过渡金属掺杂对MnO_(x)-CeO_(2)低温SCR性能的影响  

Influence of Transition-metal Doping on MnO_(x)-CeO_(2)Catalyst for Selective Catalytic Reduction at Low Temperature

作　　者：孙雨霖 王智化[1] 唐海荣 班云飞 刘佩希 何勇[1] 朱燕群[1] Sun Yulin;Wang Zhihua;Tang Hairong;Ban Yunfei;Liu Peixi;He Yong;Zhu Yanqun(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027 [2]中国核动力研究设计院,成都610213

出　　处：《燃烧科学与技术》2024年第1期17-24,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52125605);中央高校基本科研业务费专项资金资助项目(2022ZFJH004).

摘　　要：通过水解驱动氧化还原法合成了掺杂过渡金属的2Mn-Ce-M(M为Fe,Cu,Ni,Cr)催化剂,考察了过渡金属掺杂对低温SCR脱硝性能的影响.其中2Mn-Ce-0.2Cr催化剂比表面积较大,氧化还原能力适中,具有丰富的酸性位点和氧空位、最高的化学吸附氧含量及酸位强度,有利于低温下NH_(3)-SCR反应的顺利进行.2Mn-Ce-0.2Cr催化剂的低温NH_(3)-SCR活性最好,能在100~225℃的宽温度区间内保持80%以上的NO_(x)转化率,在125℃时NO_(x)转化率更是达到99.1%,为中低温催化还原烟气中的NO_(x)提供了新思路.此外,2Mn-Ce-0.2Cr还具有良好的抗硫抗水能力,在150℃下,加入40×10^(-6)的SO_(2)反应5 h,其催化活性稳定在98%;在3%的水蒸气下,其效率保持在95%以上.The 2Mn-Ce-M catalysts(M=Fe,Cu,Ni,Cr)were synthesized by hydrolysis driving redox method to investigate the effect of transition metal doping on the SCR performance at low temperature.Among them,2Mn-Ce-0.2Cr catalyst has larger specific surface area,moderate redox capacity,rich acid sites and oxygen vacancies,and the highest chemisorption oxygen content and acid site strength,which is conducive to the smooth progress of NH_(3)-SCR reaction at low temperature.Meanwhile,the 2Mn-Ce-0.2Cr catalyst has the best lowtemperature NH_(3)-SCR activity.It can maintain more than 80%NO_(x)conversion in the wide temperature range of 100—225℃and reach 99.1%NO_(x)conversion at 125℃,which provides a new idea for NO_(x)catalytic reduction in flue gas at medium and low temperature.It also has good resistance to sulfur and water.With 40×10^(-6)SO_(2)added at 150℃,its catalytic activity stabilized at 98%after 5 hours of reaction.What’s more,its efficiency remained above 95%with the introduction of 3%water vapor.

关 键 词：过渡金属掺杂 MnO_(x)-CeO_(2) 低温SCR 水解驱动氧化还原法 

分 类 号：X511[环境科学与工程—环境工程]