Pore Size Distribution off "in situ" Coated Silica Gels Determined by Exclusion Chromatography

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Abstract
It will be shown that with an exclusion chromatographic method the pore size distribution of solids can be estimated. Moreover, the changes in pore structure due to in situ-coating can be monitored. Chromatographic columns packed with silica gels of different mean pore diameters (SI-60, SI-100, SI-500, and Be 74/3) have been dynamically coated with formamide as the liquid stationery phase. Pore size distributions have been experimentally determined as a function of the coating level. For low coating levels the pore volume of small pores first increases, reaches a maximum, and then decreases. For pores with greater diameters a steady decrease in the pore volume was observed. The experimental results might be of interest for the mechanism of catalysis. The result will be explained with a simple steric exclusion model. The differences in the interstitials porosity between the spherical and irregular shaped silica, as determined by experiments, seem to be remarkable (εZ = 0.33–0.47).

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