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      Fine-tuning the dispersion and the mobility of BaO domains on NO x storage materials via TiO2 anchoring sites

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      Author
      Andonova, S. M.
      Şentürk, G. S.
      Ozensoy, E.
      Date
      2010
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447 (print)
      Publisher
      American Chemical Society
      Volume
      114
      Issue
      40
      Pages
      17003 - 17016
      Language
      English
      Type
      Article
      Item Usage Stats
      138
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      98
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      Abstract
      In 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.
      Keywords
      Alkoxide precursor
      Alumina surface
      BET surface area
      EDX-mapping
      In-situ FT-IR
      Relative stabilities
      SEM
      Sol gel preparations
      Support matrix
      Surface compositions
      Surface dispersion
      Surface nitrates
      Ternary oxide material
      Thermal stability
      TiO
      Uptake properties
      XPS
      XRD
      Aluminum
      Barium
      Dispersions
      Fourier transform infrared spectroscopy
      Materials
      Morphology
      Nitrates
      Raman spectroscopy
      Surface morphology
      Surfaces
      Permalink
      http://hdl.handle.net/11693/22176
      Published Version (Please cite this version)
      https://doi.org/10.1021/jp102555c
      Collections
      • Department of Chemistry 594
      • Institute of Materials Science and Nanotechnology (UNAM) 1776
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