H2O和SO2对Ce(1)Mn(3)Ti催化剂催化氧化NO性能的影响

Effects of H2O and SO2 on a Ce(1)Mn(3)Ti catalyst for NO catalytic oxidation

    摘要
  • 摘要: 为了提高MNOx/TiO2催化剂催化氧化NO的活性,在载体TiO2上负载醋酸锰的同时掺杂了一定量的硝酸铈,构成了Ce(1)Mn(3)Ti催化剂,并对催化剂进行XRD、BET和XPS等表征。重点考察了H2O和SO2对催化剂活性的影响,通过FT-IR、SEM和BET等表征手段对毒化前后的催化剂组成及结构进行了分析。结果表明,Ce(1)Mn(3)Ti催化剂具有较好的活性,在空速41 000 h-1、NO体积分数为300×10-6及O2含量10%的条件下,反应温度200℃时NO转化率可达58%,250℃时NO转化率达到最高值85%。单独加入4%H2O使得催化剂活性降低,升高反应温度,H2O对催化剂的影响减弱;同时通入4%H2O和100×10-6SO2,在反应温度250℃时,NO转化率下降并维持在48%左右,停止通入后恢复到61%。H2O和SO2使催化剂活性物种硫酸盐化失活。

     

    Abstract: In order to improve the activity of catalytic oxidation of NO over MnOx/TiO2,a certain amount of cerium nitrate was doped into the catalyst while the MnOx/TiO2 catalyst was prepared by impregnation on TiO2.Ce(1)Mn(3)Ti catalyst was characterized,using XRD,BET and XPS.At the same time,the effects of H2O and SO2 on catalytic oxidation of NO were investigated.The deactivation mechanisms in the presence of H2O and SO2 were analyzed by FT-IR,SEM and BET.The results showed that Ce(1)Mn(3)Ti yielded a 58% NO conversion at 200℃,and 85% at 250℃ when the space velocity was 41 000 h-1,O2 and NO concentrations were 10% and 300×10-6respectively.The activity of catalyst declined in the presence of only 4% H2O but this negative effect could be counteracted by increasing the reaction temperature.After in the presence of 4%H2O and 100×10-6 SO2 together,NO conversion was maintained at 48%.The activity of the deactivated catalyst could recover to 61% after removing H2O and SO2.H2O and SO2 make catalyst deactivation because of the active component has been sulfuric acid stalinization.

     

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