Nature of the Ti-Ba interactions on the BaO/TiO2/Al 2O3 NOx storage system
Author
Andonova, S. M.
Şentürk, G. S.
Kayhan, E.
Ozensoy, E.
Date
2009Source Title
Journal of Physical Chemistry C
Print ISSN
1932-7447
Volume
113
Issue
25
Pages
11014 - 11026
Language
English
Type
ArticleItem Usage Stats
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Abstract
A ternary oxide-based NO* storage material in the form of BaOZTiO2Zy-Al2O3 was synthesized and characterized. Thermally induced structural changes occurring on the surfaces of the TiO2Zy-Al2O3 and BaOZ TiO 2Zy-Al2O3 systems were studied in a comparative manner within 300-1273 K via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, and BET surface area analysis. The surface acidity of the studied oxide systems was also investigated via pyridine adsorption monitored by in-situ Fourier transform infrared (FTIR) spectroscopy. BaO/TiO2γ-Al 2O3 ternary oxide was synthesized by incorporating different loadings of (8-20 wt %) BaO onto the TiO2/γ Al 2O3 support material, which was originally prepared using the sol-gel method. In the TiO2Zy-Al2O3 binary oxide support material, anatase phase exhibited a relatively high thermal stability at T < 1073 K. The presence of TiO2 domains on the surface of the alumina particles was found to alter the surface acidity of alumina by providing new medium-strength Lewis acid sites. SEMZEDX results indicate that in the BaO/TiO2γ-Al2O3 system, TiO2 domains present a significant affinity toward BaO and/or Ba(NO3) 2 resulting in a strong Ti-Ba interaction and the formation of overlapping domains on the surface. The presence of TiO2 also leads to a decrease in the decomposition temperature of the Ba(N03) 2 phase with respect to the Ti-free Ba(N03) 2ZyAl2O3 system. Such a destabilization is likely to occur due to a weaker interaction between Ba(N03) 2 and y-Al203 domains in the ternary oxide as well as due to the change in the surface acidity in the presence of TiO 2. At relatively high temperatures (e.g., 873-1273 K) formation of complex structures in the form of BaTiO3, Ba1.23Al 2.46Ti5.54O16, BaTiO5, andor Ba x:AlyTizOn., were also observed. © 2009 American Chemical Society.
Keywords
Alumina particlesAnatase phase
BET surface area
Binary oxides
Complex structure
Decomposition temperature
Energy dispersive x-ray
High temperature
High thermal stability
In-situ
Lewis acid site
Oxide systems
Pyridine adsorption
SEM
Sol-gel methods
Storage systems
Structural change
Support materials
Surface acidity
Ternary oxides
Thermally induced
TiO
Adsorption
Aluminum
Barium
Fourier transform infrared spectroscopy
Gelation
Raman spectroscopy
Scanning electron microscopy
Sol-gel process
Surface analysis
Surfaces
Titanium dioxide
Titanium oxides
X ray diffraction
X ray diffraction analysis
Barium compounds