Compositions and methods for treating exhaust gases

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/94 (2006.01) B01D 53/86 (2006.01) B01J 23/46 (2006.01) F01N 3/20 (2006.01)

Patent

CA 2659740

The present invention provides compositions, systems, and methods for achieving high efficiencies of nitrogen oxide (NOx) removal from exhaust gases while minimizing ammonia slip and sulfur dioxide oxidation. In one embodiment, a method of removing nitrogen oxides from an exhaust gas comprises providing a first catalyst layer, adding an ammonia-containing compound to the exhaust gas upstream of the first catalyst layer in excess of the stoichiometric equivalent of the nitrogen oxides in the exhaust gas, flowing the exhaust gas through the first catalyst layer, selectively catalytically decomposing ammonia in excess of the stoichiometric reaction equivalent of the nitrogen oxides in the exhaust gas, and catalytically reducing the nitrogen oxides by reaction with ammonia not selectively catalytically decomposed.

L'invention porte sur des compositions, systèmes et méthodes d'élimination dans des proportions élevées du NOx de gaz d'échappement tout en réduisant les rejets d'ammoniac et l'oxydation du SO2. Dans une exécution, la méthode d'élimination des oxydes d'azote consiste à: préparer une première couche de catalyseur; ajouter un composés d'ammoniac aux gaz d'échappement en amont de la première couche de catalyseur, excédant l'équivalent stoechiométrique des oxydes d'azote présent dans les gaz d'échappement; faire passer les gaz d'échappement sur la première couche de catalyseur; déposer catalytiquement et sélectivement l'ammoniac excédant l'équivalent de la réaction stoechiométrique des oxydes d'azote présent dans les gaz d'échappement; et réduire catalytiquement les oxydes d'azote par réaction avec l'ammoniac non décomposé catalytiquement et sélectivement.

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