Abstract
The effect of high-temperature ageing on the activity of Rh/CeO 2 –ZrO 2 for the NO–C 3 H 6 –O 2 reaction was quite different depending on the Ce/Zr molar ratio of CeO 2 –ZrO 2 support. The activity of Rh/CeO 2 –ZrO 2 with a Ce/Zr molar ratio of 74/26 (Rh/CZ-74/26) was significantly enhanced by high-temperature ageing, whereas that of the other Rh/CeO 2 –ZrO 2 was decreased. The promotion of the activity of Rh/CZ-74/26 by high-temperature ageing was considered to be due to the formation and stabilization of active reduced Rh species as well as the change in the surface properties of CeO 2 –ZrO 2 to inhibit the formation of formate species poisoning the catalytically active sites.
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