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Synthesis of CrOx/C catalysts for low temperature NH3-SCR with enhanced regeneration ability in the presence of SO2

机译：低温NH3-SCR的克罗伯/ C催化剂的合成在SO2存在下具有增强的再生能力

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摘要

Chromium oxide nano-particles with an average diameter of 3 nm covered by amorphous carbon (CrOx/C) were successfully synthesized. The synthesized CrOx/C materials were used for the selective catalytic reduction of NOx by NH3 (NH3-SCR), which shows superb NH3-SCR activity and in particular, satisfactory regeneration ability in the presence of SO2 compared with Mn-based catalysts. The as-prepared catalysts were characterized by XRD, HRTEM, Raman, FTIR, BET, TPD, TPR, XPS and in situ FTIR techniques. The results indicated presence of certain amounts of unstable lattice oxygen exposed on the surface of CrOx nano-particles with an average size of 3 nm in the CrOx/C samples, which led to NO being conveniently oxidized to NO2. The formed NO2 participated in NH3-SCR activity, reacting with catalysts via a "fast NH3-SCR" pathway, which enhanced in NH3-SCR performance of the CrOx/C catalysts. Furthermore, the stable lattice of the CrOx species made the catalyst immune to the sulfation process, which was inferred to be the cause of its superior regeneration ability in the presence of SO2. This study provides a simple way to synthesize stable CrOx nano-particles with active oxygen, and sheds light on designing NH3-SCR catalysts with highly efficient low temperature activity, SO2 tolerance, and regeneration ability.
机译：成功地合成了由非晶碳（Crox / C）覆盖的平均直径为3nm的氧化铬纳米颗粒。合成的Crox / C材料用于NH 3（NH 3-SCR）的NOx选择性催化还原，其显示出SO 2的卓越NH3-SCR活性，特别是与Mn的催化剂相比，在SO2存在下的令人满意的再生能力。通过XRD，HRTEM，拉曼，FTIR，BET，TPD，TPR，XPS和原位FTIR技术以XRD，HRTEM，Raman，FTIR，以及原位FTIR技术的特征在于制备的催化剂。结果表明，在Crox / C样品中平均尺寸为3nm的克罗伯纳米颗粒表面上暴露的一定量的不稳定晶格氧的存在，其不会方便地氧化成NO 2。所形成的NO2参与NH3-SCR活性，通过“快NH3-SCR”途径与催化剂反应，该途径增强了CROX / C催化剂的NH3-SCR性能。此外，克罗峰物种的稳定晶格使催化剂免受硫化过程，这被推断为在SO 2存在下成为其优异再生能力的原因。该研究提供了一种简单的方法来合成具有活性氧的稳定克鲁克纳米颗粒，并在设计NH3-SCR催化剂上的光线脱光，具有高效的低温活性，SO2耐受性和再生能力。

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  • 来源
    《RSC Advances》 |2018年第7期|共11页
  • 作者

    Yu Shuohan; Xu Sheng; Sun Bowen; Lu Yiyang; Li Lulu; Zou Weixin; Wang Peng; Gao Fei; Tang Changjin; Dong Lin;

  • 作者单位

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Coll Engn &

    Appl Sci Collaborat Innovat Ctr Adv Microstruct Nat Lab Solid State Microstruct Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Coll Engn &

    Appl Sci Collaborat Innovat Ctr Adv Microstruct Nat Lab Solid State Microstruct Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

    Nanjing Univ Sch Chem &

    Chem Engn Key Lab Mesoscop Chem MOE Nanjing 210093 Jiangsu Peoples R China;

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