Dual-layer automotive catalysts - effect of transport limitation on NOx reduction
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43903043" target="_blank" >RIV/60461373:22340/16:43903043 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Dual-layer automotive catalysts - effect of transport limitation on NOx reduction
Original language description
Exhaust gas aftertreatment system of a modern Diesel engine consists of a particulate filter and a succession of different catalytic converters. In order to save space and minimize heat losses there is an effort to combine catalysts with different functions in a single monolith reactor coated with multiple layers of different catalysts. However, when the porous layer is too thick, the overall efficiency of the converter is lowered by transport limitations. This work investigates diffusion limitations in dual-layer catalytic converters. LNT coated monoliths were overlaid either with inert (denoted LNT+IN), or an oxidation catalyst (LNT+DOC) to decouple the transport and kinetic effects. The samples were characterised and tested in a laboratory reactor for oxidation reactions and NOx removal. Additional layers brought about changes in the selectivity, longer delay of NH3 breakthrough or shift of N2O formation from primary to secondary peak. While the IN layer lowered overall NOx conversion, the DOC layer addition had both positive (catalytic activity) and negative (transport) effects. At lower temperature NOx storage and regeneration efficiency were improved, whereas at higher temperature, when the LNT itself was active enough, transport limitation in the DOC layer becomes the rate determining step.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
CI - Industrial chemistry and chemical engineering
OECD FORD branch
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Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proceedings 43rd International Conference of the Slovak Society of Chemical Engineering
ISBN
978-80-89597-35-2
ISSN
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e-ISSN
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Number of pages
9
Pages from-to
640-649
Publisher name
Slovak Society of Chemical Engineering
Place of publication
Bratislava
Event location
Tatranské Matliare
Event date
May 23, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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