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Shape-dependent catalytic activity of palladium nanocrystals for the oxidation of carbon monoxide

机译：钯纳米晶体的形状依赖性催化活性，用于一氧化碳的氧化

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摘要

It is of great interest to study the shape effect on the catalytic activity of metal nanocrystals, which exposed different crystallographic facets upon adopting various shapes. The investigations on shape-dependent catalysis of supported metal nanocrystals need to be conducted over nanocrystals with well-defined shapes and cleaned surface. The palladium nanocrystals with cubic, octahedral, and spherical morphologies were synthesized and well dispersed onto the inert silica support after removing the capping agents, which were used as the heterogeneous catalysts for carbon monoxide (CO) oxidation. It was found that the crystal facets of Pd nanoparticles played an essential role in determining the catalytic oxidation properties. As a result, the octahedral and spherical nanoparticles that predominantly exposed the Pd {111} crystal facets exhibited significantly better catalytic activity than the palladium nanocubes that possessed the Pd {100} crystal facets as the basal plane for the CO catalytic oxidation. It was inferred that the appropriate adsorption strength of CO molecules on Pd {111} planes was beneficial to the enhancement of the catalytic activity.
机译：研究形状对金属纳米晶体的催化活性的影响非常有趣，金属纳米晶体的催化活性在采用各种形状时暴露了不同的晶体学面。需要在具有明确定义的形状和清洁表面的纳米晶体上进行对形状依赖性催化的形状依赖性催化。除去上限剂后，合成了具有立方，八面体和球形形态的钯纳米晶体，并将其很好地分散在惰性二氧化硅载体上，这些封闭剂被用作一氧化碳（CO）氧​​化的异质催化剂。发现PD纳米颗粒的晶体方面在确定催化氧化特性中起着至关重要的作用。结果，主要暴露于Pd {111}晶体面的八面体和球形纳米颗粒表现出明显更好的催化活性，其催化活性明显好于具有PD {100}晶体面的钯纳米纤维作为基础平面作为基础平面的催化氧化。据推断，CO分子在PD {111}平面上的适当吸附强度对增强催化活性是有益的。

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