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CO2/H2 Selectivity Prediction of NaY, DD3R, and Silicalite Zeolite Membranes

Zito, Pasquale F., Caravella, Alessio, Brunetti, Adele, Drioli, Enrico, Barbieri, Giuseppe
Industrial & engineering chemistry process design and development 2018 v.57 no.33 pp. 11431-11438
adsorption, carbon dioxide, hydrogen, industry, prediction, temperature, zeolites
Using DD3R, silicalite and NaY zeolite membrane for gas separation is an attractive prospect for the development of a sustainable green process industry. The interest in CO₂ and H₂ lies in their relatively strong and weak adsorption in zeolite, respectively, causing a peculiar behavior of membrane selectivity, which is here evaluated in a wide range of temperature (273–573 K), feed pressure (100–500 kPa) and CO₂ molar fraction (0.05–0.95). As a result, CO₂/H₂ selectivity of the considered zeolite is found to be high at a low temperature owing to the relatively strong CO₂ adsorption with respect to the weak H₂ one. Differently, selectivity is much lower at a higher temperature because of the reduced adsorption strength. The temperature strongly affects the membrane selectivity through surface diffusion closely correlated to gas adsorption, and CO₂ adsorption results responsible for the high membrane selectivity in the low-temperature range.