I have recently performed a BET analysis of a powdered sample and the adsorption isotherm is similar to Type I with no hysterisis. Inorder to calculate the micro-pore volume and total pore volume, if I consider the BJH data, I can find the cumulative pore volume up to 2 nm from the data, which I considered to be micro-pore volume. Whether this is correct?
I am confused since pore volume has been reported in all the 3 data (BET, BJH and NLDFT) and may have different interpretations. Different literatures report in different ways. For my case, from which data should I consider for estimating total pore volume, micro, meso/macro pore volume (total pore volume-micro pore volume)?
All the methods you mentioned have different assumptions. So basically they are not 100% compatible.
If your solid is type I isotherm, the simplest way is to use NLDFT, QSDFT or 2D-NLDFT if available in your software. Otherwise you can use the venerable Horvath-Kawazoe method.
If you use BJH you will get wrong results since it assumes mesopore filling.
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