WO_3/TiO_2-ZrO_2催化剂的高温脱硝性能

Performance of WO_3/TiO_2-ZrO_2 Catalysts for High Temperature Denitrification

以复合氧化物TiO_2-ZrO_2为载体、WO_3为活性组分,制备了适用于高温烟气(500℃以上)脱硝的WO_3/TiO_2-ZrO_2型SCR脱硝催化剂,对催化剂进行了XRD表征,并考察了复合载体的组成、WO_3质量分数和高温焙烧处理对催化剂脱硝性能的影响.结果表明:WO_3/TiO_2-ZrO_2催化剂具有很好的热稳定性,经800℃高温处理后晶相结构保持不变且脱硝效率仅有微弱下降;WO_3质量分数为20%、钛锆比为7∶3和0∶10的2种催化剂具有较好的脱硝性能,能够适用于高温脱硝反应.

With WO3 as the active component and TiO2-ZrO2 as the carrier, WO3/TiO2-ZrO2 SCR catalysts were prepared for high-temperature （〉500 ℃） flue gas denitrification, which were subsequently charac- terized by XRD. Experiments were performed to reveal the effects of TiO2-ZrO2 composition, WO3 loading and high-temperature sintering treatment on the activity of above WO3/TiO2-ZrO2 catalysts. Results indi- cate that the WO3/TiO2-ZrO2 catalysts are thermally stable, and their crystalline structure would not change after high-temperature treatment at 800 ℃, when the corresponding denitrification efficiency would decrease only a little. The two WO3/TiO2-ZrO2 catalysts with 7： 3 or 0：10 mass ratio of TiO2 to ZrO2 and with 20% WO3 exhibit the best SCR performance, which could be used in high-temperature flue gas deni- trification.