Publication: TiO2–Al2O3 binary mixed oxide surfaces for photocatalytic NOx abatement
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KU-Authors
KU Authors
Co-Authors
Soylu, Asli Melike
Polat, Meryem
Erdogan, Deniz Altunoz
Say, Zafer
Ozensoy, Emrah
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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.
Source
Publisher
Elsevier Science Bv
Subject
Chemistry, Chemistry, physical and theoretical, Materials science, Coatings, Thin films, Physics, Condensed matter
Citation
Has Part
Source
Applied Surface Science
Book Series Title
Edition
DOI
10.1016/j.apsusc.2014.02.065