氮掺杂钒钛蜂窝式催化剂低温脱硝性能  

Catalytic performance of N-doped vanadium-titanium honeycombcatalysts at low temperature

作　　者：王露珠 安家康 张涛 邓立峰 任英杰 李扬 李涛[1] 任保增[1] WANG Luzhu;AN Jiakang;ZHANG Tao;DENG Lifeng;REN Yingjie;LI Yang;LI Tao;REN Baozeng(Chemical Engineering Institute,Zhengzhou University,Zhengzhou 450001,Henan,China;Jiang Su Longkingcotech Environmental Protection Technology Co.,Ltd.,Yancheng 224000,Jiangsu,China)

机构地区：[1]郑州大学化工学院,河南郑州450001 [2]江苏龙净科杰环保技术有限公司,江苏盐城224000

出　　处：《化工进展》2023年第11期5747-5755,共9页Chemical Industry and Engineering Progress

基　　金：河南省重大科技攻关项目(221100320100)。

摘　　要：为了提升催化剂的低温脱硝性能,利用挤出成型法制备了一系列氮掺杂钒钛蜂窝式催化剂,考察了氮掺杂量对催化剂低温脱硝性能的影响及其稳定性,并通过XRD、BET、SEM、XPS、H_(2)-TPR、NH_(3)-TPD和O_(2)-TPD等分析方法表征催化剂。结果表明:氮掺杂钒钛催化剂的低温脱硝性能显著提高,在140~200℃温度区间催化剂的脱硝性能良好,其中以氮钛摩尔比为0.2的催化剂具有最优的脱硝效果,并在200℃连续72h的稳定性测试过程中,表现出了良好的脱硝稳定性。氮掺杂能够使钒钛催化剂颗粒粒径变小,比表面积和孔容增大,表面V^(4+)和化学吸附氧O_(α)的比率增加,表面酸性位点数量增加,使催化剂表面NH_(3)吸附能力增强,氧化还原能力提高,促进了催化剂低温脱硝性能的提升。In order to enhance the performance of low-temperature denitration catalyst,a series of nitrogen doped vanadium titanium honeycomb catalysts were prepared by extrusion molding.The effect of nitrogen doping amount on the low-temperature activity and stability of the catalyst were discussed.The catalysts were characterized by XRD,BET,SEM,XPS,H_(2)-TPR,NH_(3)-TPD and O2-TPD.The results showed that nitrogen doping significantly enhanced the low temperature denitration performance of the catalysts,which worked well in the temperature range of 140—200℃.Among them,the catalyst with the molar ratio of nitrogen to titanium of 0.2 had the best deNO_(x)efficiency.During the 72-hours stability test at 200℃,the NO conversion rate was basically kept at 86.6%.Nitrogen doping could reduce vanadium titanium catalyst particle size,increase the specific surface area and pore volume,as well as the ratio of surface V^(4+)and chemically adsorbed oxygen O_(α).With the increase of the acidic sites on the surface,the adsorption capacity of NH_(3)on the catalyst surface was increased,leading to the enhanced redox capacity and the improved low temperature denitration performance of the catalyst.

关 键 词：氮掺杂 钒钛催化剂 蜂窝式催化剂 低温脱硝 

分 类 号：X511[环境科学与工程—环境工程] TQ032[化学工程]