TiO2-Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement


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Soylu A. M. , Polat M., Erdogan D. , Say Z., Yildirim C., Birer O., et al.

APPLIED SURFACE SCIENCE, cilt.318, ss.142-149, 2014 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 318
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1016/j.apsusc.2014.02.065
  • Dergi Adı: APPLIED SURFACE SCIENCE
  • Sayfa Sayısı: ss.142-149

Özet

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. (C) 2014 Elsevier B.V. All rights reserved.