Patent ID: 7591987
Filing Date: 2009-09-22
Classification: B01D,B01J

Abstract:
1. In a method for treating an NH 3 -containing gas wherein a gas containing an ammonia (NH 3 ) of a high concentration is allowed to pass through a pre-treatment catalyst layer having a function for oxidizing NH 3 to generate nitrogen monoxide (NO), and then pass through a denitration catalyst layer having in combination, a denitration function and a function for oxidizing NH 3 to generate NO, which contains titanium oxide (TiO 2 ); an oxide of at least one selected from the group consisting of vanadium (V), tungsten (W), molybdenum (Mo), zeolite, titania, alumina, and zirconia supported with platinum (Pt), and combinations thereof; a method for preventing thermal deterioration of the catalyst of the denitration catalyst layer, characterized by disposing a catalyst layer not having the function for oxidizing NH 3 to generate NO in the pre-treatment catalyst layer in parallel thereto.