Abstract
Adsorption data of nitrogen and methane on micro-porous activated carbon and on meso-porous silica gel were measured near the critical temperature. It was found that the values of the compressibility factor (z) exerted a significant effect on the behavior of isotherms. Selection of reliable z-values is very important for the analysis of experimental results obtained near the critical temperature. The isotherms on activated carbon always show type-I features at sub- and supercritical temperatures, but those on silica gel remarkably show a change from type-II at sub-critical temperatures to type-I at supercritical temperatures. The critical temperature appears to be shifted up in some case.
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Zhou, L., Zhou, Y., Bai, S. et al. A Study on the Adsorption Isotherms in the Vicinity of the Critical Temperature. Adsorption 8, 125–132 (2002). https://doi.org/10.1023/A:1020478301072
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DOI: https://doi.org/10.1023/A:1020478301072