| abstract |
(57) [Summary] [Purpose] The present invention relates to a denitration catalyst, and in particular to a catalyst that is less deteriorated by arsenic. [Structure] The honeycomb substrate surface containing V 2 O 5 , WO 3 and TiO 2 has the X-ray diffraction pattern shown in Table A described in detail in the present text, and in the dehydrated state (1 ± 0. 6) R 2 O ・ [aM 2 O 3 ・ 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, titanium, One or more elements selected from the group consisting of vanadium, chromium, niobium, antimony, and gallium, Me is an alkaline earth element, a ≧ 0, b ≧ 0, c ≧ 0, a + b = 1, y / A denitration catalyst for exhaust gas, which is coated with a crystalline silicate having a chemical composition of c> 12, y> 12) and further carries V or V and Ti which are active metals on the surface of the crystalline silicate. |