About: Effect of cavities and cracks on diffusivity in coated catalyst layer

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About: Effect of cavities and cracks on diffusivity in coated catalyst layer Goto Sponge NotDistinct Permalink

An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.sciencedirect.com/science/article/pii/S092058611300326X#
Description	In this paper we apply novel experimental and computational methods that investigate the contribution of cracks and cavities to diffusion in catalytic coating (washcoat). A sample of commercial catalytic monolith for automotive exhaust gas aftertreatment is scanned by X-ray microtomography (?CT) to obtain realistic 3D images of the coated layer. In the tested sample the cracks and cavities represent about 20% of the coated layer volume. A 3D diffusion is then simulated within sections of the virtually reconstructed porous structure. Benchmark simulations performed for the coating without any cracks or cavities (i.e. containing only standard meso- and macro-pores) indicate that the overall effective diffusivity is approx. 1.7 times lower in absence of these structural defects and the difference increases with temperature. The effect of cracks and cavities is further tested in combined reaction and transport simulation and corresponding effectiveness factors are evaluated. Finally, spatially averaged reaction rates are employed in multi-scale simulations of light-off curves that reveal the impact of the structural defects in the catalytic coating on overall performance of the monolith reactor. In this paper we apply novel experimental and computational methods that investigate the contribution of cracks and cavities to diffusion in catalytic coating (washcoat). A sample of commercial catalytic monolith for automotive exhaust gas aftertreatment is scanned by X-ray microtomography (?CT) to obtain realistic 3D images of the coated layer. In the tested sample the cracks and cavities represent about 20% of the coated layer volume. A 3D diffusion is then simulated within sections of the virtually reconstructed porous structure. Benchmark simulations performed for the coating without any cracks or cavities (i.e. containing only standard meso- and macro-pores) indicate that the overall effective diffusivity is approx. 1.7 times lower in absence of these structural defects and the difference increases with temperature. The effect of cracks and cavities is further tested in combined reaction and transport simulation and corresponding effectiveness factors are evaluated. Finally, spatially averaged reaction rates are employed in multi-scale simulations of light-off curves that reveal the impact of the structural defects in the catalytic coating on overall performance of the monolith reactor. (en)
Title	Effect of cavities and cracks on diffusivity in coated catalyst layer Effect of cavities and cracks on diffusivity in coated catalyst layer (en)
skos:prefLabel	Effect of cavities and cracks on diffusivity in coated catalyst layer Effect of cavities and cracks on diffusivity in coated catalyst layer (en)
skos:notation	RIV/49777513:23640/13:43919893!RIV14-MSM-23640___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(ED2.1.00/03.0088), P(GAP106/10/1568), P(LH12086)
http://linked.open...iv/cisloPeriodika	SI
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Marek, Miloš Kočí, Petr Gregor, Tomáš Štěpánek, František
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Západočeská univerzita v Plzni / Nové technologie - výzkumné centrum
http://linked.open...dnocenehoVysledku	71400
http://linked.open...ai/riv/idVysledku	RIV/49777513:23640/13:43919893
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	X-ray microtomography; Porous catalyst; Exhaust gas aftertreatment; Diffusion; Coating; 3D digital reconstruction (en)
http://linked.open.../riv/klicoveSlovo	3D digital reconstruction Coating Porous catalyst X-ray microtomography Exhaust gas aftertreatment Diffusion
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[4068C0AF10B9]
http://linked.open...i/riv/nazevZdroje	Catalysis Today
http://linked.open...in/vavai/riv/obor	CI
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Analysis, Modeling and Control of Spatiotemporal Concentration Patterns in Nitrogen Oxide Reduction (deNOx) Catalysts for Automotive Exhaust Gas Aftertreatment Optimization of transport and catalytic properties of porous materials on micro- and nano-scale using 3D digital reconstruction methods Centre of the New Technologies and Materials
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	216
http://linked.open...iv/tvurceVysledku	Gregor, Tomáš Kočí, Petr Štěpánek, František Marek, Miloš Novák, Vladimír Choi, Jae-Soon
http://linked.open...ain/vavai/riv/wos	000324296400022
issn	0920-5861
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.cattod.2013.07.002
http://localhost/t...ganizacniJednotka	23640

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