کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
61987 47616 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of support in the oxidation of acetylene over gold catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Role of support in the oxidation of acetylene over gold catalysts
چکیده انگلیسی

The influence of the carrier (CeO2, TiO2 or ZrO2) on the reaction of acetylene oxidation over a 2% gold catalyst has been investigated in the presence or in the absence of CO. XPS reveals that gold is metallic in every case and the percentage of gold on the surface is always higher than that in the bulk confirming the wide dispersion as evaluated by TEM. There is a significant effect of the support on the activity in the absence of CO, but the presence of CO affects the reactivity differently according to the support. In a mixture of CO and C2H2, the oxidation of CO is systematically inhibited by C2H2 whereas the behaviour is completely different for the oxidation of C2H2. CO has no effect upon Au/CeO2, acts as an inhibitor with Au/TiO2 and as a promoter with Au/ZrO2. Kinetic study reveals that the order towards C2H2 remains unchanged whereas the order towards O2 clearly depends upon the support. These effects on activity and kinetics may result from various factors discussed in this paper.

The influence of the carrier (CeO2, TiO2 or ZrO2) on the reaction of acetylene oxidation over a 2% gold catalyst has been investigated in the presence or in the absence of CO. The differences in activities are explained. The reason lies in a different kinetic behaviour, mainly for the mode of adsorption and/or reaction of oxygen.Figure optionsDownload high-quality image (74 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 269, Issue 1, 1 January 2010, Pages 26–32
نویسندگان
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