Abstract
A treatment with H2 at 800°C followed by mild reoxidation (<300°C) increases the low temperature (<200°C) steady-state activity in the reduction of NO by propene in the presence of O2 of a Pt(1.5%)/(ZrO2–CeO2 on Al2O3) catalyst. The effect is not present for a lower temperature treatment with H2 or for reoxidation above 300°C. Transient reactivity tests together with characterization data (H2-TPR, O2 uptake, H2 chemisorption) indicate that the high temperature reduction modifies the characteristics of ceria–zirconia and induced metal–support interaction effects, both responsible of the enhanced catalytic activity at low temperature.
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