Fine-tuning the dispersion and the mobility of BaO domains on NO x storage materials via TiO2 anchoring sites
Andonova, S. M.
Şentürk, G. S.
Journal of Physical Chemistry C
American Chemical Society
17003 - 17016
Item Usage Stats
MetadataShow full item record
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.
BET surface area
Sol gel preparations
Ternary oxide material
Fourier transform infrared spectroscopy
Published Version (Please cite this version)https://doi.org/10.1021/jp102555c
Showing items related by title, author, creator and subject.
Surface evolution of 4H-SiC(0001) during in-situ surface preparation and its influence on graphene properties Ul Hassan J.; Meyer, A.; Çakmakyapan, Semih; Kazar, Özgür; Flege J.I.; Falta J.; Özbay, Ekmel; Janzén, E. (Trans Tech Publications, Switzerland, 2013)The evolution of SiC surface morphology during graphene growth process has been studied through the comparison of substrate surface step structure after in-situ etching and graphene growth in vacuum. Influence of in-situ ...
Caglayan H.; Özbay, Ekmel (Optical Society of American (OSA), 2008)We investigated the splitting of surface electromagnetic waves trapped at the output surface of a one-dimensional metallic grating structure. The output gratings of the structure asymmetrically such that the output surfaces ...
Kocabas, A.; Ertas G.; Senlik, S.S.; Aydinli, A. (Optical Society of American (OSA), 2008)Surface-enhanced Raman Scattering (SERS) of rhodamine 6G (R6G) adsorbed on biharmonic metallic grating structures was studied. Biharmonic metallic gratings include two different grating components, one acting as a coupler ...