制备方法对V-Mo/TiO2催化剂脱硝性能的影响

Effect of preparation methods on denitration performance of V-Mo/TiO2 catalyst

    摘要
  • 摘要: 采用浸渍法、溶胶凝胶法和水热法制备了一系列V-Mo/TiO2催化剂，考察了制备方法对催化剂脱硝性能及抗SO2/H2O性能的研究。并运用XRD、BET、NH3-TPD、H2-TPR、XPS等方法对催化剂的理化性能进行了表征，结果表明，溶胶凝胶法制备的催化剂具有较小的晶粒粒径，较大的比表面积和孔容，较多的表面酸量，较强的氧化还原能力以及较高的V4+和表面活性氧，因此，3% V2O5-6% MoO3/TiO2（sol-gel）催化剂在80-360℃，表现出最佳的脱硝效率；引入10% H2O和0.03% SO2后，NO转化率仅下降7个百分点，表现出最佳的抗SO2/H2O性能。

     

    Abstract: A series of V-Mo/TiO2 catalysts were prepared by impregnation method, sol-gel method and hydrothermal method. The denitrification performance and anti-SO2/H2O performance of the catalysts were investigated.The physical and chemical properties of the catalyst were characterized by XRD, BET, NH3-TPD, H2-TPR and XPS.The results showed that the catalyst prepared by sol-gel method had smaller grain size, larger specific area and pore volume, more surface acidity, stronger redox ability and higher V4+ and surface active oxygen.Therefore, the 3% V2O5-6% MoO3/TiO2 (sol-gel) catalyst exhibited the best denitration efficiency in the temperature range of 80-360℃. After introducing 10% H2O and 0.03% SO2, the NO conversion of 3% V2O5-6% MoO3/TiO2 (sol-gel) catalyst decreased by only 7 percentage points, showing the best resistance to SO2/H2O.

     

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