无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2022, Vol. 54 ›› Issue (8): 138-144.doi: 10.19964/j.issn.1006-4990.2021-0702

• 催化材料 • 上一篇    下一篇

MnO x -ZSM-5脱硝催化剂制备的溶剂效应研究

周微1,2,3(),张耿睿3,于海斌2,马新宾1,刘飞4,刘家旭3()   

  1. 1.天津大学化工学院, 天津 300350
    2.中海油天津化工研究设计院有限公司
    3.大连理工大学化工学院
    4.中国石油兰州化工研究中心
  • 收稿日期:2021-11-19 出版日期:2022-08-10 发布日期:2022-08-11
  • 作者简介:周微(1985— ),女,博士,主要研究方向为催化材料的制备和原位表征研究;Email:362200922@163.com

Study on solvent effect on preparation of MnO x -ZSM-5 deNO x catalysts

ZHOU Wei1,2,3(),ZHANG Gengrui3,YU Haibin2,MA Xinbin1,LIU Fei4,LIU Jiaxu3()   

  1. 1.Institute of Chemical Engineering, Tianjin University, Tianjin 300350, China
    2.Center Tech Tianjin Chemical Research and Design Institute Co. Ltd.
    3.Institute of Chemical Engineering, Dalian University of Technology
    4.Lanzhou Petrochemical Research Center, PetroChina
  • Received:2021-11-19 Published:2022-08-10 Online:2022-08-11

摘要:

MnO x -ZSM-5脱硝催化剂具有较好的低温氨选择性催化还原反应(NH3-SCR)活性,因其原料成本低、脱硝效率高等优点成为研究热点。详细叙述了采用蒸干溶剂法、通过调变制备过程中溶剂组成(乙醇和水或其混合溶液)制备系列MnO x -ZSM-5催化剂,并首次研究了“溶剂效应”对催化剂脱硝性能产生影响的原因。利用X射线衍射(XRD)、光电子能谱仪(XPS)、程序升温氨吸附法(NH3-TPD)、N2物理吸附、氢气程序升温还原(H2-TPR)以及扫描电子显微镜(SEM)等表征手段分析了催化剂物化性质、锰存在状态与催化性能之间的相互关系。结果发现,随着溶剂中水分占比的提高,MnO x -ZSM-5脱硝催化剂的比表面积降低,具有高催化活性的Mn4+物种比例迅速下降,这些原因均导致催化剂的脱硝活性逐步降低。说明溶剂组成会影响催化剂的脱硝性能,因此在制备MnO x -ZSM-5脱硝催化剂时选取合适的溶剂是至关重要的,这为如何制备高活性的MnO x -ZSM-5脱硝催化剂提供了重要信息。

关键词: MnO x -ZSM-5, 脱硝催化剂, 氨选择性催化还原反应, 蒸干溶剂法, 溶剂效应

Abstract:

MnO x -ZSM-5 deNO x catalyst has good low?temperature NH3-SCR activity.It has become a research hotspot because of the low raw material cost and high deNO x efficiency.A series of MnO x -ZSM-5 catalysts prepared by adjusting the composition of solvents(ethanol,water or their mixed solutions) with steam dry solvent method was described in detail.The reason of influence of“solvent effect” on the deNO x performance of catalysts was studied for the first time.X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),temperature programmed ammonia adsorption(NH3-TPD),N2 physical adsorption,hydrogen temperature programmed reduction(H2-TPR) and scanning electron microscopy(SEM) were used to analyze the relationship between the physical and chemical properties of the catalyst,the existing state of manganese and the catalytic performance.The results showed that the specific surface area of MnO x -ZSM-5 deNO x catalyst decreased,and the proportion of Mn4+ species with high catalytic activity decreased rapidly with increasing the proportion of water in the solvent,resulting in the gradual decrease of the deNO x activity of the catalyst,which indicated that the solvent composition affected the deNO x performance of the catalyst.Therefore,it was very important to select an appropriate solvent in the preparation of MnO x -ZSM-5 deNO x catalyst,which provided important information on how to prepare high activity MnO x -ZSM-5 deNO x catalyst.

Key words: MnO x -ZSM-5, deNO x catalyst, NH3-SCR, dry solvent method, solvent effects

中图分类号: