TiO2-Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

Soylu, Asli Melike
Polat, Meryem
Altunöz Erdoğan, Deniz
Say, Zafer
Yildirim, Cansu
Birer, Ozgur
Ozensoy, Emrah
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 O-2 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.

Citation Formats
A. M. Soylu et al., “TiO2-Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement,” APPLIED SURFACE SCIENCE, vol. 318, pp. 142–149, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33053.