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Influence of the Washcoat Structure in the Performance of Automotive Three Way Catalysts

2013-09-08Artigo científico Acesso restrito
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
datacite.subject.sdg03:Saúde de Qualidade
datacite.subject.sdg07:Energias Renováveis e Acessíveis
datacite.subject.sdg11:Cidades e Comunidades Sustentáveis
dc.contributor.authorSantos, Helder
dc.contributor.authorPires, João
dc.contributor.authorCosta, Mário
dc.date.accessioned2026-04-09T14:49:00Z
dc.date.available2026-04-09T14:49:00Z
dc.date.issued2013-09-08
dc.description.abstractTransport limitations inside the porous washcoat layer have an important influence in the light-off and overall conversions even in the case of relatively thin layers used in automotive three way catalysts (TWC). The porous structure of the washcoat layer is controlled at two levels: i) at the level of mesoporous structure, which can be determined by the use of specific synthesis techniques (e.g., sol-gel or pore-templating method), and ii) at the level of macroporous structure, which is influenced by the particle size distribution of mesoporous in a slurry that has undergone a specific thermal treatment. This paper investigates the influence of the washcoat structure in the performance of automotive TWC. Furthermore, the article presents a method that allows to quantify the magnitude of the reaction resistance (chemical kinetics), internal mass transfer resistance (washcoat diffusion), and external mass transfer resistance on the TWC conversions. From experimental data gathered at different operating temperatures (from light-off to 1100 K) and applying the developed methodology for resistances quantification, it was found that the internal mass transfer limitations play a major role in the TWC conversions. The main conclusions from this study are: i) the effective diffusivity strongly depends on the washcoat layer structure, which in turn depends on its preparation process; ii) the resistance quantification analysis reveals that the lower effective diffusivity interval is more adequate for the TWC used in the present investigation, which also indicates that the TWC washcoat has a low percentage of macropores; and iii) to decrease the relevance of the internal mass transfer limitation requires an increase in the effective diffusivity and/or a thinner washcoat layer.eng
dc.description.sponsorshipThis work was developed within the framework of project PTDC/EME-MFE/113683/2009, which is financially supported by Fundação para a Ciência e a Tecnologia. The authors would like to thank technicians Manuel Pratas and Nuno Pires who assisted them in conducting the experimental work presented here.
dc.identifier.citationSantos, H., Pires, J., and Costa, M., "Influence of the Washcoat Structure in the Performance of Automotive Three Way Catalysts," SAE Int. J. Engines 6(3):2013, doi:10.4271/2013-24-0166.
dc.identifier.doi10.4271/2013-24-0166
dc.identifier.issn1946-3936
dc.identifier.issn1946-3944
dc.identifier.urihttp://hdl.handle.net/10400.8/16085
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSAE International
dc.relation.hasversionhttps://saemobilus.sae.org/articles/influence-washcoat-structure-performance-automotive-three-way-catalysts-2013-24-0166
dc.relation.ispartofSAE International Journal of Engines
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectDiffusion
dc.subjectParticle size analysis
dc.subjectSol-gels
dc.subjectSynthesis (chemical)
dc.titleInfluence of the Washcoat Structure in the Performance of Automotive Three Way Catalystseng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1854
oaire.citation.issue3
oaire.citation.startPage1846
oaire.citation.titleSAE International Journal of Engines
oaire.citation.volume06
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameSantos
person.givenNameHelder
person.identifier.ciencia-id5C1B-81F4-0679
person.identifier.orcid0000-0001-6686-7991
person.identifier.ridM-1856-2014
person.identifier.scopus-author-id55778145336
relation.isAuthorOfPublication2b817169-78c2-4922-879a-02f1c40dafd9
relation.isAuthorOfPublication.latestForDiscovery2b817169-78c2-4922-879a-02f1c40dafd9

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