CAJ | 학술논문

以纳米m-ZrO2为载体,用浸渍法制备出MnOx-CeO2/m-ZrO2催化剂,考察反应温度、活性组分负载量对催化剂NH3-SCR脱硝活性影响,探讨催化剂表面织构特征,分析催化剂脱硝活性机制.结果表明,在低温脱硝温度范围,提高反应温度、增加活性组分负载量,有利于催化剂脱硝效率的增加.110℃时,2.5％MnOx-CeO2/m-ZrO2脱硝效率为55.5％,15％MnOx-CeO2/m-ZrO2脱硝效率达93.5％. XRD、BET、XPS、H2-TPR表征结果表明,催化剂表面具有良好的氧化还原能力,表面织构对脱硝反应有利. NH3-TPD测试显示,MnOx-CeO2/m-ZrO2催化剂的脱硝反应机制为：NH3吸附在催化剂表面的Lewis酸性位和Br?nsted酸性位上,通过反应生成相应中间产物NH2 NO或NH4 NO2,中间产物进一步分解最终转变为N2和H2 O；催化剂总脱硝反应效率中,在Lewis酸性位上的脱硝反应占比较大.
이납미m-ZrO2위재체,용침지법제비출MnOx-CeO2/m-ZrO2최화제,고찰반응온도、활성조분부재량대최화제NH3-SCR탈초활성영향,탐토최화제표면직구특정,분석최화제탈초활성궤제.결과표명,재저온탈초온도범위,제고반응온도、증가활성조분부재량,유리우최화제탈초효솔적증가.110℃시,2.5％MnOx-CeO2/m-ZrO2탈초효솔위55.5％,15％MnOx-CeO2/m-ZrO2탈초효솔체93.5％. XRD、BET、XPS、H2-TPR표정결과표명,최화제표면구유량호적양화환원능력,표면직구대탈초반응유리. NH3-TPD측시현시,MnOx-CeO2/m-ZrO2최화제적탈초반응궤제위：NH3흡부재최화제표면적Lewis산성위화Br?nsted산성위상,통과반응생성상응중간산물NH2 NO혹NH4 NO2,중간산물진일보분해최종전변위N2화H2 O；최화제총탈초반응효솔중,재Lewis산성위상적탈초반응점비교대.
The MnOx-CeO2/m-ZrO2 catalyst was prepared by impregnation with nano monoclinic-phase zirconium ( m-ZrO2 ) as the supporter. The influence of active component and reaction temperature on the denitration performance of the catalyst was investigated, while the surface properties of the catalyst and the denitration mechanism were discussed. The denitration efficiency was improved as the active component increased and the reaction temperature rose. The denitration efficiency of 2. 5% MnOx-CeO2/m-ZrO2 catalyst at 110℃ was 55. 5% while that of 15% MnOx-CeO2/m-ZrO2 catalyst was 93. 5%. The results of XRD, SEM, BET and H2-TPR showed that the surface structure of the loaded catalyst was beneficial for denitration and oxidation-reduction. NH3-TPD test demonstrated that NH3 was adsorbed at the Lewis acid sites and Br?nsted acid sites on the surface of catalysts. Intermediate products NH2 NO and NH4 NO were generated from a series of reactions between NO and NH3 and finally transformed into N2 and H2 O. Most of the denitration process happened at Lewis acid sites.