CO selective methanation is a promising route for the purification of CO in H-2-rich gas for on-board H-2-based fuel cells. Herein, we synthesized a Zr-modified SBA-15 supported Ni catalyst, which exhibits both high catalytic performance, deep-removing CO concentration to below 10ppm with a selectivity higher than 50% in a very low-temperature range (170-220 degrees C), and long-term stability. The results of XRD, XPS, TPR, TPD and TEM characterizations reveal that the doping of Zr not only improves the dispersion of Ni species, enhances the CO adsorption, but also suppresses the CO2 adsorption, resulting in the prominent catalytic performance. [GRAPHICS] .