학술논문
Photocatalytic oxidation of NO x over TiO2 /HZSM-5 catalysts in the presence of water vapor: Effect of hydrophobicity of zeolites
Document Type
Article
Author
Source
Subject
*PHOTOCATALYTIC oxidation
*TITANIUM dioxide
*NITRIC oxide
*ZEOLITE catalysts
*WATER vapor
*HYDROPHOBIC surfaces
*SOLID state chemistry
*DISPERSION (Chemistry)
*X-ray diffraction
*REACTIVITY (Chemistry)
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Language
ISSN
0304-3894
Abstract
Abstract: TiO2 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 TiO2/HZSM-5 having different Si/Al ratios was carried out under various levels of humidity and different pre-adsorption times in dark. The TiO2/HZSM-5 composite catalysts exhibited higher NO conversion and lower NO2 formation than pure TiO2. Pre-adsorption with water vapor and the high humidity during the photoreaction were harmful to the reactivity of TiO2 hybridized with hydrophilic HZSM-5 zeolite. However, the photocatalytic reactivity of TiO2 hybridized with hydrophobic zeolite varied little with increase in humidity. The results indicated that the high photocatalytic reactivity of TiO2/HZSM-5 catalysts is largely depended on the hydrophobicity of the zeolites. [Copyright &y& Elsevier]