Chemical deactivation by phosphorous under lean hydrothermal conditions over Cu/BEA NH3-SCR catalysts

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dc.citation.epage263en_US
dc.citation.spage251en_US
dc.citation.volumeNumber147en_US
dc.contributor.authorAndonova, S.en_US
dc.contributor.authorVovk, E.en_US
dc.contributor.authorSjöblom, J.en_US
dc.contributor.authorOzensoy, E.en_US
dc.contributor.authorOlsson, L.en_US
dc.date.accessioned2015-07-28T12:06:37Z
dc.date.available2015-07-28T12:06:37Z
dc.date.issued2014-04-05en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractTo obtain a better understanding of the deactivation of SCR catalysts that may be encountered due to the presence of P-containing impurities in diesel exhausts, the effects induced by P over Cu/BEA NH3- SCR catalysts were studied as functions of the temperature of poisoning and P concentration in the feed. Cu/BEA catalysts with different Cu loadings (4 and 1.3 wt% Cu) were exposed to P by controlled evaporation of H3PO4 in the presence of 8% O2 and 5% H2O at 573 and 773K. The reaction studies were performed by NH3-storage/TPD, NH3/NO oxidation and standard NH3-SCR. In addition, a combination of several characterisation techniques (ICP–AES, BET surface area, pore size distribution, H2-TPR and XPS) was applied to provide useful information regarding the mechanism of P deactivation. Pore condensation of H3PO4 in combination with pore blocking was observed. However, the measured overall deactivation was found to occur mostly by chemical deactivation reducing the number of the active Cu species and hence deteriorating the redox properties of the Cu/BEA catalysts. The process of P accumulation on the surface preferentially occurs on the “over exchanged” Cu active sites with the formation of phosphate species. This is likely the reason for the more severe deactivation of the 4% Cu/BEA compared to 1.3% Cu/BEA. Further, the higher NOx reduction performance at 773K of the P-poisoned Cu/BEA catalysts was found to originate from the lower selectivity towards NH3 oxidation, which occurs predominately on the “over-exchanged” sites.en_US
dc.identifier.doi10.1016/j.apcatb.2013.08.041en_US
dc.identifier.issn0926-3373
dc.identifier.urihttp://hdl.handle.net/11693/13492
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.apcatb.2013.08.041en_US
dc.source.titleApplied Catalysis B: Environmentalen_US
dc.subjectNh3 Scren_US
dc.subjectNox Reductionen_US
dc.subjectCu/BEA catalystsen_US
dc.subjectP Poisoningen_US
dc.subjectDeactivationen_US
dc.titleChemical deactivation by phosphorous under lean hydrothermal conditions over Cu/BEA NH3-SCR catalystsen_US
dc.typeArticleen_US
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