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首页> 外文期刊>Chemistry: A European journal >Structure Evolution and Associated Catalytic Properties of PtSn Bimetallic Nanoparticles
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Structure Evolution and Associated Catalytic Properties of PtSn Bimetallic Nanoparticles

机译：PtSn双金属纳米粒子的结构演变及相关的催化性能

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摘要

Bimetallic nanoparticles (NPs) often show new catalytic properties that are different from those of the parent metals. Carefully exploring the structures of bimetallic NPs is a prerequisite for understanding the structure-associated properties. Herein, binary PtSn NPs with tunable composition are prepared in a controllable manner. X-ray characterizations reveal that their structures evolve from SnO2-x-patched PtSn alloys to SnO2-x-patched Pt clusters when more tin is incorporated. An obvious composition-dependent catalytic performance is observed for the hydrogenation of ,-unsaturated aldehydes: the selectivity to unsaturated alcohol increases substantially at high tin content, whereas the reaction rate follows a volcano shape. Furthermore, Pt sites are responsible for hydrogen dissociation, whereas oxygen vacancy (O-vac) sites, provided by SnO2-x, drastically enhance the adsorption of carbonyl group.
机译：双金属纳米颗粒（NPs）通常显示出不同于母体金属的新催化性能。仔细探索双金属NP的结构是了解与结构相关的特性的先决条件。在此，以可控制的方式制备具有可调组成的二元PtSn NP。 X射线表征显示，当掺入更多锡时，其结构从贴有SnO2-x的PtSn合金演变为贴有SnO2-x的Pt簇。对于不饱和醛的氢化，观察到明显的依赖组分的催化性能：在高锡含量下，对不饱和醇的选择性显着增加，而反应速率遵循火山的形状。此外，Pt位点负责氢的解离，而SnO2-x提供的氧空位（O-vac）位点则大大增强了羰基的吸附。

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