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Insight into the praseodymium effect on the NH3-SCR reaction pathways over W or Nb supported ceria-zirconia based catalysts

hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorCROISÉ, Charlotte
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPOINTECOUTEAU, Rémy
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorAKIL, Joudia
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDEMOURGUES, Alain
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorBION, Nicolas
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorCOURTOIS, Xavier
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorCAN, Fabien
dc.date.issued2021
dc.identifier.issn0926-3373
dc.description.abstractEnThe partial substitution of zirconium for praseodymium in a ceria-zirconia support was studied for WO3 or Nb2O5 supported catalysts dedicated to the NOx SCR by NH3. This partial substitution favored the support reducibility, but both niobium and tungsten impregnation strongly inhibited the redox behaviors of the support. Concomitantly, Nb2O5 and WO3 also provided acidic sites but praseodymium noticeably inhibited the ammonia storage, especially for WO3-containing sample. Finally, praseodymium drastically decreased the deNOx performances. Additional NO and NH3 oxidation experiments were performed and the various redox and acidic behaviors of all the studied materials were suitable to provide an overview of the reactional pathways which begins by the oxidative dehydrogenation of NH3 on acid sites. The generated species react either with oxygen species or with gaseous NO, reflecting a strong competition between the NOx SCR and NH3 oxidation together with the formation of a key intermediate in the nitrogen oxides reduction.
dc.description.sponsorshipNouveaux composés pour le stockage de l'oxygène, l'oxydation et la réduction en dépollution automobile - ANR-17-CE08-0022
dc.language.isoen
dc.publisherElsevier
dc.title.enInsight into the praseodymium effect on the NH3-SCR reaction pathways over W or Nb supported ceria-zirconia based catalysts
dc.typeArticle de revue
dc.identifier.doi10.1016/j.apcatb.2021.120563
dc.subject.halChimie/Catalyse
bordeaux.journalApplied Catalysis B: Environmental
bordeaux.page120563
bordeaux.volume298
bordeaux.peerReviewedoui
hal.identifierhal-03330201
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03330201v1
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