| abstract |
(57) [Problem] To provide a carbon monoxide selective oxidation catalyst capable of selectively oxidizing CO from a gas containing H 2 , O 2 and CO by the O 2 . SOLUTION: In a dehydrated state, it has a composition represented by the formula (1), and in a powder X-ray diffraction using CuKα ray, a lattice spacing 3.65 ± 0.1Å, 3.75 ± 0. 1Å, 3.85 ± 0.1Å, 10.0 ± 0.3Å and 1 A crystalline silicate having a peak from the strongest peak to the fifth place at 1.2 ± 0.3 °, and at least one metal selected from Pt, Pd, Ru, Rh and Ir supported on the crystalline silicate; And H 2 , O 2 and CO CO is selectively oxidized by the O 2 from a gas containing |