Abstract
The gas phase chromatographic methods described for determining the surface area of porous materials can be applied to hydroxylated adsorbents such as silica gels, activated aluminas and oxides and to materials coated with hydroxylated liquids. These determinations are not based on the area occupied by a volatile sorbate in a monolayer according to the chromatographic variation of the BET method, but are based on the measurement of the area of a stationary phase monolayer by inverse gas chromatography. The application of one of the methods to macroporous materials leads to determinations that are probably more accurate and certainly more precise than any other previously described. The results give some insight into the physical state and the site occupied by “stationary phases” in porous media.
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