Taherizadeh, AlirezaAlirezaTaherizadehSimon, AdrianAdrianSimonRichter, HannesHannesRichterStelter, MichaelMichaelStelterVoigt, IngolfIngolfVoigt2024-05-272024-05-272024https://publica.fraunhofer.de/handle/publica/46876610.1016/j.memsci.2024.1228452-s2.0-85192461300Small-pore zeolites, such as CHA (0.38 nm), have pores that are comparable to the size of CH4 but larger than the size of CO2. As a result of the combination of diffusion and adsorption, these membranes are projected to have strong CO2/CH4 selectivity and CO2 permeance. During this work, SSZ-13 CHA membranes were synthesized, evaluated, and characterized by X-ray Diffraction, Field-Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, Fourier Transform Infrared Spectroscopy, Solid-State Nuclear Magnetic Resonance, and Thermogravimetric Analysis. Synthesized membranes on the inner surface of single channel alumina supports with a pore size of 200 nm and a length of 105 mm and an active membrane area of ∼17 cm2 showed an ideal permselectivity for CO2/CH4 of 122 (in the single gas permeation measurement) and a CO2 permeance of 36.1 × 10-7 [mol/(m2 s Pa)] and CO2/CH4 selectivity of 173 and a CO2 permeance of 6.5 × 10-7 [mol/(m2 s Pa)] for equimolar CO2 - CH4 mixture. According to the results, the membranes are capable of separating CO2 from natural gas and upgrading biogas for industrial purposes.enSSZ-13High-Si CHAZeolite membraneGas permeationBiogas upgradingjournal article