Effect of ZIF-7 doping content on H2/CO2 separation performance of 1,2-bis(triethoxysilyl)ethane-derived organosilica membranes

Organosilica membranes with good hydrothermal stability are promising for pre-combustion capture, but the trade-off effect still constrains their gas separation performance. Herein, we prepared hybrid membranes by incorporating ZIF-7 nanoparticles into 1, 2-bis(triethoxysilyl)ethane (BTESE) networks to improve the H 2 /CO 2 permselectivity by the intrinsic properties of nanoparticles. The effect of inorganic fillers was investigated by adjusting the doping content of ZIF-7 nanoparticles. We found that the H 2 permeance of hybrid membranes remained at ∼10 −6 mol·m −2 ·s −1 ·Pa −1 , while the H 2 /CO 2 permselectivity decreased with increasing nanoparticle doping content. The E-ZIF-7-0.4 hybrid membrane showed H 2 permeance of 1.2 × 10 −6 mol·m −2 ·s −1 ·Pa −1 and H 2 /CO 2 permselectivity of 21.7. Our results may offer valuable insights into preparing hybrid membranes with optimal nanoparticle doping content.