Gold Nanoparticles Supported on Carbon Nitride: Influence of Surface Hydroxyls on Low Temperature Carbon Monoxide Oxidation
Gold Nanoparticles Supported on Carbon Nitride: Influence of Surface Hydroxyls on Low Temperature Carbon Monoxide Oxidation
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DOI：
10.1021/cs3001094
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发表时间：
2012-05
期刊：
影响因子：
12.9
通讯作者：
Joseph A. Singh;S. Overbury;N. Dudney;Mei-xia Li;G. Veith
中科院分区：
文献类型：
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作者：
Joseph A. Singh;S. Overbury;N. Dudney;Mei-xia Li;G. Veith
本文报道了在无氧和化学不稳定的氮化碳载体（C3N4）上合成2.5 nm金簇的方法。尽管这些Au/C3N4催化剂具有较小的颗粒尺寸和足够高的水分压，但它们对一氧化碳的气相和液相氧化不起作用。缺乏活性的原因是由于C3N4表面缺乏−OH基团。这些OH基团被认为是CO氧化过程中CO活化的原因。碱性- OH基团的重要性解释了支持等电点对催化活性的依赖性。
This paper reports the synthesis of 2.5 nm gold clusters on the oxygen free and chemically labile support carbon nitride (C3N4). Despite having small particle sizes and high enough water partial pressure these Au/C3N4 catalysts are inactive for the gas phase and liquid phase oxidation of carbon monoxide. The reason for the lack of activity is attributed to the lack of surface −OH groups on the C3N4. These OH groups are argued to be responsible for the activation of CO in the oxidation of CO. The importance of basic −OH groups explains the well documented dependence of support isoelectric point versus catalytic activity.