| Attributes | Values |
|---|
| rdf:type
| |
| Description
| - In the case of automotive catalytic converters, the effect of the porous waschcoat structure on effective diffusivity has been already studied with detailed porescale simulation of CO diffusion and oxidation [1]. However, larger molecules are commonly present in the exhaust gas. To properly assess their possible diffusion limitation, n-decane was chosen and tested on catalysts of the Pt/?-Al2O3 type. The major and favourable transport mechanism is volume diffusion (in macropores), therefore only macroporous structure was varied. Transport properties were experimentally studied by performing light-off experiments in a lab-scale reactor. A multi-scale methodology and models for CO diffusion and oxidation were modified and applied on the n-decane oxidation. In a pore-scale, small section of the porous catalyst was reconstructed using discrete element method. Then detailed transport and reaction was modelled in the reconstructed structure treating the diffusion in macropores as volume diffusion, in mesopores as Knudsen diffusion and the oxidation as a global reaction. Average reaction rate through the whole structure was calculated for varied boundary concentration and temperature. Resulting light-off curves were compared with experimental data and another model, which is commonly used in industry. As the studied reactant changed from CO to n-decane, the diffusion limitation in the catalysts increased. The multi-scale model with the detailed pore-scale simulation predicted more accurately experimental light-off curves compared to the industrial standard model. The methodology can be applied also to other species present in the exhaust gas to design optimised automotive catalytic converters with low transport limitation or to evaluate effective diffusion coefficient for other models.
- In the case of automotive catalytic converters, the effect of the porous waschcoat structure on effective diffusivity has been already studied with detailed porescale simulation of CO diffusion and oxidation [1]. However, larger molecules are commonly present in the exhaust gas. To properly assess their possible diffusion limitation, n-decane was chosen and tested on catalysts of the Pt/?-Al2O3 type. The major and favourable transport mechanism is volume diffusion (in macropores), therefore only macroporous structure was varied. Transport properties were experimentally studied by performing light-off experiments in a lab-scale reactor. A multi-scale methodology and models for CO diffusion and oxidation were modified and applied on the n-decane oxidation. In a pore-scale, small section of the porous catalyst was reconstructed using discrete element method. Then detailed transport and reaction was modelled in the reconstructed structure treating the diffusion in macropores as volume diffusion, in mesopores as Knudsen diffusion and the oxidation as a global reaction. Average reaction rate through the whole structure was calculated for varied boundary concentration and temperature. Resulting light-off curves were compared with experimental data and another model, which is commonly used in industry. As the studied reactant changed from CO to n-decane, the diffusion limitation in the catalysts increased. The multi-scale model with the detailed pore-scale simulation predicted more accurately experimental light-off curves compared to the industrial standard model. The methodology can be applied also to other species present in the exhaust gas to design optimised automotive catalytic converters with low transport limitation or to evaluate effective diffusion coefficient for other models. (en)
|
| Title
| - Measurements and multi-scale modelling of n-decane diffusion in coated catalytic layers
- Measurements and multi-scale modelling of n-decane diffusion in coated catalytic layers (en)
|
| skos:prefLabel
| - Measurements and multi-scale modelling of n-decane diffusion in coated catalytic layers
- Measurements and multi-scale modelling of n-decane diffusion in coated catalytic layers (en)
|
| skos:notation
| - RIV/60461373:22340/13:43895627!RIV14-GA0-22340___
|
| http://linked.open...avai/riv/aktivita
| |
| http://linked.open...avai/riv/aktivity
| |
| http://linked.open...vai/riv/dodaniDat
| |
| http://linked.open...aciTvurceVysledku
| |
| http://linked.open.../riv/druhVysledku
| |
| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
| |
| http://linked.open...dnocenehoVysledku
| |
| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22340/13:43895627
|
| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - light-off curve; n-decane oxidation; automotive catalyst; 3D reconstruction; pore-scale model; multi-scale modelling; effective diffusion coefficient (en)
|
| http://linked.open.../riv/klicoveSlovo
| |
| http://linked.open...ontrolniKodProRIV
| |
| http://linked.open...v/mistoKonaniAkce
| |
| http://linked.open...i/riv/mistoVydani
| |
| http://linked.open...i/riv/nazevZdroje
| - Proceedings of the 40th International Conference of Slovak Society of Chemical Engineering
|
| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
| |
| http://linked.open...cetTvurcuVysledku
| |
| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...iv/tvurceVysledku
| - Kočí, Petr
- Marek, Miloš
- Dudák, Michal
|
| http://linked.open...vavai/riv/typAkce
| |
| http://linked.open.../riv/zahajeniAkce
| |
| number of pages
| |
| http://purl.org/ne...btex#hasPublisher
| - Slovak Society of Chemical Engineering
|
| https://schema.org/isbn
| |
| http://localhost/t...ganizacniJednotka
| |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)