以堇青石和二氧化钛为载体脱硝催化剂性能

Performance of deNOx catalyst supported on cordierite-TiO2 carrier

采用改性堇青石和锐钛型二氧化钛为载体,以偏钨酸氨为WO3(助剂)的前驱体,以偏钒酸铵为V2O5(活性组分)的前驱体,通过混合、挤出、干燥和煅烧等工艺制备出蜂窝式SCR脱硝催化剂,采用N2-吸附仪(BET)、X-射线衍射分析仪(XRD)、模拟烟气活性分析装置和磨损装置,再通过催化剂样品的吸水率和收缩率对比分析。考察催化剂样品的比表面积、晶相结构、耐磨损性能、脱硝活性及其吸水率和收缩率变化。结果表明,以10%堇青石和二氧化钛为载体制备出的催化剂比表面积大,晶相结构以堇青石和锐钛矿型二氧化钛为主,其磨损率低,吸水率和收缩率变化小,脱硝率在80%以上时,与商业催化剂相比,反应温度窗口从300～400℃拓宽为250～460℃。

Using modified cordierite and anatase-TiO2 as the carrier, WO3 as the addition agent and V205 as the active component, V2Os-WO3/Cordierite-TiO2 honeycomb selective catalytic reduction （SCR） for DeNOx application was prepared though mixing, extrusion, drying and calcination process. The surface area and crystal structure of V2Os-WO3/Cordierite-TiO2 catalyst were studied by BET and XRD. The abrasion resistance, water- absorption ratio, shrinkage ratio and activity were investigated by simulated flue gas analyzer and abration equip- ment, then through the comparison of water absorption and shrinkage of the catalyst samples. The results indica- ted that BET of 1% V205-WO3/10% Cordierite-TiO2 was larger than commercial catalyst, main crystalline phase of it was cordierite and anatase-TiO2, the abration ratio, water-absorption and shrinkage ratio of it were lower. When denitrification rate of it was above 80% , the temperature window of its activity could be widened from 300- 400℃, to 250 -460℃, compared with commercial catalysts.