CAJ | 학술논문

本文研究了制备工艺对 TiO2-WO3-V2O5- 载体型催化剂理化特性及其在 NH3-SCR 反应中催化性能的影响.通过 XRD、TG/DTA 等分析方法考察了煅烧温度等对催化剂中各组分晶体结构的影响,确定了制备负载型催化剂的最佳煅烧温度为 500℃.不同制备工艺催化剂理化性能的对比表明,多步浸渍法不仅提高了锐钛矿型 TiO2 向金红石型 TiO2 的转变温度,而且使更多的钒氧化物处于较低的价态,有利于提高还原反应的催化性能;催化活性评价试验也表明使用多步浸渍法制备的 SCR 催化剂具有较高的催化活性和更宽的高活性反应温度窗口.最后考察了反应空速对多步浸渍法所制备催化剂 NOx 转化效率的影响,结果表明:随空速的增加,NOx 转化效率逐渐降低.
본문연구료제비공예대 TiO2-WO3-V2O5- 재체형최화제이화특성급기재 NH3-SCR 반응중최화성능적영향.통과 XRD、TG/DTA 등분석방법고찰료단소온도등대최화제중각조분정체결구적영향,학정료제비부재형최화제적최가단소온도위 500℃.불동제비공예최화제이화성능적대비표명,다보침지법불부제고료예태광형 TiO2 향금홍석형 TiO2 적전변온도,이차사경다적범양화물처우교저적개태,유리우제고환원반응적최화성능;최화활성평개시험야표명사용다보침지법제비적 SCR 최화제구유교고적최화활성화경관적고활성반응온도창구.최후고찰료반응공속대다보침지법소제비최화제 NOx 전화효솔적영향,결과표명:수공속적증가,NOx 전화효솔축점강저.
The influences of the preparation method on the structure and the NH3-SCR catalytic activity of TiO2-WO3-V2O5-support catalysts are studied in details. The crystal structures of the catalysts obtained at different calcination temperature are characterized by XRD, TG/DTA technique,and the results prove that the optimum calcination temperature is 500℃. The prepared method has a significant effect on the catalytic activity of the TiO2-WO3-V2O5 catalysts. The catalyst prepared by repetitious impregnating method exhibits better catalytic activity because of higher conversion temperature of anatase to rutile, the larger content of TiO2 in loading and the more vanadium oxide at lower valency. It is found from the results of the catalytic activity tests that the catalyst prepared by repetitious impregnating method works well in a wide range of reaction temperature. Based on the catalyst prepared by repetitious impregnating method, finally, we investigate its catalytic activity via the space velocity. Experimental results indicate that the removal efficiency of NOx decreases with increase in space velocity.