Application of the LBET class models with the original fluid state model to an analysis of single, double and triple carbon dioxide, methane and nitrogen adsorption isotherms

The paper presents the results of the research on the application of the original LBET class adsorption models with the fast multivariant identification procedure and an original equation of state for gas as a tool for analysing the microporous structure of carbonaceous materials on the basis of high-temperature gaseous carbon dioxide, methane and nitrogen isotherms. The analysis involved single, double and triple adsorption isotherms, which is a unique approach to microporous structure analysis. On the basis of the results of calculations and analyses carried out during the presented research, it can be observed that LBET class models describe well the analyzed adsorption systems. Also, the concurrent analysis of two and three adsorption isotherms enhanced the accuracy of the determined invariant parameters, namely the volume of the first adsorption layer and cluster height, testifying to the effectiveness and justifiability of analysing multiple adsorption isotherms.