Ce掺杂低钒V2O5-WO3/TiO2催化剂脱除烟气元素汞的研究  

Removal of Gaseous Elemental Mercury over Cerium Doped Low Vanadium Loading V_2O_5-WO_3/TiO_2 in Simulated Coal-Fired Flue Gas

作　　者：万奇[1] 段雷[1] 贺克斌[1] 陈亮[1] 李俊华[1] 

机构地区：[1]清华大学环境学院,环境模拟与污染控制国家重点联合实验室,北京100084

出　　处：《环境科学》2011年第9期2800-2804,共5页Environmental Science

基　　金：国家自然科学基金重点项目(20937002)

摘　　要：制备了Ce掺杂的低矾V2O5-WO3/TiO2催化剂,在模拟燃煤烟气条件下开展Hg0的脱除实验.结果表明该催化剂具有很好的Hg0脱除能力,在200～500℃的温度范围内能脱除烟气中95%的Hg0.催化剂表征结果表明,比表面积、孔容和孔径与汞脱除能力没有显著相关性.XPS的结果表明,催化剂表面的Ce是以Ce4+的形式存在,有利于Hg0的脱除反应.抗硫抗水实验表明,H2O会轻微抑制Hg0的脱除反应,主要原因是H2O和Hg0在样品表面的竞争吸附;SO2会促进Hg0的脱除反应,原因是SO2能增加样品表面的酸吸附位且增加表面Hg0的吸附量.This paper discussed a recent study of mercury removal by gaseous hydrogen chloride over novel Ce doped low vanadium V2O5-WO3/TiO2 catalysts under a bench scale condition.The performances on Hg0 removal over the catalyst were tested in simulated flue gas with 80-100 μg·m-3 Hg0,8% O2,10×10-6 HCl,8% H2O,800×10-6 SO2 and balanced with N2.Results showed that about 95% of Hg0 could be removed.According to the characterization results,BET surface areas had not significant influence on catalytic performance.XPS results indicated that Ce4＋ oxide was a mainly form in the catalysts surface,which was beneficial for Hg0 removal reactions.Water vapor slightly inhibited Hg0 removal efficiency,due to the competitive adsorption,however,SO2 promoted the oxidation reactions,resulting in higher removal efficiencies.

关 键 词：汞脱除 铈掺杂 低矾 烟气 吸附 

分 类 号：X701[环境科学与工程—环境工程]