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首页> 外文期刊>Fuel >Source of N and O in N_2O formation during selective catalytic reduction of NO with NH_3 over MnO_x/TiO_2
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Source of N and O in N_2O formation during selective catalytic reduction of NO with NH_3 over MnO_x/TiO_2

机译：在MnO_x / TiO_2上用NH_3选择性催化还原NO的过程中N_2O形成中N和O的来源

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摘要

As an undesired detrimental byproduct in selective catalytic reduction of NO with NH3 over MnOx/TiO2 catalysts, N2O has received great concern in recent years. Its formation pathways and probable mechanism, especially the sources of N and O, were explored by the application of contrastive experiments and targeted characterization analysis in the work. Experimental results showed that both NH3 oxidation reactions and non-selective catalytic reduction (NSCR) of NO with NH3 accounted for N2O formation. The source of N in N2O formation was not only from NH3 involved in NH3 oxidation reactions but also from NH3 and NO involved in NSCR reactions of NO with NH3, while the source of O was closely related to O-2 and catalyst oxygen. XPS results confirmed the participation of surface absorbed oxygen in N2O formation during all experiments with different O-2 concentrations, and the participation proportion decreased as introduced O-2 concentrations increased. Only a little lattice oxygen acted as the oxidizer and provided O for N2O formation, and with sufficient O-2 in the reactor, the participation of lattice oxygen seemed negligible. Gaseous O-2 was an important source of O in N2O formation, and its role strengthened with the increase of its concentration.
机译：作为在MnOx / TiO2催化剂上用NH3选择性催化还原NO的有害副产物，N2O近年来引起了人们的极大关注。通过对比实验和目标表征分析，探讨了其形成途径和可能的机理，尤其是氮和氧的来源。实验结果表明，NH3氧化反应和NO与NH3的非选择性催化还原（NSCR）共同构成了N2O的形成。 N2O形成中的N来源不仅来自参与NH3氧化反应的NH3，而且来自参与NO与NH3的NSCR反应的NH3和NO，而O的来源则与O-2和催化剂氧密切相关。 XPS结果证实了在不同O-2浓度的所有实验中，表面吸收的氧参与了N2O的形成，并且随着引入的O-2浓度的增加，参与比例降低。只有很少的晶格氧充当氧化剂并为形成N2O提供O，并且在反应器中有足够的O-2，晶格氧的参与似乎可以忽略不计。气态O-2是N2O形成过程中O的重要来源，其作用随着浓度的增加而增强。

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  • 来源
    《Fuel》 |2019年第1期|23-29|共7页
  • 作者

    Wang Denghui; Yao Qi; Hui Shien; Niu Yanqing;

  • 作者单位

    Xi An Jiao Tong Univ Sch Energy & Power Engn State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    N2O formation; MnOx/TiO2 catalyst; NH3-SCR;

    机译：N2O形成;MnOx / TiO2催化剂;NH3-SCR;

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