کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1689441 1011229 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
CO oxidation on planar Au/TiO2 model catalysts: Deactivation and the influence of water
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
CO oxidation on planar Au/TiO2 model catalysts: Deactivation and the influence of water
چکیده انگلیسی

The CO oxidation behaviour of planar Au/TiO2 model catalysts was studied by a combination of kinetic measurements and in-situ IR measurements under realistic pressure and temperature conditions (p = 20 mbar, T = 80 °C). During reaction in a CO/O2 mixture, the model catalysts deactivated significantly. Adding small amounts of H2O (1000 ppm) to the reactive CO/O2 gas mixture, the catalyst activity increased markedly, by at least one order of magnitude. Furthermore, in-situ IR measurements show a decrease of the amount of adsorbed by-products of the CO oxidation, and a change of the predominant by-product from surface carbonate to surface formate. Possible reasons for the deactivation are discussed and the effect of H2O addition is compared to results of similar studies on more realistic dispersed catalysts.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 84, Issue 1, 25 August 2009, Pages 193–196
نویسندگان
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