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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Size and Catalytic Activity of Supported Gold Nanoparticles: An in Operando Study during CO Oxidation
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Size and Catalytic Activity of Supported Gold Nanoparticles: An in Operando Study during CO Oxidation

机译：负载金纳米粒子的大小和催化活性：在CO氧化过程中的一项研究。

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摘要

The origin of the catalytic activity of gold nanoparticles remains debated despite extensive studies. This in operando work investigates the relationship between catalytic activity and size/shape of gold nanoparticles supported on TiO2(HO) during CO oxidation. The nanoparticles were synthesized by vapor deposition in ultrahigh vacuum. Their geometry was monitored in the presence of O2, Ar, or a mixture of O2 + CO and of Ar + CO by grazing incidence small-angle X-ray scattering simultaneously with the catalytic activity. The occurrence of CO oxidation induces a sintering directly correlated to the reaction rate. The catalytic activity is optimum for a nanoparticle's diameter of 2.1 ± 0.3 nm and a height of about six atomic layers. Below this size, the activity drop corresponds to a height decrease. Rescaling of activities obtained in different experimental conditions shows consistency of these results with published data using both "model" and "real" catalysts.
机译：尽管进行了广泛的研究，但金纳米颗粒的催化活性的起源仍存在争议。该工作研究了CO氧化过程中催化活性与负载在TiO2（HO）上的金纳米颗粒的大小/形状之间的关系。通过在超高真空下气相沉积来合成纳米颗粒。通过掠入射小角度X射线散射和催化活性，在O2，Ar或O2 + CO和Ar + CO的混合物存在下监测其几何形状。 CO氧化的发生引起与反应速率直接相关的烧结。对于直径为2.1±0.3 nm的纳米颗粒和大约六个原子层的高度，催化活性是最佳的。低于此大小，活动性下降对应于高度下降。在不同实验条件下获得的活性的重新标度显示了使用“模型”和“真实”催化剂的结果与已公布数据的一致性。

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