Abstract
Abstract Gold catalysts (∼1%) supported on CeO 2 , on CeO 2 modified by inclusion of lanthanum (10%) or iron (5%), and on CeZrO 4 , have been prepared, characterised (N 2 physisorption, XRD) and tested for CO oxidation (200–300 K); stability tests for up to 75 h (Salford) and 24 h (Delft) have also been conducted. All three ‘modified’ catalysts show 10–20% conversion at ∼200–243 K, but lanthanum and zirconium modifiers lead to slightly decreased activity at 243–293 K. Au/La-CeO 2 and Au/Fe-CeO 2 in particular, however, show exceptional stability in life-tests at ambient temperature. DRIFTS results on fresh and used catalysts suggest that this may be due to both better retention of surface hydroxide groups and lesser formation of carbonate/bicarbonate ions near gold particles during reaction. Mechanisms to account for this behaviour are considered and hydroxyl groups acting catalytically may be responsible for stable activity.
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