【Abstract】 Five CuCl2/NaY sytems prepared with different methods were studied byXRD. One system is prepared by giving heat treatment to the solid mixture of CuCl2and NaY. The other four systems are all prepared by impregnation methods ,Nay impregnated in CuCl2 solution of absolute alcohol, 0.05 mol·L（- 1） H2SO4, de-ionized waterand 0.1 mol·L^-1 HCl respectively. The resuits show that under certain conditons,CuCl2could spontaneously disperse onto the NaY surface. The maximum dispersion capacity（threshold） is much larger than the amounnt of Cu ions exchanged onto NaY surface byion exchange methods. The thresholds are very different according to differe preparation processes. They are subject to two factors: the water adsorbed on NaY surface andthe prior adsorption of HCl on NaY surface. These two factors can markedly reduce thethreshold of CuCl2 on the surface of NaY zeolite. Meanwhile, under certain conditions,the dispersion state of Cu ion NaY surface could be changed obviously. The higher thepH value of NaY zeolite surface and the calcination temperation, the more obvious thehydrolization of CuCl2.更多还原