Abstract
The activities of Ir-in-CeO 2 (Ir embedded in CeO 2) and Ir-on-CeO 2 (Ir dispersed on the surface of CeO 2) in preferential CO oxidation were comparatively studied in terms of their specific structures with different amount of surface Ir. It was found that the surface exposed Ir sites on Ir-on-CeO 2 were favorable for CO oxidation at low temperature (<100 °C). Encapsulating Ir in CeO 2 inhibited the adsorption of H 2, and also facilitated the activation of surface CeO 2 on Ir-in-CeO 2, which promised a high CO conversion at high temperature (>120 °C). Then a dual bed system with the top Ir-in-CeO 2 and the bottom Ir-on-CeO 2 was developed to widen the temperature window. This dual bed system is unique in affording a high CO conversion in a wide temperature window, from 80 to 200 °C, which is superior to single bed catalyst.
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