WO_3负载量对V_2O_5/WO_3-TiO_2催化剂脱硝性能的影响

Effects of WO_3 loadings on denitration performance of V_2O_5/WO_3-TiO_2 catalysts

采用V_2O_5/WO_3-TiO_2作为脱硝催化剂,考察活性组分V_2O_5和助剂WO_3负载量对催化剂脱硝活性和抗硫抗水性能的影响。结果表明,3%V_2O_5/x WO_3-TiO_2催化剂(x=3%、4%、5%、6%、7%、8%、9%、10%)上NOx转化率随着WO_3负载量增加而升高,催化剂反应温度窗口不断拓宽。单独通水蒸汽及同时通SO2和水蒸汽对催化剂的毒害作用均较强,表明H2O和NH3的竞争吸附是催化剂抗硫抗水性能较差的重要原因。SO_2与H_2O和NH_3反应生成亚硫酸铵盐和硫酸铵盐,导致催化剂孔隙堵塞,催化活性降低。

Using V2O5/WO3 -TiO2 as the SCR catalyst,the effects of the loading amounts of active com- ponents V2Os and additives WO3 on the catalyst performance of denitrification and resistance to sulfur and water were investigated. The experimental results showed that the denitration efficiency over 3% V205/ xWO3 -Ti02 catalysts（x = 3% ,4% ,5% ,6% ,7% ,8% ,9% ） enhanced with the increase of WO3 loadings, and the reaction temperature window of the catalyst was widened towards low temperature region. The catalyst activity decreased when H2O was added into the reaction, no matter with/without SO2, indicating that competitive adsorption of H2O and NH3 were main reason for the decrease of resistance to sulfur and water. On the other hand, SO2 could react with H2O and NH3 to produce ammonium sulfite and ammonium sulfate which could block the catalyst pores and reduce the catalyst activity.