کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6656589 | 461654 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
VOx-K2O/γ-Al2O3 catalyst for nonoxidative dehydrogenation of isobutane
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: VOx-K2O/γ-Al2O3 catalyst for nonoxidative dehydrogenation of isobutane VOx-K2O/γ-Al2O3 catalyst for nonoxidative dehydrogenation of isobutane](/preview/png/6656589.png)
چکیده انگلیسی
V-K/γ-Al2O3 catalysts were prepared using an incipient impregnation method and characterized by N2 adsorption, MAS-NMR, TPR, FT-IR, XPS and Py-FT-IR techniques. The catalytic activity of V-K/γ-Al2O3 in non-oxidative dehydrogenation of isobutane was investigated in a continuous flow packed bed micro reactor. The results indicate that V-K/γ-Al2O3 catalysts display a bifunctional effect. Characterization study suggests that the distribution of various VOx species were influenced by vanadium loadings to a great extent. The catalytic activity of vanadium-based catalysts was consequently promoted to different degrees by diverse VOx species and the highest dehydrogenation activity was obtained for the sample with the highest dispersion of the oligomeric VOx species. The reduced state of vanadium oxide i.e. V3 + and V4 + sites were proved to be the catalytic active sites for dehydrogenation reaction. Moreover, the activity and selectivity of catalysts were strongly related with the acidity of the catalysts. The ratio of Lewis acid sites to Brønsted acid sites (NLS/NBS) was negatively correlated to the isobutene selectivity. Among the tested catalysts, V-K/γ-Al2O3 with an optimum vanadium loading of 10% showed the highest isobutene yield of 42.5%, with ideal stability of presenting yield up to 37.8% after 10 h continuous dehydrogenation reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 151, October 2016, Pages 31-39
Journal: Fuel Processing Technology - Volume 151, October 2016, Pages 31-39
نویسندگان
Yu-Peng Tian, Peng Bai, Shao-Min Liu, Xin-Mei Liu, Zi-Feng Yan,