کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1483455 | 1510494 | 2010 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxidative dehydrogenation of butane over substoichiometric magnesium vanadate catalysts prepared by citrate route
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Substoichiometric magnesium vanadate catalysts, (Mg-Vi with i = 1, 2, and 3) with different V/Mg atomic ratios and stoichiometric (Mg3V2O8, Mg2V2O7 and MgV2O6), were prepared by citric acid technique. Characterization showed that substoichiometric samples correspond to well-dispersed VO4 units in the MgO matrix. Moreover, taking into account the Raman data, the coexistence of ortho, pyro and meta vanadate phases cannot be discarded. The Mg3V2O8 sample was more active for the oxidative dehydrogenation of n-butane, but less selective to C4 alkenes than the Mg2V2O7 sample. Stoichiometric samples produce mainly 1-butene, whereas for substoichiometric samples butadiene was the major reaction product for reaction temperatures higher than 748 K. The easily reducible VO4 species, and eventually the coexistence of different vanadates phases, appear to be responsible for the catalytic behaviour displayed by the substoichiometric catalysts prepared by citrate technique.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 356, Issues 28â30, 15 June 2010, Pages 1488-1497
Journal: Journal of Non-Crystalline Solids - Volume 356, Issues 28â30, 15 June 2010, Pages 1488-1497
نویسندگان
Ana Paula Soares Dias, Ljubomir Dimitrov Dimitrov, Margarida Corte-Real Oliveira, Rodica ZÇvoianu, Auguste Fernandes, Manuel Farinha Portela,