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Mathematical modelling of cold start effects over zeolite SCR catalysts for exhaust gas aftertreatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
54712 47023 2014 6 PDF Available
Title
Mathematical modelling of cold start effects over zeolite SCR catalysts for exhaust gas aftertreatment
Abstract

•Development of a model suitable to simulate cold start effects observed over metal-promoted zeolite SCR catalysts.•Addition of low-T NO oxidation to NO2, NO2 physisorption and H2O adsorption to an SCR mechanistic model.•Capability of the new model in reproducing transient effects related to cold start both at the lab scale and in engine test bench experiments.

In this contribution a mathematical model suitable to simulate cold start effects over metal-promoted zeolite SCR catalysts is developed and included into an existing SCR converter model. We start from a recently published microkinetic scheme, which describes the NO2 related SCR reactions at temperatures above about 100 °C on the basis of a complex reaction network, taking into account NO2 storage with formation of nitrates and their subsequent decomposition/reactivity. In order to describe material and thermal cold start effects observed from room temperature we extend such a kinetic scheme to include the low-T NO oxidation to NO2, NO2 physisorption and H2O adsorption. The rate parameters are fitted to our data from lab-scale runs analyzing each individual step. We show that the resulting model can reproduce the transient effects related to cold start both at the lab scale and in engine test bench experiments.

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Keywords
Cold start; Urea-SCR; Kinetic modeling; Zeolite catalyst; NO oxidation
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Mathematical modelling of cold start effects over zeolite SCR catalysts for exhaust gas aftertreatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 231, 1 August 2014, Pages 99–104
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