This study explores the application of Electrochemical Impedance Spectroscopy (EIS) as a diagnostic tool for investigating gas-solid interactions within microporous zeolitic frameworks. Current experiments focus on zeolites exposed to CO2 and inert gases under ambient pressure. Impedance measurements across a wide frequency range are evaluated through Nyquist and Bode plots, and Distribution of Relaxation Times (DRT) to resolve adsorption-related resistive and capacitive responses.
Emerging patterns, such as semicircular features and low-frequency dispersion, appear to reflect the interplay between surface adsorption and intra-pore diffusion mechanisms. These electrical signatures are being analysed in relation to structural parameters and compared against independently determined adsorption isotherms and estimated diffusivity. The overarching goal is to assess the viability of EIS for decoupling adsorption kinetics from transport resistances in solid adsorbents, potentially offering a complementary approach to classical gas adsorption methods,