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Sodium Rivals Silver as Single-Atom Active Centers for Catalyzing Abatement of Formaldehyde

机译：钠竞争对手银作为催化消除甲醛的单原子活性中心

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摘要

The development of efficient alkali-based catalysts for the abatement of formaldehyde (HCHO), a ubiquitous air pollutant, is economically desirable. Here we comparatively study the catalytic performance of two single-atom catalysts, Na_1/HMO and Ag_1/ HMO (HMO = Hollandite manganese oxide), in the complete oxidation of HCHO at low temperatures, in which the products are only CO_2 and H_2O. These catalysts are synthesized by anchoring single sodium ions or silver atoms on HMO(001) surfaces. Synchrotron X-ray diffraction patterns with structural refinement together with transmission electron microscopy images demonstrate that single sodium ions on the HMO(001) surfaces of Na_1/HMO have the same local structures as silver atoms of Ag_1/HMO. Catalytic tests reveal that Na_1/HMO has higher catalytic activity in low-temperature oxidation of HCHO than Ag_1/HMO. X-ray photoelectron spectra and soft X-ray absorption spectra show that the surface lattice oxygen of Na_1/HMO has a higher electronic density than that of Ag_1/HMO, which is responsible for its higher catalytic efficiency in the oxidation of HCHO. This work could assist the rational design of cheap alkali metal catalysts for controlling the emissions of volatile organic compounds such as HCHO.
机译：在经济上需要开发用于消除甲醛（HCHO）（一种普遍存在的空气污染物）的高效碱基催化剂。在这里，我们比较研究了两种单原子催化剂Na_1 / HMO和Ag_1 / HMO（HMO =锰铁矿型锰氧化物）在低温下完全氧化HCHO时的催化性能，其中产物仅为CO_2和H_2O。这些催化剂是通过将单个钠离子或银原子固定在HMO（001）表面上而合成的。具有同步结构的同步加速器X射线衍射图以及透射电子显微镜图像表明，Na_1 / HMO的HMO（001）表面上的单个钠离子具有与Ag_1 / HMO的银原子相同的局部结构。催化测试表明，Na_1 / HMO在低温氧化HCHO中比Ag_1 / HMO具有更高的催化活性。 X射线光电子能谱和软X射线吸收光谱表明，Na_1 / HMO的表面晶格氧具有比Ag_1 / HMO更高的电子密度，这是由于其在HCHO的氧化中具有较高的催化效率。这项工作可以帮助合理设计廉价的碱金属催化剂，以控制挥发性有机化合物（如HCHO）的排放。

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  • 来源
    《Environmental Science & Technology》 |2017年第12期|7084-7090|共7页
  • 作者

    Yaxin Chen; Jiayi Gao; Zhiwei Huang; Meijuan Zhou; Junxiao Chen; Chao Li; Zhen Ma; Jianmin Chen; Xingfu Tang;

  • 作者单位

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China;

    Institute of Atmospheric Sciences, Shanghai Key Laboratory of Atmospheric Particle Pollution & Prevention (LAP~3), Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China,Jiangsu Collaborative Innovation Center of Atmospheric Environment & Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 210044, 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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