TiO2-Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement
Author
Soylu, A. M.
Polat, M.
Erdogan, D. A.
Say, Z.
Yıldırım, C.
Birer, Ö.
Ozensoy, E.
Date
2014Source Title
Applied Surface Science
Print ISSN
0169-4332
Electronic ISSN
1873-5584
Publisher
Elsevier
Volume
318
Pages
142 - 149
Language
English
Type
ArticleItem Usage Stats
110
views
views
91
downloads
downloads
Abstract
TiO2-Al2O3 binary oxide surfaces were utilized in order to develop an alternative photocatalytic NOx abatement approach, where TiO2 sites were used for ambient photocatalytic oxidation of NO with O2 and alumina sites were exploited for NOx storage. Chemical, crystallographic and electronic structure of the TiO2-Al2O3 binary oxide surfaces were characterized (via BET surface area measurements, XRD, Raman spectroscopy and DR-UV-Vis Spectroscopy) as a function of the TiO2 loading in the mixture as well as the calcination temperature used in the synthesis protocol. 0.5 Ti/Al-900 photocatalyst showed remarkable photocatalytic NOx oxidation and storage performance, which was found to be much superior to that of a Degussa P25 industrial benchmark photocatalyst (i.e. 160% higher NOx storage and 55% lower NO2(g) release to the atmosphere). Our results indicate that the onset of the photocatalytic NOx abatement activity is concomitant to the switch between amorphous to a crystalline phase with an electronic band gap within 3.05-3.10 eV; where the most active photocatalyst revealed predominantly rutile phase together and anatase as the minority phase.