CeO_2-WO_3/TiO_2催化剂对燃煤烟气汞的催化氧化  

Mercury Oxidation over CeO_2-WO_3/TiO_2 Catalysts in Coal-Fired Flue Gas

作　　者：张丙凯[1] 杨应举 陈晓毅[1] 屈文麒[1,2] 刘晶[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074 [2]福建省计量科学研究院,福州350003

出　　处：《燃烧科学与技术》2015年第3期236-240,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51376072);国家重点基础研究发展计划(973计划)资助项目(2014CB238904)

摘　　要：采用超声波增强浸渍法合成了CeO2-WO3/TiO2（CeWTi）催化剂，采用BET和XRD等分析手段对催化剂进行了表征．在固定床反应器上研究了 CeO2-WO3/TiO2催化剂在模拟燃煤烟气条件下对单质汞的催化氧化性能及机理．结果表明，该催化剂在较宽温度范围（200-350 ℃）具有很强的汞氧化能力；最佳的 CeO2/WO3/TiO2质量比在0.5∶0.5∶1.0；烟气成分中 NO 和 O2对 CeWTi 催化剂催化氧化汞有明显的促进作用，而 SO2浓度低时对汞的促进作用明显，浓度高时对汞的促进作用减弱；CeWTi催化剂上汞与HCl的反应遵循Langmuir-Hinshelwood机理．Ultrasound-assisted impregnation method was used to synthesize CeO2-WO3/TiO2（CeWTi）catalysts. The synthetic catalysts were characterized by BET surface area and X-ray diffraction（XRD）. The performance of mercury oxidation over CeO2-WO3/TiO2 catalysts in simulated flue gas was tested in a fixed-bed reactor. The results show that CeWTi catalysts with a CeO2/WO3/TiO2 weight ratio of 0.5∶0.5∶1.0 exhibit high mercury oxidation activity within the temperature range from 200 ℃ to 350 ℃. NO and O2 can remarkably promote Hg0 oxidation over CeO2-WO3/TiO2 catalysts. SO2 exhibits a promotional effect on Hg0oxidation at low SO2 concentration. However,the effect becomes weaker at higher SO2 concentration. It is shown experimentally that Hg0oxidation by HCl over CeWTi catalysts fol-lows the Langmuir-Hinshelwood mechanism.

关 键 词：催化剂 燃煤烟气 汞 CeO2-WO3/TiO2 氧化 

分 类 号：TK16[动力工程及工程热物理—热能工程]