Method for the on-board reactivation of thermally aged...

F - Mech Eng,Light,Heat,Weapons – 01 – N

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F01N 3/08 (2006.01)

Patent

CA 2655922

Nitrogen oxide storage catalysts are used for removal of nitrogen oxides present in the lean exhaust gas of so-called lean-burn engines. Storage catalysts are thermally modified at high temperatures. The modification is a sintering of the catalytically active noble metal components of the catalyst and a formation of compounds of the storage components with the support materials. According to the invention, the formation of compounds of the storage materials can be largely reversed by treatment of the storage material with a gas mixture containing carbon dioxide, optionally steam and optionally nitrogen oxide at temperatures between 200 °C and 950 °C, preferably between 300 °C and 700 °C. The reactivation can be carried out with neutral emissions directly in the vehicle during operation by the adjustment of suitable exhaust conditions and regulating the fuel/air mixture.

Les catalyseurs à accumulation d'oxydes d'azote sont utilisés pour éliminer les oxydes d'azote contenus dans les gaz d'échappement pauvres des moteurs dits pauvres. Les catalyseurs à accumulation vieillissent thermiquement en raison de températures élevées, ce vieillissement étant dû au frittage des composants métaux précieux catalytiquement actifs du catalyseur et à la formation de composés entre les composants accumulateurs et les matériaux supports. Selon l'invention, la formation de composés au niveau des matériaux accumulateurs peut être largement annulée en traitant le matériau accumulateur avec un mélange gazeux contenant du dioxyde de carbone, éventuellement de la vapeur d'eau et éventuellement des oxydes d'azote, à des températures comprises entre 200 °C et 950 °C, de préférence entre 300 °C et 700 °C. La réactivation peut être réalisée avec un bilan d'émissions neutre directement dans le véhicule pendant la marche, par réglage de conditions d'échappement appropriées et régulation du rapport air/carburant.

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