| abstract |
(57) [Abstract] [Purpose] A method for decomposing ammonia contained in various exhaust gases into harmless nitrogen. In a method of decomposing and removing ammonia by bringing a gas containing ammonia into contact with an ammonia decomposition catalyst, the ammonia decomposition catalyst in a dehydrated state, (1 ± 0.8) R 2 O ・ [aM 2 O 3 ・ bAl 2 O 3 ] CMeO.ySiO 2 (wherein R is an alkali metal ion and / or hydrogen ion, M is one or more selected from the group consisting of Group VIII elements, rare earth elements, titanium, vanadium, chromium, niobium, antimony, and gallium. Elements of Me is an alkaline earth element, a ≧ 0, b ≧ 0, c ≧ 0, a + B = 1, y / c> 12, y> 12) and a carrier made of crystalline silicate having a specific X-ray diffraction pattern or a specific single oxide, complex oxide, or solid superacid. A method for decomposing ammonia using a catalyst in which platinum is supported as an active metal on a carrier made of various zeolites. |