Procedure for the nitrogen removal predominantly of combustion engines lean claimant by exhaust gase

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Removing nitrogen oxides from IC engine exhaust gases comprises placing a catalytic solid for storing nitrogen oxides and containing rhodium applied to a porous support in the exhaust gas pipe of the engine; storing the nitrogen oxides during the lean operating phase having an air ratio lambda of more than 1; and releasing and catalytically converting the nitrogen oxides during the rich operating phase having an air ratio lambda of less than 1. The porous support consists of at least 50 wt.% zirconium oxide, titanium oxide, silicon oxide and/or a zeolite. The catalytic solid is free from alkaline earth metals, alkali metals or rare earths.