Method for reducing the nitrogen oxide concentration in gases

Details Method for reducing the nitrogen oxide concentration in gases Method for reducing the nitrogen oxide concentration in gases

B - Operations, Transporting

01

D

B01D 53/86 (2006.01)

Patent

CA 2607329

According to the inventive method, a gas containing N2O and NOx is conducted across a series of two catalyst beds, and reducing agent for NOx and N2O is added between the catalyst beds at an amount that causes a predetermined percentage of N2O to be reduced in addition to NOx. The reaction conditions are adjusted such that the N2O concentration of the gas is decomposed by a maximum of 95 percent relative to the N2O concentration at the inlet of the first catalyst bed by being broken down into nitrogen and oxygen while the N2O is chemically reduced in addition to the NOx in the second catalyst bed such that the N2O concentration of the gas is reduced by a minimum of 50 percent relative to the N2O concentration at the inlet of the second catalyst bed.

L'invention concerne un procédé consistant, entre autres, à guider un gaz contenant du N2O et du NOx sur deux lits catalytiques successifs, et à ajouter des agents de réduction pour les composés NOx et N2O entre les lits catalytiques, dans des proportions qui permettent de réduire non seulement le composé NOx mais également une quantité prédéterminée du composé N2O. Les conditions de réaction sont ajustées de manière que, dans le premier lit catalytique, au maximum 95 % de la teneur en N2O du gaz, par rapport à la teneur en N2O à l'entrée du premier lit catalytique, soit décomposé en azote et en oxygène, et de façon que, dans le deuxième lit catalytique, le composé NOx ainsi que le composé N2O subissent une réduction chimique, de sorte que la teneur en N2O du gaz soit réduite d'au moins 50 % par rapport à la teneur en N2O à l'entrée du deuxième lit catalytique.

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