A novel process has been developed for synthesis of the silica supported dicopper(ll) complex catalyst in which one Cu atom exchanging with two ion exchange sites on the surface of silica. The material was synthesized by reaction of NaOEt modifying the silica surface with dicopper(II) complex [Cu-2(mu -Cl)(2)](ClO4)(2). 8H(2)O synthesized as pre-catalyst. The structure of the catalyst has been characterized comparatively with the dicopper(II) complex by element analysis. IR spectra and electronic spectra. The reaction of CO2 with EO (ethylene oxide) has been investigated by temperature programmed desorption and in situ IR spectroscopy. TPD and IR results indicated that CO2 and EO can be chemisorbed on the surface of the catalyst reversibly and desorbed at 393 and 378 K, respectively. TPSR-MS experiments have shown that EO desorbed dissociatively at high-temperature to form desorbed CO and CH4 species. CO2 and EO react on the surface in the temperature range of 353-397 K. In TPSR-IR investigation, EC (ethylene carbonate) produced was detected at 353 K, which is lower than the reported temperature of 393 K for homogeneous catalytic reaction.