Effects of components of SCR catalyst on DeNOx performance
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摘要: 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。
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关键词:
- 选择性催化还原 /
- 氮氧化物 /
- V2O5-WO3/TiO2 /
- 商业SCR催化剂
Abstract: 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 glass fibers with binding to mold certain-shape support and then impregnating active components on the support, the catalyst of 0.5%V2O5~10%WO3/TiO2 shows an excellent NO removal efficiency below 603K, while the commercialized one shows more than 90% of DeNOx efficiency at 603K~663K, which can be attributed to the differences of preparation method and components.-
Key words:
- selective catalytic reduction (SCR) /
- NOx /
- V2O5-WO3/TiO2 /
- commercialized SCR catalyst
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