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The catalytic decomposition of H 2 O 2  on differently pre-treated Au/CeO 2  catalyst was studied by kinetic measurements at 20-50 °C. The prepared catalyst was subjected to pre-treatment by heating either in oxidative (10% O 2 /N 2 ) or inert (pure N 2 )atmosphere at 400 °C. The different oxidation states of gold were determined by X-ray photoelectron spectroscopy measurements. The Au/CeO 2  catalyst exhibited an excellent catalytic activity towards H 2 O 2  decomposition. The catalytic activity of oxygen pre-treated sample was about twice higher than that measured for nitrogen pre-treated sample. This finding ran parallel to the amount of Au n+  as determined by XPS, indicating the role played by Au n+  species as the most active catalyst’s constituent. However, one cannot overlook the role of metallic gold in catalyzing the H 2 O 2,  decomposition showing small activity compared to that of cationic gold. The average crystallites size of metallic gold particles was found to be 7±0.5 nm independent of the pre-treatment conditions. The apparent activation energy of the catalyzed reaction was found to be 46.5 and 47.8 kJ/mol for oxygen and nitrogen pre-treatment, respectively.

Catalytic activity of nanosized Au/CeO2 catalyst towards H2O2 decomposition and the role of cationic/metallic ratio in its activity