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首页> 外文期刊>Journal of Hazardous Materials >Photocatalytic oxidation of NO_x over TiO_2/HZSM-5 catalysts in the presence of water vapor: Effect of hydrophobicity of zeolites
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Photocatalytic oxidation of NO_x over TiO_2/HZSM-5 catalysts in the presence of water vapor: Effect of hydrophobicity of zeolites

机译：水蒸气存在下TiO_2 / HZSM-5催化剂上NO_x的光催化氧化：沸石疏水性的影响

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摘要

TiO_2 hybrtdized wrth 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.
机译：采用简单的固态分散法制备了TiO_2杂化的HZSM-5分子筛光催化剂。通过X射线衍射，紫外可见漫反射和红外光谱对催化剂的理化性质进行了表征。在不同的湿度和黑暗条件下，在不同的湿度和不同的预吸附时间下，在具有不同Si / Al比的TiO_2 / HZSM-5上进行NO_X的光催化氧化。 TiO_2 / HZSM-5复合催化剂比纯TiO_2具有更高的NO转化率和更低的NO_2生成率。水蒸气的预吸附和光反应过程中的高湿度对与亲水性HZSM-5分子筛混合的TiO_2的反应性有害。然而，与疏水沸石杂化的TiO_2的光催化反应性随湿度的增加而变化很小。结果表明，TiO_2 / HZSM-5催化剂的高光催化活性很大程度上取决于沸石的疏水性。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第15期|p.39-45|共7页
  • 作者

    Gaofei Guo; Yun Hu; Shumei Jiang; Chaohai Wei;

  • 作者单位

    The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China;

    The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China;

    The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China;

    The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    photocatalysis; NO_x oxidation; TIO_2; hzsm-5 zeolites; water vapor;

    机译：光催化;NO_x氧化;TIO_2;hzsm-5沸石;水蒸气;

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