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首页> 外文期刊>Environmental Science & Technology >Role of Structural Defects in MnO_x Promoted by Ag Doping in the Catalytic Combustion of Volatile Organic Compounds and Ambient Decomposition of O_3
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Role of Structural Defects in MnO_x Promoted by Ag Doping in the Catalytic Combustion of Volatile Organic Compounds and Ambient Decomposition of O_3

机译：Ag掺杂促进MnO_x结构缺陷在挥发性有机化合物催化燃烧和O_3环境分解中的作用

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摘要

Manganese oxides are prominent candidates for the catalytic oxidation of volatile organic compounds (VOCs) or ambient decomposition of O-3 individually. Here, we compared various preparation methods to create a defect-enriched Ag-MnOx nanocomposite that exhibits a remarkably multifunctional activity in VOC combustion and ozone decomposition. Ag+ ions were well-dispersed in the microtunnels of Ag-MnOx-H via hydrothermal replacement of the original K+ ions; this catalyst's benzene combustion efficiency (T-90% = 216 degrees C at a space velocity of 90 000 mL h(-1) g(-1)) was comparable to that of typical noble metal catalysts. Moreover, the decomposition of ozone over the Ag-MnOx-H catalyst (space velocity = 840 000 mL h(-1) g(-1)) under a relative humidity of 60% was above 90%, indicating that it is a promising material for ozone elimination in practical application. The local structure results indicated that silver incorporation via the hydrothermal method facilitates the formation of nonstoichiometric defects in the MnOx matrix. The large number of active oxygen species related to O vacancies appeared to play critical roles in VOC combustion; moreover, the oxygen vacancies originating from O defects were also critical in O-3 abatement. This work provides multifunctional catalysts for VOC combustion and ambient O-3 decomposition and may assist with the rational design of MnOx catalysts for application in various conditions.
机译：锰氧化物是挥发性有机化合物（VOC）催化氧化或O-3在环境中单独分解的重要候选物。在这里，我们比较了各种制备方法，以创建一种富含缺陷的Ag-MnOx纳米复合材料，该复合材料在VOC燃烧和臭氧分解中表现出显着的多功能活性。通过水热置换原始的K +离子，将Ag +离子很好地分散在Ag-MnOx-H的微隧道中。该催化剂的苯燃烧效率（在90000 mL h（-1）g（-1）的空速下，T-90％= 216摄氏度）可与典型的贵金属催化剂相比。而且，在相对湿度为60％的条件下，Ag-MnOx-H催化剂（空速= 840 000 mL h（-1）g（-1））上的臭氧分解率达到90％以上，这是有希望的在实际应用中用于消除臭氧的材料。局部结构结果表明，通过水热法引入的银促进了MnOx基体中非化学计量缺陷的形成。与O空位有关的大量活性氧似乎在VOC燃烧中起着关键作用。此外，由O缺陷引起的氧空位在减少O-3中也很关键。这项工作为VOC燃烧和环境O-3分解提供了多功能催化剂，并可能有助于MnOx催化剂在各种条件下的合理设计。

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  • 来源
    《Environmental Science & Technology》 |2019年第18期|10871-10879|共9页
  • 作者

    Deng Hua; Kang Shunyu; Ma Jinzhu; Wang Lian; Zhang Changbin; He Hong;

  • 作者单位

    Chinese Acad Sci Inst Urban Environm Ctr Excellence Reg Atmospher Environm Key Lab Urban Pollutant Convers Xiamen 361021 Fujian Peoples R China;

    Chinese Acad Sci Inst Urban Environm Ctr Excellence Reg Atmospher Environm Key Lab Urban Pollutant Convers Xiamen 361021 Fujian Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Urban Environm Ctr Excellence Reg Atmospher Environm Key Lab Urban Pollutant Convers Xiamen 361021 Fujian Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Joint Lab Environm Simulat & Pollut Con Beijing 100085 Peoples R China;

    Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Joint Lab Environm Simulat & Pollut Con Beijing 100085 Peoples R China;

    Univ Chinese Acad Sci Beijing 100049 Peoples R China|Chinese Acad Sci Res Ctr Ecoenvironm Sci State Key Joint Lab Environm Simulat & Pollut Con Beijing 100085 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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