以TiO2为载体,采用浸渍法制备了含 Ce低钒SCR催化剂,在模拟烟气条件下展开脱硝实验.通过 N2吸附-脱附(BET)、X 射线衍射(XRD)、扫描电镜(SEM)、Raman光谱等表征手段和催化活性测试,对该种催化剂和传统的钒钛钨催化剂进行了对比研究.结果表明,掺杂了 Ce 以后活性物种分散性良好,虽然比表面积和孔容孔径略有下降,但并没有影响锐钛型TiO2载体的结构特征.当 CeO2负载量超过5％时,CeO2以立方微晶结构存在于催化剂表面,且形成微量 Ce2(WO4)3物质.掺杂了1％的 CeO2脱硝活性最佳,在空速为125000 h－1,氨氮比为1．0时,活性温度范围内NO 脱除率达到了95％以上.
This paper discussed a recent study of NOx removal by novel Ce doped low vanadium SCR catalysts with TiO2 as support under a bench scale condition.The catalysts were characterized by brunauer-emmett-teller (BET),X-ray diffraction (XRD),scanning electron microscope (SEM),FT-Raman,comparison with the tradi-tional catalyst.The result shows that,BET surface areas and porous volume didn’t have a significant influence on catalytic performance.The amount of doped cerium didn’t affect the structure characteristics of the carrier. When the CeO2 loaded exceeds 5%,cubic crystalline structure of CeO2 exists in the catalyst surface and trace Ce2(WO4)3 was formed.The NOx conversion was up to 95% in the activity temperature range with 1% cerium doped at the gas hourly space velocity of 125 000 h-1,n(NH3)/n(NO)=1.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%