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The activity of Rh/CeO 2 for NO reduction by C 3 H 6 was gradually deceased by mixing with ZrO 2 until 68 mol%. Rh supported on CeO 2 -ZrO 2 with higher OSC was found to show lower catalytic activity. High OSC of CeO 2 -ZrO 2 would probably stabilize the surface of Rh in oxidized state, resulting in low activity and low efficiency of C 3 H 6 utilization for NO reduction. In situ FT-IR spectroscopy suggested that mononitrosyl species such as Rh(NO) d-and Rh(NO) d? are reaction intermediates in the NO-C 3 H 6 -O 2 reaction over Rh/CeO 2 -ZrO 2 catalysts.

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Transition metal-mesoporous silica hybrids were prepared by complexation or ion exchange processes using Cr, Mn, Fe, Co, Ni and Cu nitrate or chloride salts. XRD measurement confirmed that Co and Ni metal crystallites in the hybrids were several nanometers in size. The size implies that the crystallites were formed within mesopores of mesoporous silica. The amount of transition metal in the hybrids prepared by complexation was larger than those by ion-exchange process. The hybrids have been examined for O2 and H2 adsorption at 298 K, and the hybrid including Ni metal has an ability to adsorb larger amount of H2 than others.