Ammonia oxidation catalyst for the coal fired utilities

Details Ammonia oxidation catalyst for the coal fired utilities Ammonia oxidation catalyst for the coal fired utilities

B - Operations, Transporting

01

D

B01D 53/86 (2006.01) B01J 23/648 (2006.01)

Patent

CA 2599114

A process is described that removes by oxidation the excess ammonia (NH3) gas from flue gases that have been subjected to selective catalytic reduction (SCR) of oxides of nitrogen (NOx) by ammonia injection. The inventive process incorporates a secondary catalyst of precious metal and vanadia on a metal oxide such as titania to catalyze the oxidation of both ammonia and carbon monoxide (CO) while maintaining sulfur dioxide (SO2) levels.

L'invention concerne un procédé permettant d'éliminer par oxydation l'excès d'ammoniac (NH3) de gaz de combustion ayant été soumis à une réduction catalytique sélective (SCR) d'oxydes d'azote (NOx), par l'injection d'ammoniac. Le procédé utilise un catalyseur secondaire comprenant un métal précieux et de l'oxyde de vanadium sur un oxyde métallique, p. ex. oxyde de titane, pour catalyser l'oxydation de l'ammoniac et de l'oxyde de carbone (CO) tout en maintenant les taux de dioxyde de soufre (SO2).

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