立方相纳米氧化锆基催化剂脱硝机理研究  

Denitration Mechanism of Nano Cubic Zirconium Oxide-based Catalysts

作　　者：刘荣[1,2] 季凌晨 叶飞[1,2] 管昊[1,2] 许一凡[1,2] 

机构地区：[1]南京师范大学地理科学学院,江苏省物质循环与污染控制重点实验室,南京210023 [2]江苏省地理信息资源开发与利用协同创新中心,南京210023

出　　处：《硅酸盐通报》2015年第10期2979-2984,共6页Bulletin of the Chinese Ceramic Society

基　　金：江苏省环保厅基金项目(2013032);国家863计划项目基金(2013AA065401);江苏高校优势学科建设工程资助项目

摘　　要：以纳米c-ZrO2为载体,用浸渍法制备出MnOx-CeO2/c-ZrO2催化剂,考察了组分负载量、反应温度对催化剂NH3-SCR脱硝活性影响,探讨了催化剂表面织构特征,分析了催化剂脱硝活性机理。结果显示,增加活性组分负载量和反应温度,催化剂脱硝效率增加,100℃时,2.5%MnOx-CeO2/c-ZrO2脱硝效率为65.3%,15%MnOx-CeO2/cZrO2脱硝效率达97.9%。XRD、BET、XPS、H2-TPR表征结果表明,负载后催化剂表面织构对脱硝反应有利。NH3-TPD测试显示,MnOx-CeO2/c-ZrO2催化剂表面Lewis酸位为强酸性位,NH3吸附在Lewis酸性位形成配位态NH3,经生成NH2NO最后分解为N2和H2O。The MnOx-CeO2/c-ZrO2 catalyst was prepared by impregnation with nanosized c-ZrO2 as the vector.The influence of active component and reaction temperature on catalytic performance of catalyst was investigated while surface characteristics of catalyst and catalytic mechanism were discussed.The NO conversion improved as active component increased and reaction temperature rose.The NO conversion of 2.5% MnOx-CeO2/ c-ZrO2 catalyst at 100 ℃ was 65.3% while 15% MnOx-CeO2/c-ZrO2 catalyst was 97.9%.The results of XRD,SEM,BET and H2-TPR analysis showed that surface structure of loaded catalyst was good for denigration.The results of NH3-TPD shows Lewis acid sites at the surface of MnOxCeO2/ c-ZrO2 catalyst was strong and NH3 adsorbed at Lewis acid sites was coordination NH3 which generated N2 and H2O through intermediate product NH2NO.

关 键 词：立方氧化锆 MnOx-CeO2/c-ZrO2催化剂 脱硝活性 

分 类 号：TQ426[化学工程]