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首页> 外文期刊>Environmental Science & Technology >Titania-Samarium-Manganese Composite Oxide for the Low-Temperature Selective Catalytic Reduction of NO with NH_3
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Titania-Samarium-Manganese Composite Oxide for the Low-Temperature Selective Catalytic Reduction of NO with NH_3

机译：二氧化钛-mar-锰复合氧化物用于NH_3的低温选择性催化还原NO

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摘要

A novel Ti-doped Sm-Mn mixed oxide (TiSmMnO_x) was first designed for the selective catalytic reduction (SCR) of NO_x with NH_3 at a low temperature. The TiSmMnO_x catalyst exhibited a superior catalytic performance, in which NO_x conversion higher than 80% and N_2 selectivity above 90% could be achieved in a wide-operating temperature window (60-225℃). Specially, the catalyst also showed high durability against the large space velocity and excellent SO_2/H_2O resistance. Ti incorporation can efficiently inhibit MnO_x crystallization and tune the MnO_x phase during calcination at a high temperature. Subsequently, a high specific surface area as well as an increased amount of acid sites on the TiSmMnO_x catalysts were produced. Further, the reducibility of the Sm-doped MnO_x catalyst was modulated, facilitating NO oxidation and inhibiting NH_3 nonselective oxidation. Consequently, a superior SCR activity was achieved at a low temperature and the operating temperature window of the TiSmMnO_x catalyst was significantly widened. These findings may provide new insights into the reasonable design and development of the new non-vanadium catalysts with a high NH_3-SCR activity for industrial application.
机译：首先设计了一种新型的Ti掺杂Sm-Mn混合氧化物（TiSmMnO_x），用于在低温下用NH_3选择性催化还原NO_x。 TiSmMnO_x催化剂表现出优异的催化性能，在较宽的工作温度范围（60-225℃）下，NO_x转化率可达到80％以上，N_2选择性可达到90％以上。特别地，该催化剂还显示出对大空速的高耐久性和优异的抗SO_2 / H_2O性能。掺入Ti可以有效地抑制MnO_x的结晶并在高温煅烧期间调节MnO_x相。随后，在TiSmMnO_x催化剂上产生了高的比表面积以及增加的酸位。此外，调节了掺杂Sm的MnO_x催化剂的还原性，从而促进了NO的氧化并抑制了NH_3的非选择性氧化。因此，在低温下获得了优异的SCR活性，并且TiSmMnO_x催化剂的工作温度窗口显着加宽。这些发现可能为工业应用中具有较高NH_3-SCR活性的新型非钒催化剂的合理设计和开发提供新的见解。

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  • 来源
    《Environmental Science & Technology》 |2020年第4期|2530-2538|共9页
  • 作者

    Qian Xu; Zhilin Fang; Yiyuan Chen; Yanglong Guo; Yun Guo; Li Wang; Yunsong Wang; Jinshui Zhang; Wangcheng Zhan;

  • 作者单位

    Key Laboratory for Advanced Materials and Research Institute of Industrial Catalysis School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 P. R. China;

    State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou 350108 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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