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 ›› 2023, Vol. 55 ›› Issue (7): 115-121.doi: 10.19964/j.issn.1006-4990.2022-0640

• 催化材料 • 上一篇    下一篇

不同元素掺杂锰基催化剂的NH3-SCR反应性能研究

谭仁俊1(), 罗仕忠1(), 王涛1, 杜沛佞1, 敬方梨2   

  1. 1.四川大学化学工程学院,四川 成都 610065
    2.西南石油大学化学化工学院,四川 成都 610599
  • 收稿日期:2022-11-01 出版日期:2023-07-10 发布日期:2023-07-13
  • 通讯作者: 罗仕忠(1965— ),男,研究员,研究方向为工业催化;E-mail:luosz@scu.edu.cn
  • 作者简介:谭仁俊(1998— ),男,硕士研究生,研究方向为脱硝催化剂;E-mail:1532811460@qq.com

Study on NH3-SCR performance of manganese based catalysts doped with different elements

TAN Renjun1(), LUO Shizhong1(), WANG Tao1, DU Peining1, JING Fangli2   

  1. 1. School of Chemical Engineering,Sichuan University,Chengdu 610065,China
    2. College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610599,China
  • Received:2022-11-01 Published:2023-07-10 Online:2023-07-13

摘要:

为了研究催化剂的酸碱性和氧化还原能力对纯锰氧化物催化剂的NH3-SCR(选择性催化还原)反应性能影响,选取碱土金属Sr、过渡金属Ce、Fe和非金属Si对纯锰氧化物催化剂进行改性,所有催化剂均采用共沉淀法制取。通过XRD、N2-BET、NH3-TPD、XPS和H2-TPR表征手段对催化剂进行分析。XRD结果表明,实验采用的制备方法制备的锰基催化剂主要物相为Mn2O3和Mn5O8;N2-BET结果显示,Ce、Fe、Si 3种元素能有效增加纯锰氧化物的比表面积;NH3-TPD和XPS结果证明,Ce、Fe、Si的引入使得纯锰氧化物的表面吸附氧(O)、Mn4+含量提高,Ce和Si的掺杂增加了催化剂的总酸量,Fe则有效调控了酸性位的分布;H2-TPR结果表明,除Ce外其余元素均使纯锰氧化物催化剂的氧化还原能力有所减弱。对所有催化剂在100~400 ℃进行脱硝活性测试,MnCeO x 表现出优异的低温脱硝活性,MnSiO x 表现出不错的中高温脱硝活性。

关键词: NH3-SCR, Mn2O3, Mn5O8

Abstract:

In order to study the influence of the acid-base and redox capacity of the catalyst on the NH3-SCR performance of pure manganese oxide catalyst,the alkaline earth metals of Sr,transition metals of Ce,Fe and nonmetal of Si were selected to modify the pure manganese oxide catalyst.All catalysts were prepared by coprecipitation method.The catalysts were characterized by XRD,N2-BET,NH3-TPD,XPS and H2-TPR.The XRD results showed that the main phases of the manganese-based catalyst prepared by the method used in this experiment were Mn2O3 and Mn5O8.The N2-BET results showed that Ce、Fe、Si could effectively increase the specific surface area of pure manganese oxides.The NH3-TPD and XPS showed that the introduction of Ce、Fe、Si increased the content of oxygen(O) and Mn4+ on the surface of pure manganese oxides,the doping of Ce and Si increased the total acid content of the catalyst,and Fe effectively regulated the distribution of acid sites.The H2-TPR showed that all the elements except Ce weakened the redox capacity of pure manganese oxide catalyst.The denitrification activity of all catalysts was tested at 100~400 ℃.MnCeO x showed excellent denitrification activity at low temperature and MnSiO x showed good denitrification activity at medium and high temperature.

Key words: NH3-SCR, Mn2O3, Mn5O8

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