کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
55326 47047 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reaction between soot and stored NOX over K-based LNT catalysts investigated by temperature programmed methods and labeling isotopic experiments
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Reaction between soot and stored NOX over K-based LNT catalysts investigated by temperature programmed methods and labeling isotopic experiments
چکیده انگلیسی

The interaction between NOX stored over K/Al2O3 and Pt-K/Al2O3 catalysts and soot is investigated in this work. TPD and TPO experiments are carried out where the reactivity/thermal decomposition of nitrates is investigated in the presence and in the absence of soot. It is found that the presence of soot favors the decomposition/reduction of the stored nitrates, while soot is being oxidized. Clear indication of the direct participation of the surface nitrates in soot oxidation is obtained, without the requirement of the preliminary thermal decomposition of nitrates. Such a mechanism occurs thanks to the mobility of the adsorbed NOX species and is not promoted by platinum. This surface reaction mechanism parallels the gas-phase soot oxidation by NO2 and O2 evolved upon decomposition of the stored NOX. K-based samples are more active than Ba-containing catalysts due to the higher mobility of the NOX species adsorbed on K with respect to Ba.

Stored NOX are mobile and oxidize soot.Figure optionsDownload high-quality image (257 K)Download as PowerPoint slideHighlights
► Stored NOX are mobile and oxidize soot.
► Pt does not affect the soot oxidation process by the stored nitrates.
► K-based samples are more active than Ba-containing catalysts due to the higher mobility of the stored NOX species.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 197, Issue 1, 15 December 2012, Pages 228–235
نویسندگان
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