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Detailed kinetic modeling of the NH3–NO/NO2 SCR reactions over a commercial Cu-zeolite catalyst for Diesel exhausts after treatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
55328 47047 2012 13 PDF Available
Title
Detailed kinetic modeling of the NH3–NO/NO2 SCR reactions over a commercial Cu-zeolite catalyst for Diesel exhausts after treatment
Abstract

A dynamic micro-kinetic model is developed in close agreement with all the details of the NO2-related SCR catalytic chemistry over a Cu-zeolite catalyst. The rate parameters are estimated from transient kinetic runs, namely isothermal concentration step changes, temperature programmed desorption (TPD) and temperature programmed surface reaction (TPSR) experiments, designed to address the individual steps in the surface mechanism, including adsorption of ammonia, adsorption of NO2 in the form of surface nitrites and nitrates, decomposition of nitrites to nitrogen via reaction with ammonia, reversible reduction of nitrates to nitrites by NO (Fast SCR route), and direct reduction of nitrates by ammonia (NO2-SCR route). The fitted set of rate equations is able to predict the complex transient behaviors associated with the global Fast-SCR and NO2-SCR reactions observed in T-ramp validation experiments.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (176 K)Download as PowerPoint slideHighlights► Mechanistic transient kinetic model of NO2-related SCR reactions over Cu-zeolite. ► Nitrite/nitrates storage/reactivity are key to transient kinetic modeling of NO/NO2–NH3-SCR at low-T. ► Nitrates storage/reactivity with NO and NH3 found in close agreement with surface chemistry over Fe-zeolites. ► Results are relevant for modeling of cold-start transients.

Keywords
Diesel-urea SCR; Fast SCR; NO2 SCR; Catalytic mechanism; Kinetics; Modeling; Dynamic methods
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Detailed kinetic modeling of the NH3–NO/NO2 SCR reactions over a commercial Cu-zeolite catalyst for Diesel exhausts after treatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 197, Issue 1, 15 December 2012, Pages 243–255
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us