γ-Al_2O_3负载Mn基催化剂低温催化臭氧氧化NO  

Catalytic ozonation of NO by Mn-based catalysts using γ-Al_2O_3 as supporter at low temperature

作　　者：唐云 杨凤林[1] 刘冰[1] TANG Yun;YANG Fenglin(LIU Bing Key Laboratory of Industrial Ecology and Environmental Engineering,Ministry of Education,School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院工业生态与环境工程教育部重点实验室,大连116024

出　　处：《环境工程学报》2018年第9期2540-2547,共8页Chinese Journal of Environmental Engineering

摘　　要：利用等体积浸渍法制备γ-Al_2O_3负载Mn基催化剂,考察了掺杂元素种类,掺杂元素与Mn元素摩尔比以及煅烧温度对NO低温(100℃)催化氧化活性的影响,并对催化剂在有SO_2或H_2O的烟气中的稳定性进行了探究。结果表明,掺杂元素为Ce,Ce/Mn=0.4,煅烧温度为500℃条件下制备的催化剂NO催化活性最佳,在NO体积浓度为500×10^(-6),臭氧浓度为20.9 mg·L^(-1),n(O_3)/n(NO)=0.2,反应温度为100℃,模拟烟气总流量为1.0 L·min^(-1),模拟烟气相对湿度为4%的条件下,NO的转化率最高可达70%。此外,还对催化剂在不同条件下的稳定性和活性恢复情况进行了探究。实验最终实现了在低O_3浓度条件下达到较高NO转化率的目的,为烟气脱硝提供了一种具有应用潜力的新技术。A series of Mn-based catalysts using γ-Al2O3 as supporter was prepared by incipient wetness impregnation. The effects of doping metal elements, the molar ratio of Ce/Mn and calcination temperature were investigated under low temperature（100 ℃） in this research. Moreover, the stablility of catalyst was tested in the simulated gas containing SO2 or H2O. The results suggested that Mn Ox-CeOx/γ-Al2O3 with mass ratio of 0.4 and calcination temperature of 500 ℃ got the highest activity at about 70% under the condition where initial concentration of NO was 500×10^（-6）, inlet ozone concentration was 20.9 mg·L^（-1）, the molar ratio of O3 and NO was 0.2, reaction temperature was 100 ℃,the total gas flow was 1.0 L·min^（-1） and relative humidity was 4%. Moreover, the stability under different situations and reactivation of catalyst was explored as well. Finally the experiment achieved a high conversion rate of NO under a low concentration of O3, which could be a new promising technology for denitrogenation from flue gas.

关 键 词：Mn基催化剂 NO催化臭氧氧化 低温 稳定性 活性恢复 

分 类 号：X511[环境科学与工程—环境工程]