CuCl_2/NaY体系表面分散态研究  

Study of Dispersion State of CuCl_2 onto the Surface of NaY Zeolite

作　　者：林承志[1] 蔡小海[1] 谢有畅[1] 

机构地区：[1]北京大学物理化学研究所

出　　处：《物理化学学报》1996年第6期523-526,共4页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：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.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.

关 键 词：自发单层分散 X射线衍射 NAY分子筛 氯化铜 

分 类 号：O643.36[理学—物理化学]