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The catalytic decomposition of N 2 O by small rhodium particles (d m = 1.0 to 2.4 nm) supported on various metal oxides was studied in the absence and presence of oxygen in the feed gas and chloride on the catalyst surface. The superior catalytic performance of Rh/MgO and Rh/SiO 2 compared to Rh/CeO 2 , Rh/Al 2 O 3 and Rh/TiO 2 is attributed to relatively large rhodium particles (d m = 2.1 to 2.4 nm). The degree of inhibition caused by oxygen and chloride is found to vary with the acid-base properties of the support materials.

The catalytic abatement of NO over rhodium catalysts supported on carbon nanotubes was studied. In the absence of oxygen, Rh/carbon nanotubes (CNT) catalysts exhibit high activities in the catalytic reduction of NO with the carbon support acting as the reducing agent. The lifetime of the catalysts is limited by the stoichiometric oxidation of the support material.