Excess adsorption and volumetric storage capacity uptakes agreed well between the two measurements.
In addition, the excess adsorption capacity of methane first increased after the pressure drop.
Figure 11 shows the methane excess adsorption isotherms for different water contents.
The results from the electrocapillarity maximum data suggest excess adsorption of the nitrate anions at low EAN concentrations and excess adsorption of the ethylammonium cations at higher concentrations.
However, it also showed that the methane excess adsorption capacity gradually decreased as the pore size increased in the mesopores, and the excess adsorption capacity of methane in mesopores is significantly smaller than that in micropores.
Figure 3 shows a schematic representation of the excess adsorption amount and absolute adsorption amount in which the area of a represents the excess adsorption amount and the total area of a and b expresses the absolute adsorption amount.
The excess adsorption isotherms are modeled using a multi-temperature Toth equation, which provides an excellent description.
The Langmuir-like equation is not suit to the data fitting between excess adsorption amount and adsorption equilibrium pressure.
