Method for converting a gas comprising carbon monoxide into methane by means of a catalytic material containing praseodymium and nickel on alumina

A device for converting carbon monoxide (CO) into methane (CH4), which comprises:

• a reaction area, comprising a fluidized bed comprising a catalytic layer having a specific surface area (SStel) between 100 and 250 m2/g, the catalytic layer being obtained by activating a catalytic material by heat treating the catalytic material in the presence of reducing agents at a temperature in the range of 300-500° C., the catalytic material including praseodymium oxide (Pr6O11) associated with nickel oxide (NiO) and alumina (Al2O3), the respective proportions of which being, in the catalytic material, relative to the total mass of these three compounds:
• Pr6O11:
• 1 wt % to 20 wt %,
• NiO:
• 1 wt % to 20 wt %, and
• Al2O3:
• 60 wt % to 98 wt %;
• an inlet for passing an incoming gas including at least carbon monoxide (CO) over the catalytic layer in the reaction area,
• an outlet for releasing a product gas passed over the catalytic layer and including at least methane resulting from a catalytic reaction of the incoming gas passed over the catalytic layer in the reaction area;
• and
• heat exchange tubes disposed in said reaction area and being configured to maintain temperature of said reaction area and in said outlet below 300° C.