CAJ | 학술논문

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．
채용초성파증강침지법합성료CeO2-WO3/TiO2(CeWTi)최화제，채용BET화XRD등분석수단대최화제진행료표정．재고정상반응기상연구료 CeO2-WO3/TiO2최화제재모의연매연기조건하대단질홍적최화양화성능급궤리．결과표명，해최화제재교관온도범위(200～350,℃)구유흔강적홍양화능력；최가적 CeO2/WO3/TiO2질량비재0.5∶0.5∶1.0；연기성분중 NO 화 O2대 CeWTi 최화제최화양화홍유명현적촉진작용，이 SO2농도저시대홍적촉진작용명현，농도고시대홍적촉진작용감약；CeWTi최화제상홍여HCl적반응준순Langmuir-Hinshelwood궤리．
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.