Patent ID: 6913738
Filing Date: 2005-07-05
Classification: B01D,C01B,C10K,H01M,Y02E

Abstract:
1. A method of removing carbon monoxide from a hydrogen-containing treatment-object gas containing hydrogen as its major component and carbon dioxide, the method comprising: a first step of causing the treatment-object gas to contact a first metal catalyst comprising one or more kinds selected from the group consisting of Ru, Pt, Rh, and Pd and capable of methanating carbon monoxide at a temperature where methanation of carbon monoxide takes place by the first metal catalyst so that a portion of the carbon monoxide is removed through carbon monoxide methanation and where methanation of the carbon dioxide is restricted; and a second step of causing the treatment-object gas from the first step together with an oxidizing agent to contact a second metal catalyst capable of oxidizing carbon monoxide so that a remaining portion of carbon monoxide is removed mainly through carbon monoxide oxidation, wherein in the first step, a carbon monoxide concentration of the treatment-object gas is reduced to 30% or lower of an original carbon monoxide concentration of the treatment-object gas charged into the first step.