CePO4-TiO2固溶体的NH3-SCR活性

采用共沉淀法合成了不同Ce与Ti摩尔比的CePO₄-TiO₂复合材料,利用XRD、TEM、NH₃-TPD和H₂-TPR技术对其物理化学性质进行了表征,并对其NH₃-SCR活性进行了评价。实验结果表明：随着CePO₄含量的增加,催化剂的活性提高;当Ce与Ti的摩尔比为8:2时催化剂的活性最高,230 ℃的NO转化率达到100%,且具有更广的温度窗口,优于纯CePO₄。表征结果显示,CePO₄与TiO₂形成固溶体后,颗粒尺寸较为均匀,强酸位的数量增多,氧化还原性能提升,从而提高了催化剂的SCR反应活性,同时改善了其抗水抗硫性能。

NH3-SCR activity of CePO4-TiO2 solid solution

CePO₄-TiO₂ catalysts with different molar ratio of Ce to Ti were synthesized by co-precipitation method. The physicochemical characteristics of these catalysts were characterized by XRD,TEM,NH₃-TPD and H₂-TPR,and the NH₃-SCR activities were evaluated. The results indicate that：The catalyst activity is increased with the increase of CePO₄ content,and when the molar ratio of Ce to Ti is 8:2,the catalyst activity is the highest;The NO conversion rate reaches 100% at 230 ℃ and the catalyst had a wider SCR temperature window than pure CePO₄. The characterization results show that after the solid solution is formed with CePO₄ and TiO₂,the particle size is relatively uniform,the number of strong acid sites are increased,and the redox performance is improved,thereby increasing the SCR activity of the catalyst and improving its water and sulfur resistance.