燃煤烟气中砷对V_2O_5-WO_3/TiO_2 SCR脱硝催化剂性能的影响  

Influence of arsenic in flue gas on the performance of V_2O_5-WO_3/TiO_2 catalyst in selective catalytic reduction of NO_x

作　　者：丁健[1] 刘清才[1] 孔明[1] 林凡[1] 杨剑[1] 任山[1] 

机构地区：[1]重庆大学材料科学与工程学院重庆市能源环境研究中心,重庆400044

出　　处：《燃料化学学报》2016年第4期495-499,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(51274263;51204220);重庆市自然科学基金(cstc2013jj B0035)资助~~

摘　　要：通过将商业V_2O_5-WO_3/TiO_2脱硝催化剂暴露于含As_2O_3烟气中,制备了砷中毒催化剂,并运用X射线衍射(XRD)、比表面积(BET)、NH3化学吸附、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱等技术表征分析了砷对催化剂性能的影响,并提出了催化剂砷中毒机理。结果表明,砷对催化剂具有严重的毒害作用,As_2O_3会吸附在催化剂表面,并被催化剂氧化形成As_2O_5覆盖层,减小催化剂比表面积,减少催化剂V活性位,阻止催化剂对NH3的吸附,造成催化剂失活。The effect of arsenic on the performance of commercial V2O5-WO3/ TiO2 catalyst for selective catalytic reduction（ SCR） of NOxwas investigated with the assistance of XRD, N2 sorption, NH3 chemisorption,FT-IR and XPS; an arsenic poisoning mechanism was proposed. The results illustrated that As2O3 in flue gas is a serious toxicant to the V2O5-WO3/ TiO2catalyst. As2O3 adsorbed on the catalyst are mostly oxidized to As2O5,which covers the catalyst surface and results in a decrease of surface area and active V sites;as a result,the adsorption of NH3 is then inhibited,which leads to the deactivation of the V2O5-WO3/ TiO2catalyst for SCR.

关 键 词：砷中毒 V2O5-WO3/TIO2催化剂 AS2O3 失活 

分 类 号：X703.5[环境科学与工程—环境工程]