Effects induced by interaction of the Pt/CeO x /ZrO x /γ-Al 2 O 3 ternary mixed oxide DeNO x catalyst with hydrogen

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buir.contributor.authorOk, Zehra Aybegüm
buir.contributor.authorÖzensoy, Emrah
dc.citation.epage674en_US
dc.citation.spage664en_US
dc.citation.volumeNumber357en_US
dc.contributor.authorAndonova, S.en_US
dc.contributor.authorOk, Zehra Aybegümen_US
dc.contributor.authorÖzensoy, Emrahen_US
dc.contributor.authorHadjiivanov, K.en_US
dc.date.accessioned2020-01-28T06:29:08Z
dc.date.available2020-01-28T06:29:08Z
dc.date.issued2020
dc.departmentDepartment of Chemistryen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractEffects of H2/D2 adsorption on the surface chemistry of Pt/CeOx-ZrOx/γ-Al2O3 DeNOx catalyst were investigated. In-situ FTIR spectroscopy and NOx-TPD techniques were utilized to monitor changes in the surface chemistry of studied materials. Adsorption studies of CO and O2 revealed that the Pt/Ce-Zr/Al sample, initially reduced with H2 at 723 K, is characterized by the presence of oxygen vacancies in close vicinity of Ce3+ centres and metallic Pt sites. Adsorption of O2 occurred through the formation of superoxide (O2 −)ads species and oxidation of Ce3+ to Ce4+ ions. The ability of the catalyst to activate molecular O2 originates from its relatively high population of oxygen vacancies located on/near the surface. Interaction of Pt/Ce-Zr/Al system with H2 or D2 takes place through heterolytic dissociation at ambient temperature. D2 adsorption leads to the reduction of Ce4+ to Ce3+ ions and formation of adsorbed molecular heavy water and gradual D/H exchange with the existing surface hydroxyl groups. Generated D2O interacts with isolated hydroxyls/deuteroxyls through H-bonding and this provokes the formation of H-bonded OeH/OeD groups. These later species are relatively stable and gradually vanish with increasing temperatures above 523 K, leaving behind only isolated hydroxyls. Surfaces enriched with H-bonded hydroxyls are characterized with an enhanced NOx storage ability revealing their significant role in low-temperature NOx adsorption mechanism.en_US
dc.description.provenanceSubmitted by Onur Emek (onur.emek@bilkent.edu.tr) on 2020-01-28T06:29:08Z No. of bitstreams: 1 Bilkent-research-paper.pdf: 268963 bytes, checksum: ad2e3a30c8172b573b9662390ed2d3cf (MD5)en
dc.description.provenanceMade available in DSpace on 2020-01-28T06:29:08Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 268963 bytes, checksum: ad2e3a30c8172b573b9662390ed2d3cf (MD5) Previous issue date: 2019en
dc.embargo.release2022-11-01
dc.identifier.doi10.1016/j.cattod.2019.02.056en_US
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/11693/52851
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttps://dx.doi.org/10.1016/j.cattod.2019.02.056en_US
dc.source.titleCatalysis Todayen_US
dc.subjectDeNOx catalysten_US
dc.subjectNOx Reductionen_US
dc.subjectPt/CeOx/ZrOx/γ-Al2O3en_US
dc.subjectH2en_US
dc.subjectD2en_US
dc.subjectD/H exchangeen_US
dc.titleEffects induced by interaction of the Pt/CeO x /ZrO x /γ-Al 2 O 3 ternary mixed oxide DeNO x catalyst with hydrogenen_US
dc.typeArticleen_US

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