砷对商业V_2O_5-WO_3/TiO_2催化剂脱硝性能的影响  

Effect of arsenic on de-NO efficiency over commercial V_2O_5-WO_3/TiO_2 catalyst

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

机构地区：[1]华南理工大学环境与能源学院,广东广州510006 [2]广东电网公司电力科学研究院,广东广州510080

出　　处：《化工进展》2014年第4期925-929,946,共6页Chemical Industry and Engineering Progress

摘　　要：以某燃煤电厂钒钛基选择性催化还原(SCR)脱硝催化剂为研究对象,在实验室条件下模拟了该催化剂的As中毒,考察了不同浓度的As对催化剂活性的影响,结合H2-TPR、XPS、NH3吸附FT-IR实验分析As对催化剂性能的影响。结果表明催化剂As中毒后,其活性下降,并且As浓度越大,活性下降越明显;催化剂表面的W和Ti的化学形态不受As的影响,而V物种出现多样化;As对催化剂表面的酸性位有一定的影响,使其吸附NH3的Bronsted酸位减少,而对其酸强度和催化反应途径的影响并不显著。The poisoning effects of As on traditional SCR catalysts based on V2O5-TiO2 used in a coal fired power plant were studied under the laboratory conditions. The catalysts were characterized by means of HE-TPR, XPS and NH3 adsorption FT-IR. The activity of the catalyst decreased after As poisoning, and the higher the concentration of As, the more significant the decrease of catalytic activity. The chemical forms of W and Ti on the surface were not influenced by As, but V presented various states. Arsenic reduced the number of Bronsted acid on the surface, but did not change the acidity and pathway of catalytic reaction significantly.

关 键 词：环境 选择性催化还原 催化剂 V2O5-WO3 TIO2 砷 化学形态 B酸 

分 类 号：TQ426.83[化学工程]