Zeolite Y supported CuCl (CuCl/Y) has been prepared with CuCl2 as precursor by a monolayer dispersion method, followed by activation with CO. The samples are investigated for CO adsorption and characterized by inductively coupled plasma optical emission spectrometry, X-ray diffraction, N-2 adsorption/desorption and X-ray photoelectron spectroscopy. The characterization results reveal that CuCl2 supported on zeolite Y can be completely reduced to CuCl after activation at 663 K in CO, and the monolayer dispersion capacity of CuCI on zeolite Y support is 5 mmol/g zeolite Y. The resulting adsorbent displays high CO adsorption capacity, high CO/N-2, CO/CH4 and CO/CO2 adsorption selectivities, and excellent reversibility and regenerability. The adsorption equilibrium isotherms of CO on the adsorbents at temperatures up to 333 K can be well fitted by both the Langmuir and Sips models, and the integral thermodynamic data of Gibbs' energy change (Delta G), entropy change (Delta S) and enthalpy change (Delta H) are calculated from the fitted Langmuir adsorption equations. The negative Delta G and Delta H values indicate that the adsorption process of. CO on CuCl/Y adsorbent is spontaneous and exothermic. The negative Delta S value indicates that the adsorbed CO molecules on the adsorbent are in an ordered arrangement. (C) 2016 Elsevier B.V. All rights reserved.