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在介质阻挡等离子体放电(DBD)辅助催化剂(6%CuO/15%TiO2/γ-Al2O3,6%CuO/5%CeO2/15%TiO2/γ-Al2O3)反应装置上,研究了4种不同反应条件下(NO+CH4,NO+CH4+O2,NO+CH4+NTP,NO+CH4+O2+NTP)NO和CH4反应,采用BET、XRD、H2-TPR和XPS等手段对催化剂进行了表征.结果表明在上述4种反应条件下,对于NO+CH4的反应,O2的存在有利于NO脱除,在等离子体条件下,O2的加入对NO的转化有所抑制;而等离子体的活化极大增强了NO的低温脱除活性.在等离子体存在条件下,6%CuO/5%CeO2/15%TiO2/γ-Al2O3(6Cu5Ce15TA)对NO的转化率都优于6%CuO/15%TiO2/γ-Al2O3(6Cu15TA).BET结果显示添加TiO2和CeO2于γ-Al2O3表面后,比表面积都有少量降低;而各载体负载6%CuO后比表面积也有所下降.XRD结果表明6Cu15TA和6Cu5Ce15TA催化剂由锐钛矿相TiO2组成,CuO在各催化剂表面呈现高度分散.H2-TPR数据和XPS实验结果显示负载CuO后,催化剂表面的铜物种由高度分散的CuO和嵌入到CeO2或TiO2晶格中Cu2+所组成.6Cu5Ce15TA表面含有较6Cu15TA多的Cu+,从而增强了NO的脱除活性.
Four different reactions were investigated on a DBD assisted catalyst (6% CuO / 15% TiO2 / γ-Al2O3, 6% CuO / 5% CeO2 / 15% TiO2 / γ-Al2O3) (NO + CH4, NO + CH4 + O2, NO + CH4 + NTP, NO + CH4 + O2 + NTP). The BET, XRD, H2-TPR and XPS methods were used to characterize the catalysts. The results show that under the above four reaction conditions, the presence of O2 facilitates the removal of NO for the reaction of NO + CH4. Under the plasma conditions, the addition of O2 suppresses the conversion of NO, while the activation of the plasma is extremely large Enhanced the catalytic activity of NO removal.Under the plasma condition, the conversion of NO to 6% CuO / 15% TiO2 / γ-Al2O3 (6Cu5Ce15TA) γ-Al2O3 (6Cu15TA) .BET results show that after the addition of TiO2 and CeO2 on the γ-Al2O3 surface, the specific surface area decreases slightly, while the specific surface area of 6% CuO also decreases after XRD results show that 6Cu15TA and 6Cu5Ce15TA catalyst Anatase phase TiO2, CuO highly dispersed on the surface of each catalyst.H2-TPR data and XPS experimental results show that after loading CuO, the copper species on the catalyst surface from highly dispersed CuO and embedded in CeO2 or TiO 2 lattice composed of Cu2 + .6Cu5Ce15TA surface contains more than 6Cu15TA Cu +, thereby enhancing the NO removal activity.