Microstructure characterization of washcoated catalytic monolith filters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43919757" target="_blank" >RIV/60461373:22340/19:43919757 - isvavai.cz</a>

Výsledek na webu

<a href="http://sschi.chtf.stuba.sk/ssche_conference2019.html" target="_blank" >http://sschi.chtf.stuba.sk/ssche_conference2019.html</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure characterization of washcoated catalytic monolith filters

Popis výsledku v původním jazyce

The increasingly stringent automotive emission regulations enforce the use of particulate filters to effectively control the particulate emissions from both diesel and gasoline engines. Due to the cost and size limitations of the exhaust gas aftertreatment system, it is favorable to combine the particulate filter with a catalytic reactor for conversion of gaseous pollutants. This research is focused on applying thin films formed by γ-Al2O3 microparticles into the channels of filters. The conversion of pollutants in the automotive catalyst depends on the thickness and the porosity of the applied layer – a higher loading of catalyst can be applied in a thick layer, but it may not be fully utilized due to traffic constraints and pressure loss of the filter increases. This contribution is focused on washcoating of γ-Al2O3 into the channels of SiC and cordierite monolith filter substrates, and characterization of the resulting microstructure by X-ray tomography (XRT), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Samples of catalytic monolith filters were prepared by dip coating. The effect of the following parameters was investigated: pH and viscosity of the suspension, γ-Al2O3 particle size, the immersion rate, pressure used to blow out the excess suspension from the monolith channels and drying conditions. Structure of the coated filters was studied by XRT, SEM and MIP. X-ray tomography provided 3D image of the porous channel wall with the resolution 1 micron and it was possible to segment the two solid phases (substrate and coating) as well as larger pores in the substrate wall. SEM and MIP provided insight also into smaller internal pores in the coated zones. The 3D reconstructed medium can be employed in pore-scale simulations of flow field in the wall and improved estimates of the catalytic conversion and filtration efficiency.

Název v anglickém jazyce

Microstructure characterization of washcoated catalytic monolith filters

Popis výsledku anglicky

The increasingly stringent automotive emission regulations enforce the use of particulate filters to effectively control the particulate emissions from both diesel and gasoline engines. Due to the cost and size limitations of the exhaust gas aftertreatment system, it is favorable to combine the particulate filter with a catalytic reactor for conversion of gaseous pollutants. This research is focused on applying thin films formed by γ-Al2O3 microparticles into the channels of filters. The conversion of pollutants in the automotive catalyst depends on the thickness and the porosity of the applied layer – a higher loading of catalyst can be applied in a thick layer, but it may not be fully utilized due to traffic constraints and pressure loss of the filter increases. This contribution is focused on washcoating of γ-Al2O3 into the channels of SiC and cordierite monolith filter substrates, and characterization of the resulting microstructure by X-ray tomography (XRT), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Samples of catalytic monolith filters were prepared by dip coating. The effect of the following parameters was investigated: pH and viscosity of the suspension, γ-Al2O3 particle size, the immersion rate, pressure used to blow out the excess suspension from the monolith channels and drying conditions. Structure of the coated filters was studied by XRT, SEM and MIP. X-ray tomography provided 3D image of the porous channel wall with the resolution 1 micron and it was possible to segment the two solid phases (substrate and coating) as well as larger pores in the substrate wall. SEM and MIP provided insight also into smaller internal pores in the coated zones. The 3D reconstructed medium can be employed in pore-scale simulations of flow field in the wall and improved estimates of the catalytic conversion and filtration efficiency.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA19-22173S" target="_blank" >GA19-22173S: Mikrostruktura katalytických filtrů pro čištění automobilových výfukových plynů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings 46th International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-8208-011-0

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

1-8

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Tatranské Matliare

Datum konání akce

20. 5. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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