Show simple item record

dc.contributor.authorAndonova, S. M.en_US
dc.contributor.authorŞentürk, G. S.en_US
dc.contributor.authorOzensoy, E.en_US
dc.date.accessioned2016-02-08T09:56:33Z
dc.date.available2016-02-08T09:56:33Z
dc.date.issued2010en_US
dc.identifier.issn1932-7447 (print)en_US
dc.identifier.urihttp://hdl.handle.net/11693/22176
dc.description.abstractIn an attempt to control the surface dispersion and the mobility of BaO domains on NOx storage materials, TiO2/TiOx anchoring sites were introduced on/inside the conventional γ-Al 2O3 support matrix. BaO/TiO2/Al 2O3 ternary oxide materials were synthesized via two different sol-gel preparation techniques, with varying surface compositions and morphologies. The synthesized NOx storage materials were studied via XRD, Raman spectroscopy, BET surface area analysis, TPD, XPS, SEM, EDX-mapping, and in situ FTIR spectroscopy of adsorbed NO2. NOx uptake properties of the BaO/TiO2/Al2O3 materials were found to be strongly influenced by the morphology and the surface structure of the TiO2/TiOx domains. An improved Ba surface dispersion was observed for the BaO/TiO2/Al2O3 materials synthesized via the coprecipitation of alkoxide precursors, which was found to originate mostly from the increased fraction of accessible TiO 2/TiOx sites on the surface. These TiO2/ TiOx sites function as strong anchoring sites for surface BaO domains and can be tailored to enhance surface dispersion of BaO. TPD experiments suggested the presence of at least two different types of NOx species adsorbed on the TiO2/TiOx sites, with distinctively different thermal stabilities. The relative stability of the NOx species adsorbed on the BaO/TiO2/Al2O3 system was found to increase in the following order: NO+/N2O 3 on alumina ≪ nitrates on alumina < surface nitrates on BaO < bridged/bidentate nitrates on large/isolated TiO2 clusters < bulk nitrates on BaO on alumina surface and bridged/bidentate nitrates on TiO2 crystallites homogenously distributed on the surface < bulk nitrates on the BaO sites located on the TiO2 domains. © 2010 American Chemical Society.en_US
dc.language.isoEnglishen_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.relation.isversionofhttps://doi.org/10.1021/jp102555cen_US
dc.subjectAlkoxide precursoren_US
dc.subjectAlumina surfaceen_US
dc.subjectBET surface areaen_US
dc.subjectEDX-mappingen_US
dc.subjectIn-situ FT-IRen_US
dc.subjectRelative stabilitiesen_US
dc.subjectSEMen_US
dc.subjectSol gel preparationsen_US
dc.subjectSupport matrixen_US
dc.subjectSurface compositionsen_US
dc.subjectSurface dispersionen_US
dc.subjectSurface nitratesen_US
dc.subjectTernary oxide materialen_US
dc.subjectThermal stabilityen_US
dc.subjectTiOen_US
dc.subjectUptake propertiesen_US
dc.subjectXPSen_US
dc.subjectXRDen_US
dc.subjectAluminumen_US
dc.subjectBariumen_US
dc.subjectDispersionsen_US
dc.subjectFourier transform infrared spectroscopyen_US
dc.subjectMaterialsen_US
dc.subjectMorphologyen_US
dc.subjectNitratesen_US
dc.subjectRaman spectroscopyen_US
dc.subjectSurface morphologyen_US
dc.subjectSurfacesen_US
dc.titleFine-tuning the dispersion and the mobility of BaO domains on NO x storage materials via TiO2 anchoring sitesen_US
dc.typeArticleen_US
dc.departmentDepartment of Chemistryen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.citation.spage17003en_US
dc.citation.epage17016en_US
dc.citation.volumeNumber114en_US
dc.citation.issueNumber40en_US
dc.identifier.doi10.1021/jp102555cen_US
dc.publisherAmerican Chemical Societyen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record