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砷对商业V2O5-WO3/TiO2催化剂脱硝性能的影响

阮东亮1,盘思伟2,韦正乐2,黄碧纯1,程华1   

  1. 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
  • 出版日期:2014-04-05 发布日期:2014-04-05

Effect of arsenic on de-NO efficiency over commercial V2O5-WO3/TiO2 catalyst

RUAN Dongliang1,PAN Siwei2,WEI Zhengle2,HUANG Bichun1,CHENG Hua1   

  1. 1School of Environment &Energy,South China University of Technology,Guangzhou 510006,Guangdong,China;2China Southern Power Grid Co.,Ltd.,Guangzhou 510080,Guangdong,China
  • Online:2014-04-05 Published:2014-04-05

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。

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

Abstract: 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 H2-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.

Key words: environment, SCR, catalyst, V2O5-WO3/TiO2, arsenic, chemical form, Bronsted acid

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