10.6084/m9.figshare.8015528.v1 L. H. de Oliveira L. H. de Oliveira J. G. Meneguin J. G. Meneguin M. V. Pereira M. V. Pereira J. F. do Nascimento J. F. do Nascimento P. A. Arroyo P. A. Arroyo Adsorption of hydrogen sulfide, carbon dioxide, methane, and their mixtures on activated carbon Taylor & Francis Group 2019 Activated carbon Carbon dioxide Extended Langmuir Extended Tóth Gas adsorption Hydrogen sulfide IAST Langmuir isotherm Tóth isotherm 2019-04-19 07:29:17 Journal contribution https://tandf.figshare.com/articles/journal_contribution/Adsorption_of_hydrogen_sulfide_carbon_dioxide_methane_and_their_mixtures_on_activated_carbon/8015528 <p>H<sub>2</sub>S and CO<sub>2</sub> are acid contaminants of natural gas and biogas, which removal have been studied using adsorption data for monocomponent and binary mixtures. However, equilibrium adsorption data for H<sub>2</sub>S + CO<sub>2</sub> + CH<sub>4</sub> mixture has not been investigated yet. In this work, H<sub>2</sub>S and CO<sub>2</sub> partition coefficients (<i>K</i>) and activated carbon (AC) selectivity (<i>S</i>) for H<sub>2</sub>S + CO<sub>2</sub> + CH<sub>4</sub> mixture separation at high-pressure and different temperatures were determined. To reach this goal, monocomponent isotherms for H<sub>2</sub>S, CO<sub>2</sub> and CH<sub>4</sub> on Brazilian babassu coconut hush AC were experimentally determined at different temperatures and pressures. Then, obtained data were correlated by Langmuir and Tóth models, and multicomponent adsorption was predicted using Extended Langmuir, Extended Tóth and Ideal Adsorption Solution Theory (IAST) methods. Results indicate AC captures approximately 26 wt% of H<sub>2</sub>S or CO<sub>2</sub>. <i>K</i> values for CO<sub>2</sub> and H<sub>2</sub>S reached more than 3 and 26, respectively, depending on the predictive model utilized and were higher for diluted mixtures (high CH<sub>4</sub> content in gas phase). <i>S</i> values for CO<sub>2</sub> and H<sub>2</sub>S can reach values greater than 25 for Tóth + IAST. Furthermore, selectivity toward H<sub>2</sub>S is approximately 5.6 times greater than CO<sub>2</sub>. The effect of temperature on multicomponent results indicate <i>K</i> and <i>S</i> values decrease as temperature increases. Therefore, results obtained herein show that is possible to separate H<sub>2</sub>S and CO<sub>2</sub> from mixture containing CH<sub>4</sub> using this AC as adsorbent and better separation performance was observed for low H<sub>2</sub>S and CO<sub>2</sub> concentrations and lower temperatures.</p>