CeO2与WO3协同作用对CeO2-WO3催化剂脱硝性能影响的研究

Study on the synergistic effect of CeO2 and WO3 on the catalytic performance of CeO2-WO3 for the selective catalytic reduction of NOx by NH3

采用原位自组装法分别制备纯CeO2、WO3和CeO2-WO3(CW)催化剂,并研究其NH3选择性催化还原NOx的催化活性。结果表明,WO3的加入使得CW催化剂以微孔为主且具有最大的孔容和较大的比表面积,提高了其催化性能。WO3的加入增强了Ce和W之间的相互作用,显著地提升了Ce^3+和Oα的含量。CW催化剂具有最多的酸性位点。因此,CW催化剂催化活性最好,在250-400℃温度下NOx转化率为100%。

The CeO 2, WO 3 and CeO 2-WO 3 (donated as CW) catalysts were prepared by in-situ self-assembly method and used for the low-temperature selective catalytic reduction (SCR) of NO x with NH 3. The results showed that CW catalysts possessed the most microspore and maximum pore volume and larger specific surface area with the addition of WO 3, resulting in the improvement to the catalytic performance. Besides, the interaction of Ce and W was improved by the introduction of WO 3, which could increase the amount of Ce^3+ and O α. Meanwhile, the enhancement of weak and medium strong acid sites was caused by the introduction of WO 3. Thus, CW catalyst showed the best SCR activity and its NO x conversion at the value of 100% maintained in a wide temperature window ranging from 250 to 400 ℃.