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Mn/SAPO-34 as an efficient catalyst for the low-temperature selective catalytic reduction of NOx with NH3

机译：Mn / SAPO-34作为NH3低温选择性催化还原NOx的有效催化剂

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摘要

A series of Mn-exchanged SAPO-34 catalysts were synthesized and developed as catalysts for the low temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. 4Mn/SAPO-34 showed the highest SCR activity in the temperature range of 120-210 degrees C. The microstructure of zeolite supports, acidity, manganese species and reaction mechanism were investigated in detail by BET, NH3-TPD, UV-Vis, H-2-TPR, XPS and in situ DRIFTS. Mn3+ and Mn4+ related species were proved to be the active sites for the SCR reaction. The Eley-Rideal mechanism was proved to be effective on 4Mn/SAPO-34 for the low temperature SCR reaction in which coordinated NH4+ species react with gas-phase NO to form an activated transition state and subsequently decomposed to N-2 and H2O.
机译：合成了一系列MN交换的SAPO-34催化剂，并作为催化剂的催化剂而发展为低温选择性催化还原（SCR），在过量氧气存在下氨。 4Mn / SAPO-34显示了120-210℃的温度范围内的最高SCR活性。通过BET，NH3-TPD，UV-Vis，H详细研究了沸石载体，酸度，锰物种和反应机理的微观结构 -2-TPR，XPS和原位漂移。 证明Mn3 +和Mn4 +相关物种是SCR反应的活性位点。 ELEY - rideal机理被证明在4mN / sapo-34上有效，用于低温SCR反应，其中COORD NH 4 +物种与气相NO反应以形成活化的过渡状态并随后分解为N-2和H2O。

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  • 来源
    《RSC Advances》 |2017年第51期|共9页
  • 作者

    Pang Chengkai; Zhuo Yuqun; Weng Qiyu;

  • 作者单位

    Tsinghua Univ Dept Thermal Engn Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

    Tsinghua Univ Dept Thermal Engn Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

    Tsinghua Univ Dept Thermal Engn Beijing Engn Res Ctr Ecol Restorat &

    Carbon Fixat Key Lab Thermal Sci &

    Power Engn Minist Educ Beijing 100084 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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