Patent ID: 6482378
Filing Date: 2002-11-19
Classification: B01J,C01B

Abstract:
A method for selectively removing carbon monoxide, comprising: bringing a gaseous mixture containing H2, CO and an oxidizing agent of O2 into contact with a selective oxidizing catalyst of carbon monoxide for selectively oxidizing and removing CO from said gaseous mixture, said selective oxidizing catalyst of carbon monoxide comprising a carrier and an active metal comprising at least one kind of metal selected from the group consisting of Pt, Pd, Ru, Rh and Ir and supported on said carrier, said carrier comprising a crystalline silicate having the highest to the fifth highest peaks in the powder X-ray diffraction using CuK&agr; X-ray in the lattice spacing of 3.65Â±0.1 Ã¥, 3.75Â±0.1 Ã¥, 3.85Â±0.1 Ã¥, 10.0Â±0.3 Ã¥, and 11.2Â±0.3 Ã¥and said crystalline silicate having the composition represented by formula (1) under a dehydrated state:(1Â±0.8)R2O.[aM2O3.bNO.cAl2O3].ySiO2â€ƒâ€ƒ(1) where R denotes at least one element selected from the group consisting of an alkali metal and H, M denotes at least one element selected from the group consisting of VIII group elements, rare earth elements, Ti, V, Cr, Nb, Sb and Ga, N denotes at least one element selected from the group consisting of Mg, Ca, Sr, and Ba, and the molar ratios a, b, c and y are: 0&lE;a, 0&lE;b&lE;20, a+c=1, and 11&lE;y&lE;3000.