Catalyst system for removing nitrogen oxide and method for removing nitrogen oxide

Abstract

Provided in a catalyst system are: a first reaction part fitted with a first catalyst containing, as active constituents, at least, a complex oxide consisting of two or more oxides selected from among silica, alumina, titania, zirconia, and tungsten oxide, and a rare earth metal or transition metal (except Cu, Co, Ni, Mn, Cr, and V); and a second reaction part fitted with a second catalyst containing, as active constituents, at least, a noble metal and a silica-alumina type complex oxide.

Description

[0001] Cross References to Related Applications [0002] This application claims priority based on Japanese Patent Application No. 2004-55351 filed on February 27, 2004, which is incorporated herein by reference. technical field [0003] The present application relates to a nitrogen oxide removal catalyst system and a nitrogen oxide removal method. Background technique [0004] In order to remove (eliminate) nitrogen oxides, a technique of reducing and denitrating nitrogen oxides by bringing them into contact with a catalyst in the presence of ammonia (see the following formulas (1) and (2)) is generally used, the main component of which is titanium dioxide and vanadium oxide (see, for example, Japanese Patent Application No. H7-275656). However, when ammonia is used in a large amount, or when the reaction conditions (such as space velocity, temperature, etc.) . Thus, there is known a method of contacting a platinum-supported alumina catalyst and oxidatively decomposing a...

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However, when ammonia is used in a large amount, or when the reaction conditions (such as space velocity, temperature, etc.)

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