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

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。

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% H-2O 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.