کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10244845 | 47706 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dehydrogenation of propane to propene over different polymorphs of gallium oxide
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
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چکیده انگلیسی
Dehydrogenation of propane to propene in the presence or absence of CO2 over four polymorphs of gallium oxide was investigated. β-Ga2O3 exhibits the highest activity among the polymorphs, and it is even more active than chromium oxide catalyst in the presence of CO2. H2-TPR and XPS studies show that gallium oxide is hardly reduced below 600â°C. The dehydrogenation reaction is suggested to proceed through a heterolytic dissociation reaction pathway, and it is enhanced by CO2 because of the existence of the reverse water gas shift reaction and the Boudouard reaction. The high catalytic activity of β-Ga2O3 is probably associated with an abundance of surface medium-strong acid sites related to the coordinatively unsaturated Ga3+ cations and the conjugated effect of proton and oxide. Furthermore, increasing the reaction temperature facilitates the activation of CO2 over β-Ga2O3. The promoting effect of CO2 on β-Ga2O3 catalyst is more evident above 550â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 232, Issue 1, 15 May 2005, Pages 143-151
Journal: Journal of Catalysis - Volume 232, Issue 1, 15 May 2005, Pages 143-151
نویسندگان
Bo Zheng, Weiming Hua, Yinghong Yue, Zi Gao,