以ZrO2-TiO2为载体的整体式锰基催化剂应用于低温NH3-SCR反应

摘要

Monolith catalysts were prepared using TiO2 and ZrO2-TiO2 as supports wiith MnO2 as active component and Fe2O3 as promoter.The cataltytic activities at low temperature and stability at high temperature for selective catalytic reduction of NOx with NH3(NH3-SCR) in the presence of excessive O2 were studied after the catalysts calcined at different temperatures.The catalysts were characterized by X-ray diffracuon(XRD),specific surface area measurements (BET),oxygen storage capacity(OSC),and temperature programmed reduction(H2-TPR).The results indicated that the catalyst supported on ZrO2-TiO2 had excellent stability at high temperature,and possessed high specific surface area and oxygen storage capacity,,and had strong redox property.The results of the catalytic activities indicated that the monolith manganese-based catalyst using ZrO2-TiO2 as support had evidently improved the activity of NH3-SCR reaction at low temperature,and it showed great potential for practical application.%以MnO2为活性组分,Fe2O3为助剂,制备了以TiO2及ZrO2-TiO2为载体的整体式催化剂.考察了它们在不同温度焙烧后应用于富氧条件下,NH3选择性催化还原.(NH3-SCR)氮氧化物的低温反应性能和高温稳定性.用X射线衍射(XRD)实验、比表面积测定(BET)、储氧性能测定(OSC)及程序升温还原(H2-TPR)等方法对催化剂进行了表征.结果表明,以ZrO2-TiO2为载体的催化剂具有很好的高温热稳定性,并具有较高的比表面积和储氧能力.同时具有较强的氧化能力.催化剂的活性测试结果表明,以ZrO2-TiO2为载体的整体式锰基催化剂明显地提高了NH3-SCR反应的低温活性,具有良好的应用前景.