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Reduction of NO by hydrocarbons in an oxidizing atmosphere is an attractive way to substitute the traditional NOx abatement technology from a viewpoint of practical application to the deNOx systems of diesel and lean-burn gasoline engine exhausts[1～3]. In this study, a series of novel catalysts Sn1 - xZrxO2 solid solutions were prepared by substituting some of the Sn4 + ions in a cassiterite lattice with Zr4+ ions.These solid solutions performed significantly higher activity than pure SnO2 presented on the selective reduction of NO with propene in the poresence of O2.