This paper presents the results of adsorption and permeation experiments of hydrogen and methane at elevated temperatures on a carbon-based nanoporous membrane material provided by Fraunhofer IKTS. The adsorption of pure components was measured between 90 °C and 120°C and pressures up to 45 bar. The Langmuir adsorption isotherm shows the best fit for all data points. Compared to available adsorption isotherms of H₂ and CH₄ on carbon, the adsorption on the investigated nanoporous carbon structures is significantly lower. Single-component permeation experiments were conducted on membranes at temperatures up to 220 °C. After combining the experimental results with a Maxwell–Stefan surface diffusion model, Maxwell–Stefan surface diffusion coefficients ${\mathcal{D}}_i^s$ were calculated. The calculated values are in line with an empirical model and thus can be used in future multi-component modeling approaches in order to better analyze and design a membrane system. The published adsorption data fill a gap in the available adsorption data for CH₄ and H₂.

This study investigates binary mass transport of methane (CH4) and hydrogen (H2) through carbon-based nanoporous membranes at elevated temperatures. Building upon previous single-component adsorption and permeation measurements, we present new binary permeation experiments conducted up to 220 °C and develop a predictive transport model based on the Maxwell–Stefan (M–S) framework. Initial model predictions underestimated H2 flux, which were resolved by incorporating a confinement correction to account for slit pore geometry and a temperature-dependent scaling factor. These modifications significantly improved model accuracy and alignment with experimental data. The refined model was extrapolated to 500 °C and varying gas compositions to evaluate membrane selectivity under relevant process conditions, thus offering predictive capabilities for membrane-based separations applicable to hydrogen production and carbon utilization.