Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (11): 5747-5755.DOI: 10.16085/j.issn.1000-6613.2022-2312

• Industrial catalysis • Previous Articles     Next Articles

Catalytic performance of N-doped vanadium-titanium honeycomb catalysts at low temperature

WANG Luzhu1(), AN Jiakang1, ZHANG Tao2, DENG Lifeng2, REN Yingjie2, LI Yang2, LI Tao1(), REN Baozeng1   

  1. 1.Chemical Engineering Institute, Zhengzhou University, Zhengzhou 450001, Henan, China
    2.Jiang Su Longkingcotech Environmental Protection Technology Co. , Ltd. , Yancheng 224000, Jiangsu, China
  • Received:2022-12-13 Revised:2023-02-20 Online:2023-12-15 Published:2023-11-20
  • Contact: LI Tao

氮掺杂钒钛蜂窝式催化剂低温脱硝性能

王露珠1(), 安家康1, 张涛2, 邓立峰2, 任英杰2, 李扬2, 李涛1(), 任保增1   

  1. 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
  • 通讯作者: 李涛
  • 作者简介:王露珠(1993—),女,硕士研究生,研究方向为低温脱硝催化剂。E-mail:wanglz6201@163.com
  • 基金资助:
    河南省重大科技攻关项目(221100320100)

Abstract:

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, H2-TPR, NH3-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 V4+and chemically adsorbed oxygen Oα. With the increase of the acidic sites on the surface, the adsorption capacity of NH3 on the catalyst surface was increased, leading to the enhanced redox capacity and the improved low temperature denitration performance of the catalyst.

Key words: N-doping, vanadium-titanium catalyst, honeycomb catalyst, low temperature denitration

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、H2-TPR、NH3-TPD和O2-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V4+和化学吸附氧Oα的比率增加,表面酸性位点数量增加,使催化剂表面NH3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。

关键词: 氮掺杂, 钒钛催化剂, 蜂窝式催化剂, 低温脱硝

CLC Number: 

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