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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.
Using MnO2 as the active component and Fe2O3 as the additive, the monolithic catalysts with TiO2 and ZrO2-TiO2 as the supports were prepared, and the catalysts were calcined at different temperatures and applied to oxygen-enriched conditions. The selective catalytic reduction of NH3- SCR) and high temperature stability of NOx were studied by means of X-ray diffraction (XRD), BET, OSC and H2-TPR The results showed that ZrO2-TiO2-supported catalyst has good high-temperature thermal stability, high specific surface area and oxygen storage capacity as well as strong oxidation ability.The catalyst activity test results showed that , The monolithic manganese-based catalyst supported on ZrO2-TiO2 significantly improves the low-temperature activity of the NH3-SCR reaction and has a good application prospect.