Why do we calculate pore distribution by BJH desorption instead of BJH adsorption?

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Akmal Lutfi

Hi Christian

Thanks for the paper, It helped me much

Yujing Liu

Hi, after being struggling to read some publications, I would also like to add some references to help others to understand this problem because this problem was rose almost 5 years ago.

When you obtain an isotherm with a hysteresis feature (commonly it is a Type 4 isotherm) in nitrogen adsorption-desorption analysis (NADA), you are probably encountering adsorbents with complicated textures as well as capillary condensation caused by the occurrence of fluid-wall attraction and fluid-fluid interaction, resulting in a delayed vapour-liquid transition. That is, the equilibrium of vapour-liquid transition is commonly associated with desorption.

This is how I understand this question (I cannot 100% for sure), and I hope anyone who has the same question as me in the future can be helped.

I've attached a link to a paper (written by Thommes and Cychosz) that may help you: Article Physical adsorption characterization of nanoporous materials...