AN INVESTIGATION OF THE DISPERSION OF CuCl ON γ-Al2O3 SURFACE AND THE ADSORPTION OF ETHYLENE ON CuCl/γ-Al2O3 AND OTHER SUPPORTED TRANSITION METAL SALTS

摘要

＜正＞ In this work we investigate the dispersion of CuCl on γ-Al2O3 surface and the adsorptionof ethylene on CuCl/γ-Al2O3. X-ray diffraction experiments and u.v. diffuse reflectancespectra have shown that CuCl is highly dispersed on γ-Al2O3 surface, very likely as a mono-layer. The maximun amount of dispersion of CuCl on γ-Al2O3 surface determined by X-ray quantitative phase analysis is 0.095 g CuCl/100 M~2 on γ-Al2O3. The adsorption ofethylene on dispersed CuCl can be conveniently studied by the temperature programed de-sorption （TPD） method and shown to be achieved readily at ambient temperature and nor-mal pressure. The ability of adsorption for ethylene on CuCl/γ-Al2O3 is greater by threeorders of magnitude than that on undispersed CuCl particles of comparable size. The max-imum molecular ratio of ethylene adsorbed to dispersed CuCl is 0.19 C2H4/Cu+. The cu-prous ions of dispersed CuCl can form surface complex with molecules such as C2H4 or C3H6so long as the stereochemical conditions are satisfied. These results may provide additionalscientific basis for separating unsaturated molecules from saturated ones by CuCl/γ-Al2O3.