Abstract
Rutile (chloride hydrolysate), alumina (Degussa aluminoxid C) and silica (Degussa aerosil TK800), outgassed at 673°K and then modified by preadsorption of water, ethanol, hexan- 1-ol, or hexan- 1:6-diol, have been characterized by nitrogen, n-pentane, ethanol, and water vapor adsorption isotherms. Strong interactions were found with rutile and weak interactions with silica while alumina shows intermediate behavior, as shown by the shape of the isotherms and the extent of adsorption, as well as by the retention levels (at about 10−3 Torr) of the preadsorbates which decrease in the order rutile > alumina > silica. Rutile is affected most by surface treatment resulting in low adsorption levels at low relative pressures and sometimes in different orientations of the adsorptives. The adsorption behavior of alumina and futile differs from that of silica because of the presence in their surfaces of strongly polarizing cations, while differences between alumina and rutile can be largely attributed to the much greater (essentially complete) dehydroxylation of the latter at 673°K.
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