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
无机新型材料——碳资源转化与利用

Ce-MnOx低温净化氮氧化物和一氧化碳的催化性能研究

  • 韩新宇 ,
  • 刘凯杰 ,
  • 边梦瑶 ,
  • 张一波 ,
  • 杨向光
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  • 1.中国科学技术大学,安徽合肥 230026
    2.中国科学院赣江创新研究院
    3.中国科学院长春应用化学研究所
韩新宇(1998— ),男,研究方向为固定源烟气脱硝催化剂的制备、改性及机理研究;E-mail: xinyuhan@mail.ustc.edu.cn

收稿日期: 2021-10-24

  网络出版日期: 2021-12-16

基金资助

国家自然科学基金项目(22072141);国家自然科学基金项目(22176185);国家自然科学基金项目(21872133);中国科学院青年创新促进会人才项目(2018263);江西省自然科学基金项目(20212BAB213032);中国科学院重点部署项目(ZDRWCN-2021-3-3-3);中国科学院赣江创新研究院自主部署项目(E055C003)

Catalytic performance study of Ce-MnOx for low-temperature purification of nitrogen oxides and carbon monoxide

  • Xinyu HAN ,
  • Kaijie LIU ,
  • Mengyao BIAN ,
  • Yibo ZHANG ,
  • Xiangguang YANG
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  • 1. University of Science and Technology of China,Hefei 230026,China
    2. Ganjiang Innovation Academy,Chinese Academy of Sciences
    3. Changchun Institute of Applied Chemistry,Chinese Academy of Sciences

Received date: 2021-10-24

  Online published: 2021-12-16

摘要

为协助工业界实现碳达峰与碳中和的目标,聚焦于低温烟气中氮氧化物(NOx)和一氧化碳(CO)的协同脱除,以铈(Ce)和锰(Mn)的无机盐为前驱体,采用共沉淀法、机械球磨法、溶液燃烧法和溶胶-凝胶法制备了Ce元素改性的Mn基氨选择性催化还原(NH3-SCR)/一氧化碳(CO)氧化双效纳米催化剂。使用固定床-在线质谱/色谱测试系统对催化剂性能进行了评价,并利用X射线衍射、氮气-物理吸附等表征手段对Ce-MnOx纳米催化剂进行了表征分析。结果表明,反向共沉淀法制备的催化剂具有最优的NOx和CO协同脱除性能,在100 000 mL/(g·h)的高空速条件下,140 ℃以上能够实现CO净化率超过85%,100 ℃以上能够脱除气体中80%以上的NOx,且运行20 h后仅出现微弱的性能衰减。其活性组分为具有高比表面积(100 m2/g以上)的CeMnOx,因此能够吸附更多气体进行反应,表现出优异的催化性能。

本文引用格式

韩新宇 , 刘凯杰 , 边梦瑶 , 张一波 , 杨向光 . Ce-MnOx低温净化氮氧化物和一氧化碳的催化性能研究[J]. 无机盐工业, 2021 , 53(12) : 35 -42 . DOI: 10.19964/j.issn.1006-4990.2021-0644

Abstract

In order to assist the industry in achieving the goal of emission peak and carbon neutrality,focusing on the syner-gistic removal of oxynitrides(NOx) and carbon monoxide(CO) in low-temperature flue gas,inorganic salts of cerium(Ce) and manganese(Mn) were used as precursors,then Mn-based ammonia selective catalytic reduction(NH3-SCR)/CO oxidation bi-functional nanocatalysts modified by Ce were prepared by co-precipitation,mechanical ball milling,solution combustion and sol-gel methods.The catalytic performance was evaluated on a fixed bed reactor with online mass spectrometry/chromato-graphy system.The structure of Ce-MnOx nanocatalysts were characterized and analyzed by X-ray diffraction,N2-physisorp-tion and other techniques.The results showed that the catalyst prepared by the reverse co-precipitation method had the best performance for synergistic removal of NOx and CO.At a high space velocity of 100 000 mL/(g·h),more than 85% of CO purification can be achieved above 140 ℃,more than 80% of NOx in the gas can be removed above 100 ℃,and only a slight performance degradation occurs after 20 h of operation.The active component was CeMnOx with a high specific surface area above 100 m2/g,which could adsorb more gas for reaction and showed excellent catalytic performance.

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