Micropore structures of charcoal adsorbents
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Uniform and nonuniform micropore structures in charcoal adsorbents have been analyzed through adsorption and x-ray data and study of the more characteristic charcoal properties.
The formation of nonuniform micropore structures during the activation of carbonized organic materials by gaseous activating agents is discussed. The fundamental factor here is the lack of uniformity in the carbonized material and the carbonization process.
From the point of BMFT theory, the appearance of a nonuniform micropore structure in the charcoal adsorbent is probably associated with the formation of supermicropores, possibly through burn-out of the walls separating neighboring micropores.
The Stoeckli extension of the BMFT to adsorbents with nonuniform micropore structures is rational. The results obtained with the two-term BMFT equation are almost identical with those obtained with the more complex Stoeckli equation, over the entire range of micropore filling during the adsorption of various gases and vapors over a wide range of temperatures and on activated charcoals with widely dispersed micropore volumes.
KeywordsCharcoal Organic Material Entire Range Carbonize Material Activate Charcoal
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