用于选择性催化还原烟气脱硝的V_2O_5/TiO_2催化剂钾中毒动力学研究  

Kinetic Study on Potassium Poisoning of V_2O_5/TiO_2 Catalysts for Selective Catalytic Reduction of NO in Flue Gas

作　　者：姜烨[1] 张涌新[2] 吴卫红[2] 高翔[2] 

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

出　　处：《中国电机工程学报》2014年第23期3899-3906,共8页Proceedings of the CSEE

基　　金：国家杰出青年科学基金项目(51125025);"十二五"国家科技支撑计划课题(2012BAB18B03)~~

摘　　要：基于催化剂颗粒中毒的渐进壳模型,依据SCR反应的Eley-Rideal机制,对颗粒状V2O5/TiO2催化剂的钾中毒动力学进行研究,建立了V2O5/TiO2催化剂的钾中毒动力学方程。以催化剂的活性保留分率为桥梁,利用模型预测值和实验值建立了催化剂上钾沉积量与反应时间的关系。模拟了烟气中钾浓度和催化剂钾中毒反应速率常数的耦合对催化剂活性保留分率的影响,模型结果催化剂实际运行结果相符合。这表明文中建立的V2O5/TiO2催化剂钾中毒动力学模型是合理的。Based on a model of progressive shell poisoning for a single catalyst particle and Eley-Rideal mechanism of selective catalytic reduction （SCR） reaction, the K-poisoning kinetics of granular V2O5/TiO2 catalysts was studied and their K-poisoning kinetic equation was established. Combining the retention activity of the catalysts from the model simulation with that from the experiments, the relation between K loadings over the catalysts and reaction time was established. The combined effect of K concentration in flue gas and K-poisoning reaction rate constant of the catalysts on the retention activity of the catalysts was simulated based on the established model. The simulated results are in good agreement with the reported operating results of catalysts. This indicates that the established kinetic model on K-poisoning for V205/TiO2 catalysts is rational.

关 键 词：选择性催化还原(SCR) 脱硝 V2O5 TIO2催化剂 钾中毒 动力学 

分 类 号：X511[环境科学与工程—环境工程]