操作条件对V_2O_5/TiO_2催化剂选择性催化还原烟气脱硝性能的影响  

Effects of operation conditions on V_2O_5/TiO_2 catalysts performance for selective catalytic reduction of NO in flue gas

作　　者：姜烨[1] 高翔[2] 吴卫红[2] 张涌新[2] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [2]能源清洁利用国家重点实验室(浙江大学),浙江杭州310027

出　　处：《洁净煤技术》2013年第2期55-58,62,共5页Clean Coal Technology

基　　金：浙江省重大科技专项资助项目(2011C13020);山东省自然科学基金资助项目(ZR2011EEQ004);中央高校基本科研业务费专项资金资助项目(12CX06076A)

摘　　要：采用浸渍法制备了V2O5/TiO2催化剂,考察了操作条件对该催化剂选择性催化还原(SCR)烟气脱硝性能的影响。结果表明:在典型的SCR反应温度范围(300～400℃)内,催化剂具有较高的脱硝率(92.7%～98.8%);当反应温度超过400℃时,N2O开始生成,催化剂的选择性下降。空速对催化剂脱硝率的影响与反应温度有关。n(NH3)/n(NO)与催化剂的脱硝率和氨逃逸密切相关。催化剂表现出较广的NO浓度适应性。当O2体积分数超过2%时,可以消除其对催化剂脱硝率的影响;O2是SCR反应过程中被还原活性位再氧化的主要氧源。V2Os/TiO2 catalysts were prepared by impregnation method. Effects of operation conditions on their performance for selective catalytic reduction of NO in flue gas were determined. The results show that the NO removal efficiency is high and the NO conversion reaches from 92.7 percent to 98.8 percent at the typical SCR reaction temperature （ 300 ℃ to 400 ℃ ）. When the reaction temperature exceed 400 ℃, N20 appear, thereby decreasing the catalysts selectivity. The effect of space velocity on NO removal efficiency is related to reaction temperature. The molar ratio of NH3/NO plays an important part in NO removal and NH3 slip. The adaptability of catalysts to NO concentration is wide. 02 is the main oxygen source for active sites and has no influence on NO removal efficiency when its volume fraction exceed 2 percent.

关 键 词：烟气脱硝 选择性催化还原 V2O5 TIO2催化剂 操作条件 

分 类 号：X511[环境科学与工程—环境工程] TD849[矿业工程—煤矿开采]