کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
57433 47119 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of V in rutile-type Sn/V/Nb/Sb mixed oxides, catalysts for propane ammoxidation to acrylonitrile
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
The role of V in rutile-type Sn/V/Nb/Sb mixed oxides, catalysts for propane ammoxidation to acrylonitrile
چکیده انگلیسی

Rutile-type Sn/V/Nb/Sb mixed oxides of composition Sn/V/Nb/Sb 1/x/1/3 (atomic ratios) were prepared by co-precipitation from an alcoholic medium, characterized and tested as catalysts for the ammoxidation of propane to acrylonitrile. Vanadium had a relevant effect on chemical–physical and reactivity properties of catalysts. The latter consisted of Sn oxide incorporating Sb and Nb cations, of defective rutile-type V/Nb/Sb mixed oxide and of Sb oxide. Increasing amounts of V in samples caused an increase of the crystallinity and a corresponding decrease of the specific surface area. However, a relevant enhancement of the catalyst activity (rate of propane conversion per unit surface area) was observed. This was attributed to the generation of cationic vacancies, formed in the rutile-type V/Nb/Sb mixed oxide, that enhanced the intrinsic activity of V ions in the activation of the alkane. On the other hand, the selectivity to acrylonitrile declined considerably when the content of V in samples was increased, whereas the selectivity to carbon monoxide and that to cyanhydric acid increased.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 142, Issues 3–4, 30 April 2009, Pages 170–174
نویسندگان
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