| 摘要 |
PURPOSE: To efficiently remove NOX and to prevent the discharge of ammonia by setting a denitration catalyst bed on the upstream side of a gas flow and a specified ammonia decomposing catalyst bed on the downstream side. CONSTITUTION: A denitration catalyst bed is set on the upstream side of a gas flow, and an ammonia decomposing catalyst bed capable of oxidizing and decomposing ammonia into nitrogen and NOX is set on the downstream side. The ammonia decomposing catalyst bed has a chemical composition (1±0.6)R2 O.[aM2 O3 .bAl2 O3 9147/28}.cMeO.ySiO2 when dehydrated (where R is alkali metal ion or hydrogen ion, M is >=1 kind selected from a group consisting of group VIII element, rare-earth element, titanium, vanadium, chromium, niobium, antimony and potassium, and Me is alkaline earth element), uses a crystalline silicate having an X-ray diffraction pattern as a carrier and contains at least one kind among platinum, palladium, ruthenium, iridium, and rhodium as an active metal. |
