| Abstract
| - In this article, a new hybrid model for estimating the pore size distribution of micro- and mesoporous materialsis developed, and tested with the adsorption data of nitrogen, oxygen, and argon on ordered mesoporousmaterials reported in the literature. For the micropore region, the model uses the Dubinin−Rudushkevich(DR) isotherm with the Chen−Yang modification. A recent isotherm model of the authors for nonporousmaterials, which uses a continuum-mechanical model for the multilayer region and the Unilan model for thesubmonolayer region, has been extended for adsorption in mesopores. The experimental data is inverted usingregularization to obtain the pore size distribution. The present model was found to be successful in predictingthe pore size distribution of pure as well as binary physical mixtures of MCM-41 synthesized with differenttemplates, with results in agreement with those from the XRD method and nonlocal density functional theory.It was found that various other recent methods, as well as the classical Broekhoff and de Boer method,underpredict the pore diameter of MCM-41. The present model has been successfully applied to MCM-48,SBA's, CMK, KIT, HMS, FSM, MTS, mesoporous fly ash, and a large number of other regular mesoporousmaterials.
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