Characterisation of MCM-41 using regularization

Abstract

A new model for determining the pore size distribution of micro and mesoporous materials from gas adsorption isotherms has been proposed. The model uses the Dubinin-Rudushkevich (D-R) isotherm with Chen and Yang's correction at low pressures. For the mesopore region, a recent model of the authors which uses molecular-continuum model for multilayer region and the Unilan model for sub-monolayer region has been extended. The experimental adsorption data was inverted using regularization technique to obtain the pore size distribution. The family of model mesoporous adsorbent, MCM-41, was chosen for testing the present model. The present model was found to be successful in predicting the pore size distribution of pure as well as binary physical mixtures of MCM-41, with results in agreement with those from the XRD method.