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首页> 外文期刊>Environmental Science & Technology >Exceptional Activity over the Submonolayer MoO_3 Motif on TiO_2 for Nitrogen Oxide Emission Abatement
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Exceptional Activity over the Submonolayer MoO_3 Motif on TiO_2 for Nitrogen Oxide Emission Abatement

机译：用于氮氧化物排放释放的TiO_2上的子组醇层MOO_3主题的特殊活动

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摘要

Surface restructuring is a useful approach to modulating the properties of nanoparticles. A low-dimensional atomic-thickness active species may exhibit remarkably enhanced activity, in contrast to the inert nature of its bulk counterparts. Here, we report a procedure for growing in situ a low-dimensional monolayer-thick MoO3 entity from its bulk precursor. Traditional analysis of NO abatement catalyzed by vanadium-based materials implicates vanadium as the active site enhanced by the promoter element W or Mo. However, we report here that the atomic thickness MoO3 film can function alone as an efficient NO abatement catalyst by itself; to achieve comparable performance with the industrial catalysts, it is not necessary to add vanadium oxide, which often has serious toxicity issues associated with it. We find that submonolayer MoO3 is responsible for the observed high activity. Electron microscopy and Raman spectroscopy reveal that the monolayer-thick MoO3 surface phase is directly attached to the anatase TiO2 support. The ab initio quantum calculations predict that the bidimensional MoO3 surface phase would provide more electron back-donation to the antibonding orbital of reactants and thus more efficient reactant activation. The spectral evolution of in situ DRIFTS indicates that the redox mechanism over the low-dimensional MoO3/TiO2 involves both Bronsted and Lewis acid sites during the reaction cycle.
机译：表面重组是调节纳米颗粒性质的有用方法。与其散装对应物的惰性性质相比，低尺寸原子厚度活性物质可能表现出显着增强的活性。在这里，我们报告了一种从其散装前体造成低维单层厚的MOO3实体的过程。钒基材料催化的NO减轻的传统分析将钒作为由启动子元素W或MO增强的活性位点来含有钒。然而，我们在此报告原子厚MOO3膜可以单独用作自身的有效的不缓解催化剂;为了实现与工业催化剂的可比性，不需要添加氧化钒，这通常具有与其相关的严重毒性问题。我们发现亚诺丹制作MOO3负责观察到的高活动。电子显微镜和拉曼光谱表明，单层厚的MOO3表面相直接连接到锐钛矿TiO 2载体上。 AB InitiO量子计算预测，Bidimensional MOO3表面相将为反应物的抗抗体的抗体提供更多的电子退回，从而提供更有效的反应物活化。原位漂移的光谱演化表明，低维MOO3 / TiO2上的氧化还原机制涉及在反应循环期间的布朗斯特和路易斯酸存在。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|5309-5318|共10页
  • 作者

    Huang Zhiwei; Du Yueyao; Zhang Jie; Wu Xiaomin; Shen Huazhen; Jing Guohua;

  • 作者单位

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R China;

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R China;

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R China;

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R China;

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R China;

    Huaqiao Univ Coll Chem Engn Dept Environm Sci & Engn Xiamen 361021 Fujian Peoples R 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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