CAJ | 학술논문

采用正、反滴定方法制备Mn改性γ-Fe2O3催化剂(Fe0.7Mn0.3Oz,0.3为Mn物质的量比),考察了滴定方法对催化剂低温SCR脱硝活性的影响,并借助N2吸附-脱附、XRD、SEM及EDS等对催化剂进行表征.结果表明,与正向滴定法相比,反向滴定法能提高催化剂的低温 SCR 活性,优化其活性温度窗口;Fe0.7Mn0.3Oz-R 催化剂在100,℃时的 NOx转化率高达 95.5%,,125~200,℃范围内 NOx转化率可维持近 100%,.较大的比表面积和比孔容、发达的孔隙结构、宽泛的孔径分布、铁锰间的强相互作用及较低结晶度的γ-Fe2O3是Fe0.7Mn0.3Oz-R催化剂具有较高低温SCR活性的主要原因.
채용정、반적정방법제비Mn개성γ-Fe2O3최화제(Fe0.7Mn0.3Oz,0.3위Mn물질적량비),고찰료적정방법대최화제저온SCR탈초활성적영향,병차조N2흡부-탈부、XRD、SEM급EDS등대최화제진행표정.결과표명,여정향적정법상비,반향적정법능제고최화제적저온 SCR 활성,우화기활성온도창구;Fe0.7Mn0.3Oz-R 최화제재100,℃시적 NOx전화솔고체 95.5%,,125~200,℃범위내 NOx전화솔가유지근 100%,.교대적비표면적화비공용、발체적공극결구、관범적공경분포、철맹간적강상호작용급교저결정도적γ-Fe2O3시Fe0.7Mn0.3Oz-R최화제구유교고저온SCR활성적주요원인.
Mn doped γ-Fe2O3 catalysts(Fe0.7Mn0.3Oz,0.3 represents the molar ratio of Mn)were prepared by using positive and reverse titration methods with ammonia as precipitant agent,and the effects of titration methods on the low-temperature selective catalytic reduction(SCR)activity of Fe0.7Mn0.3Oz catalysts were investigated.Catalysts were characterized by N2adsorption-desorption,X-ray diffraction(XRD),scanning electron microscope(SEM)and en-ergy dispersive spectrometer(EDS),respectively.The results show that compared with reverse titration method, positive titration method increases the low-temperature SCR activity and widens the activity temperature window of Fe0.7Mn0.3Ozcatalysts.NOx conversion of Fe0.7Mn0.3Oz-R catalysts is up to 95.5%, at 100,℃,and reaches 100%,at 125—200,℃.Large surface area and pore volume,developed pore structure,broad pore size distribution,strong interaction between iron and manganese,and lowly-crystallized γ-Fe2O3 contribute to the high low-temperature SCR activity of Fe0.7Mn0.3Oz-R catalysts.