This work investigates 2.5 – 30 nm gold nanoparticles immobilized on Al2O3. It shows that they possess high activity and stability in selective hydrogenation of phenylacetylene into styrene from a phenylacetylene-styrene mixture at 423 K. Strong dependences of the activity and selectivity of Au/ Al2O3 on the gold size were revealed: as the size of supported gold nanoparticles was decreased from 30 to 2.5 nm, the TOF of phenylacetylene hydrogenation increased from 0.028 to 0.142 s−1 and the selectivity of styrene formation increased by an order of magnitude. The nature of the identified dependences is discussed in terms of “Geometric” and “Electronic” size-effect points.

中文翻译：

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苯乙炔在金纳米颗粒上的选择性加氢

这项工作研究了固定在 Al2O3 上的 2.5 – 30 nm 金纳米颗粒。这表明它们在 423 K 从苯乙炔-苯乙烯混合物选择性氢化苯乙炔成苯乙烯方面具有高活性和稳定性。 揭示了 Au/Al2O3 的活性和选择性对金尺寸的强烈依赖性：作为负载金的尺寸纳米颗粒从 30 nm 减少到 2.5 nm，苯乙炔加氢的 TOF 从 0.028 s-1 增加到 0.142 s-1，苯乙烯形成的选择性增加了一个数量级。根据“几何”和“电子”尺寸效应点讨论确定的相关性的性质。