TiO2-Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement

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

APPLIED SURFACE SCIENCE, vol.318, pp.142-149, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 318
  • Publication Date: 2014
  • Doi Number: 10.1016/j.apsusc.2014.02.065
  • Journal Name: APPLIED SURFACE SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.142-149
  • Keywords: TiO2, Al2O3, Photocatalysis, NOx abatement, DeNO(x), STORAGE MATERIALS, AIR-POLLUTION, ANATASE, REDUCTION, CATALYSTS, SYSTEMS
  • Gazi University Affiliated: Yes

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 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.