کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5425596 1395861 2006 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication of model Pt-ceria catalysts and an analysis of their performance for CO oxidation
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Fabrication of model Pt-ceria catalysts and an analysis of their performance for CO oxidation
چکیده انگلیسی

Model Pt-ceria catalysts have been prepared by the evaporation of Pt onto ceria (CeO2) films grown on Si(1 1 1) substrates. Photoelectron spectroscopy (XPS, UPS) data are used to characterise the surfaces and their adsorption characteristics, and CO oxidation has been used as a probe reaction to test the activity of the model catalysts.Pure ceria is catalytically-inactive under the test conditions employed, whereas the model Pt/ceria catalysts demonstrate high activity for CO oxidation. The model catalysts also reproduce many of the characteristics of their high-surface area analogues, including the possession of a characteristic light-off temperature, hysteresis in activity as a function of temperature and a negative-order dependence on the CO partial pressure.Many aspects of the behaviour of these catalysts are shown to be a direct result of the strong adsorption of CO. The sensitivity of the dispersed Pt towards oxidation is also experimentally-demonstrated and the importance of this phenomenon is discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 600, Issue 15, 1 August 2006, Pages 3058-3071
نویسندگان
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