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- W2054999914 abstract "The paper examines the validity of two approaches frequently used to determine surface areas in activated carbons, namely the BET method and the use of immersion calorimetry. The study is based on 21 well characterized carbons, whose external and microporous surface areas, Se and Smi, have been determined by a variety of independent techniques. It appears clearly that SBET and the real surface area Smi + Se are in agreement only for carbons with average pore widths Lo around 0.8–1.1 nm. Beyond, SBET increases rapidly and SBET − Se is practically the monolayer equivalent of the micropore volume Wo. This confirms that a characterization of surface properties based on SBET is, a priori, not reliable. The study of the enthalpy of immersion of the carbons into benzene at 293 K, based on Dubinin’s theory, shows that ΔiH consists of three contributions, namely from the interactions with the micropore walls (−0.136 J m−2), the external surface (−0.114 J m−2), and from the volume Wo∗ of liquid found between the surface layers in the micropores (−141 J cm−3). It appears that for carbons where Lo > 1 nm, the real surface area cannot be determined in a reliable way from the enthalpy of immersion and a specific heat of wetting alone." @default.
- W2054999914 created "2016-06-24" @default.
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- W2054999914 date "2005-05-01" @default.
- W2054999914 modified "2023-09-23" @default.
- W2054999914 title "On the determination of surface areas in activated carbons" @default.
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- W2054999914 doi "https://doi.org/10.1016/j.carbon.2004.12.010" @default.
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