Structural characterisation of catalysed particulate filters for automotive exhaust gas treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914112" target="_blank" >RIV/60461373:22340/17:43914112 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Structural characterisation of catalysed particulate filters for automotive exhaust gas treatment

Popis výsledku v původním jazyce

Combustion engines produce both gaseous and solid pollutants which are limited by emission standards. In order to pass the latest standards, size- and cost-requirements of modern exhaust gas aftertreatment systems are growing and more compact multi-functional units need to be developed. A promising solution is the application of catalytically active washcoat directly into the porous structure of a particulate filter. Several requirements need to be met in catalysed particulate filters simultaneously: high filtration efficiency and catalytic activity and low pressure loss ? thorough structural characterisation has to be carried out to optimise the filter performance. In the scope of this work, three samples of catalysed Diesel particulate filters (bare SiC substrate and SiC loaded with two different loadings of SCR catalyst for NOx reduction) were characterised by a combination of techniques: SEM, X-ray tomography (XRT) and mercury porosimetry. Strengths and weaknesses of all techniques were identified and a methodology for effective structural characterisation of catalysed filters was proposed ? the studied parameters included washcoat distribution and volume fractions of individual phases (substrate, washcoat and pores = porosity) obtained from image segmentation. The 3D images reconstructed from XRT can further be used as the input for mathematical models evaluating porosity, pore size distribution (PSD), effective diffusivity and tortuosity and gas flow simulations by CFD in order to predict pressure loss of the filter.

Název v anglickém jazyce

Structural characterisation of catalysed particulate filters for automotive exhaust gas treatment

Popis výsledku anglicky

Combustion engines produce both gaseous and solid pollutants which are limited by emission standards. In order to pass the latest standards, size- and cost-requirements of modern exhaust gas aftertreatment systems are growing and more compact multi-functional units need to be developed. A promising solution is the application of catalytically active washcoat directly into the porous structure of a particulate filter. Several requirements need to be met in catalysed particulate filters simultaneously: high filtration efficiency and catalytic activity and low pressure loss ? thorough structural characterisation has to be carried out to optimise the filter performance. In the scope of this work, three samples of catalysed Diesel particulate filters (bare SiC substrate and SiC loaded with two different loadings of SCR catalyst for NOx reduction) were characterised by a combination of techniques: SEM, X-ray tomography (XRT) and mercury porosimetry. Strengths and weaknesses of all techniques were identified and a methodology for effective structural characterisation of catalysed filters was proposed ? the studied parameters included washcoat distribution and volume fractions of individual phases (substrate, washcoat and pores = porosity) obtained from image segmentation. The 3D images reconstructed from XRT can further be used as the input for mathematical models evaluating porosity, pore size distribution (PSD), effective diffusivity and tortuosity and gas flow simulations by CFD in order to predict pressure loss of the filter.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

PROCEEDINGS 44th International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-89597-58-1

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

7

Strana od-do

724-730

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Demänovská dolina

Datum konání akce

22. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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