2
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type H3 and H4 are classification of IUPAC for hysteresis loops

BET applies to type 2 and 4. That is basically unanimous.

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closed as unclear what you're asking by Tyberius, airhuff, Todd Minehardt, a-cyclohexane-molecule, Jon Custer Jan 17 '18 at 14:02

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ You should elaborate and put some links. $\endgroup$ – Mithoron Jan 16 '18 at 23:05
  • $\begingroup$ This is enough.If you know the field, you will know what I am talking about. $\endgroup$ – wangge Jan 18 '18 at 3:11
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The sample that shows loop of H3 type have (very likely) no micropores (small uptake in low p/p0 range). In this case you can apply BET theory in common p/p0 range (0.05-0.3). The sample that shows H4 hysteresis have micropores (large uptake in low p/p0 range). The BET theory can be applied here, but in a much lower p/p0 range. For activated carbon, for example, one would look for a linear(!) range between p/p0 = 0.02-0.1. Generally, the BET theory is not suitable for microporous materials.

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