Removing CO from hydrogen streams is an important industrial process. The catalytic preferential oxidation of CO (PrOx) is a promising method for CO removal, leaving the hydrogen concentration unchanged. Here, the effect of size and support on the gold‐catalyzed PrOx reaction using size‐controlled Au nanocrystals (NCs) is investigated. For all supports, Au NC sizes of 2–5 nm show the highest rates, whereas for larger sizes rates drop. Ceria‐supported Au shows by far the best performance. By analyzing the dependency of the reaction rate on the NC diameter, the most active centers for CO oxidation on Au/CeO₂ are Au⁺ corner atoms at the interface with the support, resulting in 2.1 nm Au NCs supported on ceria reaching full O₂ conversion and CO selectivity of about 50%. Therefore, it is suggested that increasing the fraction of Au‐ceria interface sites would lead to the best performing materials for this reaction. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3159–3167, 2018

中文翻译：

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使用尺寸受控的金纳米晶催化剂了解一氧化碳（PrOx）的优先氧化

从氢气流中去除一氧化碳是重要的工业过程。CO（PrOx）的催化优先氧化是去除CO的有前途的方法，而氢的浓度保持不变。在这里，研究了尺寸和载体对使用尺寸受控的金纳米晶体（NC）的金催化的PrOx反应的影响。对于所有支持物，2-5 nm的Au NC尺寸显示出最高的比率，而对于较大的尺寸，比率下降。到目前为止，由Ceria支持的Au表现出最好的性能。通过分析反应速率对NC直径的依赖性，Au / CeO ₂上CO氧化最活跃的中心是与载体界面处的Au ⁺角原子，从而使铈土上负载的2.1 nm Au NCs达到了全O _2。转化率和CO选择性约为50％。因此，建议增加二氧化铈界面位点的比例将导致该反应的最佳材料。©2018美国化学工程师学会AIChE J，64：3159-3167，2018