Title of article :
The Modification of the BET Surface Area by Considering the Excluded Area of Adsorbed Molecules
Author/Authors :
Peyrovi, M.H Department of Computational and Physical Chemistry - Faculty of Chemistry and Petroleum Sciences - Shahid Beheshti University - Tehran, Iran , Abolhassanzadeh Parizi, M Department of Computational and Physical Chemistry - Faculty of Chemistry and Petroleum Sciences - Shahid Beheshti University - Tehran, Iran
Abstract :
The BET method is known as the conventional method for surface area measurements. Surface area is determined using the linearized
form of the BET equation to calculate the volume of the adsorbed gas in the monolayer. An adsorbed molecule occupies an area that is
inaccessible to other molecules on the surface. Taking this into account, this study reports on a correction factor k´, as the ratio of van der
Waals constant (b) and the molar volume of the liquid (v - ), that corrects the monolayer volume of the adsorbed gas obtained from the BET
model. The obtained correction factor will increase as the size of the molecule increases.
Keywords :
Excluded area , BET isotherm , Specific surface area , Surface area determination , Monolayer capacity , Excluded volume
Journal title :
Physical Chemistry Research
