Photocatalytic oxidation of NOx over TiO2/HZSM-5 catalysts in the presence of water vapor: Effect of hydrophobicity of zeolites

Journal of Hazardous Materials
Gaofei GuoChaohai Wei

Abstract

TiO(2) hybridized with HZSM-5 zeolites photocatalysts were prepared by a simple solid state dispersion method. The physicochemical properties of the catalysts were characterized by X-ray diffraction, UV-vis diffuse reflectance and FT-IR spectroscopy. The photocatalytic oxidation of NO(x) over TiO(2)/HZSM-5 having different Si/Al ratios was carried out under various levels of humidity and different pre-adsorption times in dark. The TiO(2)/HZSM-5 composite catalysts exhibited higher NO conversion and lower NO(2) formation than pure TiO(2). Pre-adsorption with water vapor and the high humidity during the photoreaction were harmful to the reactivity of TiO(2) hybridized with hydrophilic HZSM-5 zeolite. However, the photocatalytic reactivity of TiO(2) hybridized with hydrophobic zeolite varied little with increase in humidity. The results indicated that the high photocatalytic reactivity of TiO(2)/HZSM-5 catalysts is largely depended on the hydrophobicity of the zeolites.

References

Oct 25, 2002·Environmental Pollution·J S DaltonG C Allen
Aug 21, 2007·Journal of Hazardous Materials·Tong-xu LiuXiang-zhong Li
Jun 23, 2009·Journal of Hazardous Materials·Shama RehmanN D Gohar
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Dec 8, 2009·Journal of Hazardous Materials·Mangalampalli V Phanikrishna SharmaMachiraju Subrahmanyam

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Citations

Jul 1, 2020·Environmental Science and Pollution Research International·Essam M AbdelsalamYasser Attia Attia
Nov 8, 2013·Physical Chemistry Chemical Physics : PCCP·Ralf DillertDetlef W Bahnemann
Oct 22, 2018·Environmental Science and Pollution Research International·Qianqian HuangChaohai Wei
Mar 25, 2014·Physical Chemistry Chemical Physics : PCCP·Jin Liu, Gaoke Zhang

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