Possibilities and Limits of Texture Properties Characterization

Abstract

A series of microporous-mesoporous mechanical mixtures of zeolite NaY and gamma-alumina was used for testing the applicabitity of the modified (three-parameter) BET isotherm equation. Nitrogen adsorption isotherms (77 K) of NaY+ gamma-alumina samples were analyzed by this equation and the results compared with the independent textural information obtained from t-plots (with the standard isotherm of nonporous alpha-alumina and the standard isotherms of Lecloux-Pirard). It appeared that the use of the modified BET equation as same as the standard t-plot method provided good micropore volumes and mesopore Surface areas contrary to the incorrect results of the classic BET equation.