Organic template-free synthesis of SAPO-34 molecular sieve membranes for CO2–CH4 separation

Abstract

Continuous SAPO-34 molecular sieve membranes have been rapidly synthesized on porous α-Al₂O₃ supports by secondary growth in the absence of organic templates under microwave-assisted heating. The thus obtained SAPO-34 membranes exhibit CO₂–CH₄ separation selectivity as high as 256, with CO₂ permeance higher than 1.68 × 10⁻⁶ mol m⁻² s⁻¹ Pa⁻¹ at 295 K for a pressure drop of 0.14 MPa.