Survey of dilution or adsorption enthalpies of a series of hygroscopic sorption materials

In order to assess the thermal behavior of water based sorption systems, isothermal titration calorimetry (ITC) experiments were done to measure the integral dilution enthalpies (ΔHD) of concentrated salt solutions via stepwise addition of water. Moreover the adsorption enthalpy (ΔHA) of different solids were measured with ITC as well. The data showing values of ΔHD in the range from 14 kJ/kg (KNO3) to −415 kJ/kg (NaOH) and ΔHA values from around 0.3 kJ/kg (MIL-53-AL) to −1380 kJ/kg (Zeolite XBF 13). Furthermore the titration results of the solid materials enable the possibility to calculate the adsorption capacity of these substances.