Structure characterisation of catalytic particulate filters for automotive exhaust gas aftertreatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914118" target="_blank" >RIV/60461373:22340/17:43914118 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23640/17:43950078

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.matchar.2017.11.011" target="_blank" >http://dx.doi.org/10.1016/j.matchar.2017.11.011</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchar.2017.11.011" target="_blank" >10.1016/j.matchar.2017.11.011</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Structure characterisation of catalytic particulate filters for automotive exhaust gas aftertreatment

Popis výsledku v původním jazyce

Modern automobiles with internal combustion engine are equipped with several different converters of exhaust gas and a particulate filter. The size and cost of exhaust aftertreatment system can be reduced by coating the catalytically active material on or into the porous filter walls. The characterisation of filter morphology including the distribution of catalytic material inside the filter wall is a key prerequisite for the development of porous structures with optimum performance with respect to pressure loss, filtration efficiency and catalytic activity. Three SiC filter samples with different amount of SCR catalyst were characterised by X-ray tomography (XRT), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Combination of the techniques provides detailed and consistent information on filter and coating hierarchical pore structure. The segmented XRT image revealed 3D distribution of catalytic material and larger macropores inside filter wall. The 3D XRT images were further used as the input for mathematical models evaluating porosity, pore size distribution (PSD), effective diffusivity and tortuosity. Maximum sphere inscription method applied to XRT data gave PSD shifted to larger pore sizes in comparison with the MIP results, in line with the bottleneck limitation of MIP. On the other hand, MIP was able to determine also smaller internal pores in the catalyst layer. Pressure loss of the filters measured in lab reactor increased non-linearly with the amount of catalytic coating. The PSD and XRT suggest that a large number of substrate pores is filled up completely by catalytic material.

Název v anglickém jazyce

Structure characterisation of catalytic particulate filters for automotive exhaust gas aftertreatment

Popis výsledku anglicky

Modern automobiles with internal combustion engine are equipped with several different converters of exhaust gas and a particulate filter. The size and cost of exhaust aftertreatment system can be reduced by coating the catalytically active material on or into the porous filter walls. The characterisation of filter morphology including the distribution of catalytic material inside the filter wall is a key prerequisite for the development of porous structures with optimum performance with respect to pressure loss, filtration efficiency and catalytic activity. Three SiC filter samples with different amount of SCR catalyst were characterised by X-ray tomography (XRT), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). Combination of the techniques provides detailed and consistent information on filter and coating hierarchical pore structure. The segmented XRT image revealed 3D distribution of catalytic material and larger macropores inside filter wall. The 3D XRT images were further used as the input for mathematical models evaluating porosity, pore size distribution (PSD), effective diffusivity and tortuosity. Maximum sphere inscription method applied to XRT data gave PSD shifted to larger pore sizes in comparison with the MIP results, in line with the bottleneck limitation of MIP. On the other hand, MIP was able to determine also smaller internal pores in the catalyst layer. Pressure loss of the filters measured in lab reactor increased non-linearly with the amount of catalytic coating. The PSD and XRT suggest that a large number of substrate pores is filled up completely by catalytic material.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/LO1402" target="_blank" >LO1402: CENTEM+</a><br>

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 periodika

Materials Characterization

ISSN

1044-5803

e-ISSN

—

Svazek periodika

134

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

311-318

Kód UT WoS článku

000419416400036

EID výsledku v databázi Scopus

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