The CO methanation was studied over zeolite NaY supported Ni, Co3O4, ZrO2 catalysts. The XRD, N-2 physisorption and SEM analysis were used in order to characterize the catalysts. Catalytic activities were carried out under a feed composition 01 1% CO, 50% H-2 and 49% He between the 125 degrees C to 375 degrees C. Except for the Ni/CO3O4/NaY catalyst, all catalysts gave high surface area because of the presence of zeolite NaY. Average pore diameter of the catalysts fell into the mesopore diameter range. The highest CO methanation activity was obtained with Ni/ZrO2/NaY catalyst at which the CO methanation was started after 175 degrees C and 100% CO conversion was obtained at 275 degrees C using the same catalyst. (C) 2011 Elsevier B.V. All rights reserved.