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首页> 外文期刊>Fuel >Catalytic oxidation of Hg-0 in flue gas over Ce modified TiO2 supported Co-Mn catalysts: Characterization, the effect of gas composition and co-benefit of NO conversion
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Catalytic oxidation of Hg-0 in flue gas over Ce modified TiO2 supported Co-Mn catalysts: Characterization, the effect of gas composition and co-benefit of NO conversion

机译：Ce修饰的TiO2负载Co-Mn催化剂上烟道气中Hg-0的催化氧化：表征，气体组成的影响和NO转化的协同效益

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摘要

A series of Ce modified TiO2 supported Co-Mn catalysts (CoxMn5/TiCey) prepared by sol-gel method and impregnation method were evaluated for simultaneous catalytic oxidation of Hg-0 and NO in the simulated flue gas. Results showed that the catalysts exhibited good capacity of simultaneous catalytic oxidation of Hg-0 (around 70%) and NO (around 40%) at 300 degrees C using a simulated flue gas (Hg-0, NO, SO2, O-2, H2O and balanced N-2). These catalysts were investigated in detail by means of N-2 adsorption-desorption, XRD, Raman spectroscopy, TEM and XPS. The characterization results indicated that physical characteristics of catalysts were not the main contributor for Hg-0 and NO oxidation. Ce species existed mainly in amorphous phase. The addition of CeOx might lead to a migration of Co and Mn species from bulk to surface. The addition of Co could promote the generation of Mn2O3 but obstruct the dispersion of MnOx on the surface of catalyst. An appropriate increasing loading amount of CoOx or CeOx would be preferable for the improvement of activity performance. The presence of Co3+/Co2+, Mn4+/Mn3+ and Ce4+/Ce3+ redox couples as well as surface oxygen species contributed to the Hg-0 and NO oxidation. A possible synergetic effect Among Co, Mn and Ce species might improve the activity further. Furthermore, an increased oxygen concentration could facilitate the Hg-0 and NO oxidation. NO was observed to promote Hg-0 oxidation with the presence of O-2. SO2 led to a certain decrease of Hg-0 oxidation efficiency due to the competitive adsorption.H2O had a slightly inhibitory impact on Hg-0 oxidation. Moreover, NO oxidation was more susceptible to SO2 than Hg-0 oxidation over the catalyst. (C) 2017 Elsevier Ltd. All rights reserved.
机译：评价了通过溶胶-凝胶法和浸渍法制备的一系列Ce修饰的TiO2负载的Co-Mn催化剂（CoxMn5 / TiCey）在模拟烟气中同时催化Hg-0和NO的氧化。结果表明，使用模拟烟道气（Hg-0，NO，SO2，O-2，Hg-0），催化剂在300摄氏度时具有Hg-0（约70％）和NO（约40％）同时催化氧化的良好能力。 H2O和平衡的N-2）。通过N-2吸附-解吸，XRD，拉曼光谱，TEM和XPS对这些催化剂进行了详细研究。表征结果表明，催化剂的物理特性不是导致Hg-0和NO氧化的主要因素。 Ce物种主要存在于非晶相中。 CeOx的添加可能导致Co和Mn物种从块体迁移到表面。 Co的添加可以促进Mn 2 O 3的生成，但是阻碍了MnO x在催化剂表面上的分散。为了提高活性表现，优选适当增加CoOx或CeOx的负载量。 Co3 + / Co2 +，Mn4 + / Mn3 +和Ce4 + / Ce3 +氧化还原对的存在以及表面氧的存在有助于Hg-0和NO的氧化。 Co，Mn和Ce之间可能的协同作用可能进一步提高活性。此外，增加的氧气浓度可以促进Hg-0和NO的氧化。在O-2的存在下，未观察到NO促进Hg-0氧化。由于竞争性吸附作用，SO2导致Hg-0氧化效率有所降低; H2O对Hg-0氧化有轻微的抑制作用。此外，在催化剂上，NO氧化比Hg-0氧化更易受SO2的影响。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|470-482|共13页
  • 作者

    Li Honghu; Wang Shengkai; Wang Xu; Tang Nian; Pan Siwei; Hu Jiangjun;

  • 作者单位

    Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China;

    Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China;

    Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China;

    Guangdong Power Grid Co, Elect Power Res Inst, Environm Protect Dept, Guangzhou 510080, Guangdong, Peoples R China;

    Guangdong Power Grid Co, Elect Power Res Inst, Environm Protect Dept, Guangzhou 510080, Guangdong, Peoples R China;

    Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, 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

    Ce modified TiO2 supported Co-Mn catalysts; Elemental mercury; NO; Catalytic oxidation;

    机译：Ce修饰的TiO2负载Co-Mn催化剂;元素汞;NO;催化氧化;

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