Gold Nanoparticles Supported
on Carbon Nitride: Influence of Surface Hydroxyls on Low Temperature
Carbon Monoxide Oxidation
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Abstract
This paper reports the synthesis of 2.5 nm gold clusters
on the oxygen free and chemically labile support carbon nitride (C<sub>3</sub>N<sub>4</sub>). Despite having small particle sizes and high
enough water partial pressure these Au/C<sub>3</sub>N<sub>4</sub> 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 C<sub>3</sub>N<sub>4</sub>. 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