Abstract
Defect-free mixed matrix membranes (MMMs) for natural gas separation obtained by adding SAPO-34 crystals to Hyflon® AD60X, a perfluoropolymer resistant to plasticization and tolerant to condensable hydrocarbons, are more permeable and selective (CO2/CH4 40 vs. 22) than the polymer. The experimental characterization of MMMs containing permeable and impermeable crystals of different size, shape and aspect ratio, and the macroscopic modeling of gas fluxes, allow to understand the mass transport phenomena at work. Polymer free volume increases at the interface, and barriers to the transport of gas are evidenced in the interior or on the surface of SAPO-34.
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