Abstract
This paper deals with the application of the CPSM and α s , methods to determine microporosities of silica gels and microporous clays pillared with Al 1 -x Fe x O y oxidic species. A reasonably good agreement between the two methods was ascertained. However, the CPSM method evaluates slightly higher relative microporosities in the case of pillared clays. By raising the Fe content a decrease of the relative microporosity of pillared clays was observed. The CPSM method is most appropriate for the tracing of supermicropores i.e. pore sizes D p = 1-2 nm , as it is based on the assumption that an adsorbed gas monolayer exists. The CPSM model through the simulation of gas sorption hysteresis, enables a unified analysis of porous materials exhibiting mixed meso-micropore structures, involving evaluation of meso-micro pore size distribution , determination of pore surface area in good agreement with the corresponding values from a Langmuir equivalent model, estimation of tortuosity factors τ CPSM and detection of relative microporosity in satisfactory agreement with relevant data obtained by the α s method.
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