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首页> 外文期刊>Applied Surface Science >The decomposition of mixed oxide Ag2Cu2O3: Structural features and the catalytic properties in CO and C2H4 oxidation
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The decomposition of mixed oxide Ag2Cu2O3: Structural features and the catalytic properties in CO and C2H4 oxidation

机译：混合氧化物Ag2Cu2O3的分解：CO和C2H4氧化的结构特征和催化性能

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摘要

The mixed silver-copper oxide Ag2Cu2O3 with a paramelaconite crystal structure is a promising material for catalytic applications. The as-prepared sample of Ag2Cu2O3 consisted of brick-like particles extended along the [001] direction. A combination of physicochemical techniques such as TEM, XPS and XRD was applied to investigate the structural features of this mixed silver-copper oxide. The thermal stability of Ag2Cu2O3 was investigated using in situ XRD under different reaction conditions, including a catalytic CO + O-2 mixture. The first step of Ag2Cu2O3 decomposition was accompanied by the appearance of ensembles consisting of silver nanoparticles with sizes of 5-15 nm. Silver nanoparticles were strongly oriented to each other and to the surface of the initial Ag2Cu2O3 bricks. Based on the XRD data, it was shown that the release of silver occurred along the a and b axes of the paramelaconite structure. Partial decomposition of Ag2Cu2O3 accompanied by the formation of silver nanoparticles was observed during prolonged air storage under ambient conditions. The high reactivity is discussed as a reason for spontaneous decomposition during Ag2Cu2O3 storage. The full decomposition of the mixed oxide into metallic silver and copper (II) oxide took place at temperatures higher than 300 degrees C regardless of the nature of the reaction medium (helium, air, CO + O-2). Catalytic properties of partially and fully decomposed samples of mixed silver-copper oxide were measured in low-temperature CO oxidation and C2H4 epoxidation reactions. (C) 2017 Elsevier B.V. All rights reserved.
机译：具有准黑铁矿晶体结构的混合银-铜氧化物Ag2Cu2O3是用于催化应用的有前途的材料。制备的Ag2Cu2O3样品由沿[001]方向延伸的砖状颗粒组成。结合物理化学技术（如TEM，XPS和XRD）研究了这种混合的银铜氧化物的结构特征。使用原位XRD在不同的反应条件下，包括催化的CO + O-2混合物，研究了Ag2Cu2O3的热稳定性。 Ag2Cu2O3分解的第一步是出现由大小为5-15 nm的银纳米颗粒组成的集合体。银纳米颗粒彼此之间以及最初的Ag2Cu2O3砖的表面都具有强烈的取向。基于XRD数据，表明银的释放沿副黑云母结构的a和b轴发生。在环境条件下长时间空气存储期间，观察到Ag2Cu2O3的部分分解以及银纳米颗粒的形成。讨论了高反应性是Ag2Cu2O3储存过程中自发分解的原因。无论反应介质（氦气，空气，CO + O-2）的性质如何，混合氧化物在高于300摄氏度的温度下完全分解为金属银和铜（II）氧化物。在低温CO氧化和C2H4环氧化反应中测量了部分和完全分解的混合银铜氧化物样品的催化性能。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2018年第ptaa期|363-374|共12页
  • 作者

    Svintsitskiy Dmitry A.; Kardash Tatyana Yu.; Slavinskaya Elena M.; Stonkus Olga A.; Koscheev Sergei V.; Boronin Andrei I.;

  • 作者单位

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

    Boreskov Inst Catalysis, Pr Lavrentieva 5, Novosibirsk 630090, Russia|Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia;

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  • 关键词

    Paramelaconite; Mixed silver-copper oxide; Silver nanoparticles; Oriented growth; CO oxidation; Ethylene epoxidation;

    机译：副黑云母;混合银铜氧化物;银纳米粒子;定向生长;CO氧化;乙烯环氧化;

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