| 摘要 |
A process for removing carbon monoxide from a gas stream containing hydrogen , carbon monoxide and carbon dioxide comprising subjecting the gas stream to a first stage high temperature selective catalytic methanation to lower the carbon monoxide concentration in the gas but not below a concentration which allows carbon dioxide methanatio n to take place followed by a second stage low temperature selective catalytic methanation to lower the residual carbon monoxide in the gas stream to a concentration below 40 ppm. The high temperature methanation is suitably carried out at a temperature between 250 .degree.C and 350 .degree.C and the low temperature methanation is suitably carried out at a temperature below 270 .degree.C. |
