Insight into the thermodynamics of hydrogen sulphide adsorption through multi-temperature fit of the related isotherms
DOI:
https://doi.org/10.55225/sti.706Keywords:
hydrogen sulfide, adsorption, thermodynamics, multi-molecular cooperative sorption model, multi-temperature descriptionAbstract
Adsorption of hydrogen sulphide is a process of practical importance, among others, in the context of biogas desulphurization. Its full understanding may require knowledge about the related thermodynamic aspects. In the current study, the possibility of indirectly obtaining such data based on mathematical modelling of the temperature dependence of H₂S adsorption isotherms is examined. For this purpose, a cooperative multimolecular sorption model was selected as the theoretical isotherm equation. It was used to simultaneously fit several sets of experimental data on a multi-temperature way. Such an approach, despite certain limitations, is an effective tool for modelling hydrogen sulphide adsorption on the studied activated carbons and zeolites. Furthermore, it allows for the straightforward calculation of thermodynamic quantities characterizing the process: the isosteric enthalpy of adsorption and the entropy of the adsorbed phase. In the study, curves reflecting the changes in these functions with adsorption progress were successfully determined and analyzed, supplementing the quantitative characterization of the process.
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