for the oxidative dehydrogenation of ethylbenzene to styrene in the presence of N2O
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
VOx supported SBA-15 catalysts for the oxidative dehydrogenation of ethylbenzene to styrene in the presence of N2O
چکیده انگلیسی

The molecular designed dispersion (MDD) method was used for the modification of SBA-15 with vanadium oxide. Vanadyl acetylacetonate was grafted on the support surface at different VO(acac)2 concentrations in a toluene solution, and then converted into the VOx/SBA-15 catalysts at elevated temperatures. The thermal transformation of surface species was studied by FTIR-PAS spectroscopy. The obtained materials were characterized with respect to their texture (BET), metal dispersion (FT-Raman and UV–vis-DR) and reducibility (H2-TPR). It was found that only isolated V5+ species were present in the samples with a low V loading. The catalyst with the highest V content showed the presence of polymeric V5+ species, which appeared to be easier reducible compared to the isolated form of V. The VOx/SBA-15 samples were tested as catalysts in the oxidative dehydrogenation of ethylbenzene to styrene in the presence of N2O. An increase in the catalytic activity with raising the V content was observed. It was however prove that monomeric V5+ species were considerably more active and selective in the styrene formation than oligomeric ones.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 114, Issues 2–3, 15 May 2006, Pages 307–313
نویسندگان
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