| abstract |
(57) [Summary] (Modified) [Purpose] A method of decomposing and removing ammonia contained in various exhaust gases into harmless nitrogen. In a method for decomposing and removing ammonia by bringing a gas containing ammonia into contact with an ammonia decomposing catalyst, (1 ± 0.8) R 2 O · [aM 2 O 3 is used as an ammonia decomposing catalyst in a dehydrated state.・ BAl 2 O 3 ] ・ cMeO.ySiO 2 (wherein R is an alkali metal ion and / or a hydrogen ion, M is a Group VIII element, a rare earth element, One or more elements selected from the group consisting of titanium, vanadium, chromium, niobium, antimony and gallium, Me is an alkaline earth element, a ≧ 0, b ≧ 0, c ≧ 0, a + b = 1. A method of decomposing and removing ammonia using a carrier comprising a crystalline silicate having a chemical composition of 1, y / c> 12, y> 12) and a catalyst having ruthenium supported as an active metal on another carrier. |