碱金属对NH_3-SCR脱硝催化剂Ce/TiO_2的毒化研究  

Influence of alkali metals on Ce/TiO_2 catalyst for selective catalytic reduction of no with NH_3

作　　者：周国民[1] 李明圆 付在国 郭瑞堂 ZHOU Guo-min;LI Ming-yuan;FU Zai-guo;GUO Rui-tang(China Shenhua Energy Company Limited Guohua Power Branch,Beijing 100025,China;School of Energy Source and Mechanical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]中国神华能源股份有限公司国华电力分公司,北京100025 [2]上海电力学院能源与机械工程学院,上海200090

出　　处：《应用化工》2018年第12期2616-2619,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目(51606114)

摘　　要：电厂烟气中的碱金属盐(钙、镁等)对SCR脱硝催化剂有明显的毒化失活作用。基于实验研究和BET比表面积、X射线晶体衍射XRD、程序升温还原H_2-TPR、程序升温脱附NH_3-TPD和X射线光电子能谱XPS表征手段,探究解释碱金属Ca、Mg对Ce/TiO_2催化剂的毒化作用。研究表明,碱金属Ca比Mg毒化作用更加明显。实验结果揭示了氧化还原能力和布朗斯特酸位点的降低以及活性氧物种的减少,导致了Ca-Ce/TiO_2、Mg-Ce/TiO_2脱硝催化剂活性的降低。The salts of alkali earth metals(Ca and Mg)in fly ash have a deactivation effect on SCR catalyst.The poisoning effect of Ca and Mg on Ce/TiO2 catalyst was investigated and explained based on experimental and characterization results of BET,XRD,H2-TPR,NH3-TPD and XPS.It was found that the deactivation effect of Ca is more obvious than that of Mg.The results showed that the drop of redox ability and Br nsted acidity,the decrease of active oxygen species led to the decrease of Ca-Ce/TiO2 and Mg-Ce/TiO2.

关 键 词：选择性催化还原 碱土金属 毒化作用 表征 

分 类 号：O643.361[理学—物理化学] O643.362[理学—化学]