SCR催化剂的组成对其脱硝性能的影响

在以TiO₂为载体的基础上，考察了活性组分WO₃和V₂O₅的质量分数以及SiO₂和Al₂O₃的加入对SCR催化剂脱硝性能的影响，筛选出的最佳催化剂组成与某商业催化剂的催化活性、制备方法和催化剂组成进行比较。结果表明，SiO₂和Al₂O₃的加入会降低催化剂的脱硝性能，筛选出的最佳催化剂组成为0.5%V₂O₅～10%WO₃/TiO₂；与实验室通过溶胶 凝胶法制备载体然后负载活性组分的制备方法不同，商业催化剂是将粒径均匀的锐钛矿型TiO₂与玻璃纤维（主要成分为SiO₂和Al₂O₃）通过黏合剂混合制备成型的催化剂载体，然后负载活性组分；由于制备方法和催化剂组成等方面的较大差异，0.5%V₂O₅～10%WO₃/TiO₂在低于603K时具有很好的NO脱除率，而商业催化剂在实际烟气温度(603K~663K)范围内，能稳定保持90%以上脱硝率。

Effects of components of SCR catalyst on DeNOx performance

A SCR catalyst was prepared with active components impregnation on the TiO2 made by sol-gel method.With TiO2 as the carrier,the effects of WO3 and V2O5 contents and SiO2 and Al2O3 addition on the DeNOx performance were investigated.It is demonstrated that the addition of SiO2 and Al2O3 can depress the DeNOx performance and 0.5%V2O5~10%WO3/TiO2 is the optimum catalyst within the investigating range.Compared with the commercialized catalyst that is mostly prepared by mixing uniform anatase TiO2 powder and gla...