工业V_2O_5-WO_3/TiO_2催化剂的碱土中毒研究  

Study of alkaline earth poisoning of commercial V_2O_5-WO_3/TiO_2 catalyst

作　　者：盘思伟[1] 阮东亮[2] 韦正乐[1] 黄碧纯[2,3] 程华[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]华南理工大学环境科学与工程学院,广东广州510006 [3]广东省大气环境与污染控制重点实验室,广东广州510006

出　　处：《工业催化》2013年第12期32-36,共5页Industrial Catalysis

摘　　要：以某燃煤电厂应用的V2O5-WO3/TiO2蜂窝型SCR脱硝催化剂为研究对象,在实验室条件下模拟该催化剂Ca、Mg及二者复合中毒,研究了不同浓度的Ca和Mg对催化剂活性的影响,并用XRD、H2-TPR及NH3吸附FT-IR对催化剂进行表征。结果表明,Ca和Mg对工业SCR脱硝催化剂均具有毒性作用,其中Mg毒性相对较强,复合中毒在一定程度上弱化单组分对催化剂活性的影响;催化剂组分分散度和结晶度不受Ca和Mg的影响,但CaO和MgO的掺入抑制V2O5的还原能力;CaO和MgO对催化剂表面的酸性位均存在影响,尤其是B酸位,二者复合中毒对酸性位的影响小于单一组分。The poisoning effects of Ca and Mg on honeycomb SCR catalysts of V2Os-TiO2 for flue gas denitrification used in a coal fired power plant were studied under the laboratory conditions. The catalysts were characterized by means of XRD, H2-TPR and FT-IR. The results indicated that Mg had stronger poisoning effect than Ca, and the interaction between Ca and Mg would weaken the poisoning effect of one component on catalyst activity; Ca and Mg had no influence on the dispersion and crystallinity of the catalyst,but doping their oxides could inhibit the reducing capacity of V2Os ;CaO and MgO had influence on acid sites of the catalyst surface, specially B acid sites. The compound poisoning effect of CaO and MgO on acid sites was less than that of single component.

关 键 词：催化剂工程 烟气脱硝 V2O5-WO3 TiO2 催化剂 碱土金属 中毒 

分 类 号：O643.362[理学—物理化学] TQ426.99[理学—化学]