Patent ID: 8395009

Claim:
A process for selective methanization of carbon monoxide in hydrogen and carbon dioxide-containing streams, which comprises carrying out said selective methanization in the presence of a catalytically active composition which comprises ruthenium as the active component and a lanthanum-cerium-zirconium oxide as the support material, where the total loading of the support material with the active component is 0.1 to 20% by weight, based on the total weight of the catalytically active composition, and the support material comprises a lanthanum oxide content of 0.1 to 15% by weight, a cerium oxide content of 0.1 to 15% by weight and a zirconium oxide content of 30 to 99.8% by weight, based on the weight of the overall support material, wherein selective methanization is effected in a temperature range from 175 to 280° C., the selectivity for methanization of carbon monoxide in the hydrogen and carbon dioxide-containing streams by the catalytically active composition is greater than 60%, and carbon monoxide in the gas mixture from the outlet is depleted to less than 10 ppm.