'application of the BET equation should be restricted to the range where the term n(1 – p/p0) continuously increases with p/p0'see 5.2.2 in the reference This is one of the criterias IUPAC proposes for BET to be applied to micropores. What is the physical meanning of n(1 – p/p0) and why does it need to increase?

  • $\begingroup$ OK, I was tracking a little the meaning of it. Rouquerol's adsorption book traces it to the paper DOI: 10.1016/S0167-2991(07)80008-5 From this paper, it goes to the Keii article in Anal. Chem. (pubs.acs.org/doi/10.1021/ac50154a063) but in here I could not find it clearly. The other possible reference, is [6] J.B. Parra, J.C. de Sousa, R.C. Bansal, J.J. Pis and J.A. Pajares, Adsorption Sci. Tech., 11 (1994) 51. Which I don't have the book now to check... if I remember, I will look at it tomorrow back at the office. $\endgroup$
    – Nando
    May 31, 2018 at 12:22
  • $\begingroup$ I checked the paper by Parra et al. and it also does not explain much. Just mentions using the alternative linear form by Keii which is more sensitive to deviations from linearity. $\endgroup$
    – Nando
    Jun 1, 2018 at 6:17
  • $\begingroup$ I checked Keii's paper. I think the increasing of n(1 – p/p0) means the forming of monolayer. When it stops increasing, the second layer starts to form. $\endgroup$
    – wangge
    Jun 1, 2018 at 16:51


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