Comparison between ZIF-67 and ZIF-8 in Pebax® MH-1657 mixed matrix membranes for CO2 separation

Comparison of different MOF fillers on CO2 removal performance of supported PEBA mixed matrix membranes

“…This would reduce the formation of rigidified polymer area around the particles or sieve‐in‐a‐cage defects, a major problem that is more frequent in glassy polymers. Separation performance of various fillers in PEBA‐based MMMs was reported previously, such as ZIF‐300, 19 MOF‐801, 20 ZIF‐7, 21 SAPO‐34, 22 ZIF‐8, 23–26 , MIL‐101(Cr), 26 carbon nanotubes, 27,28 NaX, 29,30 TiO 2 , 31 ZSM‐5, 32 Fe 2 O 3 , 33 UiO‐66, 26,34 CuBTC, 15–17 and ZIF‐67 35 . Since ZIF‐67 and ZIF‐8 have similar size‐sieving pore diameters, comparing their separation performance would reveal other influential factors in their structure.…”

“…Separation performance of various fillers in PEBA-based MMMs was reported previously, such as ZIF-300, 19 MOF-801, 20 ZIF-7, 21 SAPO-34, 22 ZIF-8, [23][24][25][26] , MIL-101(Cr), 26 carbon nanotubes, 27,28 NaX, 29,30 TiO 2 , 31 ZSM-5, 32 Fe 2 O 3 , 33 UiO-66, 26,34 CuBTC, [15][16][17] and ZIF-67. 35 Since ZIF-67 and ZIF-8 have similar size-sieving pore diameters, comparing their separation performance would reveal other influential factors in their structure. Meshkat et al have recently investigated these fillers, though with a loading limited to 5%.…”

“…Meshkat et al have recently investigated these fillers, though with a loading limited to 5%. 35 According to gas permeation models for MMMs, this low loading would not suffice to judge the potential enhancement of a nanoparticle. In this work, a filler content ranging from 5 to 35 wt% is tried to get tangible results of MOF load.…”

Pebax‐based mixed matrix membranes loaded with graphene oxide/core shell ZIF‐8@ZIF‐67 nanocomposites improved CO2 permeability and selectivity

“…390°C for MMM vs. ca. 410°C for pure Pebax), fact attributed to the highly disturbed polymer chain arrangement due to the modification with the nanocomposites 36,55 …”

“…The 15 wt%IL@ZIF‐8 can increase the CO 2 permeability by 45%, CO 2 /CH 4 selectivity by 92%, and CO 2 /N 2 selectivity by 74%, respectively 35 . Rodrigue et al prepared MMMs based on Pebax by ZIF‐67 and a commercial ZIF‐8 to determine the effect of MOF weight percentage (0, 2, 3, 4, and 5 wt%) on gas permeability and found that ZIF‐8 and ZIF‐67 content increased the CO 2 permeability by 85% (130 barrer) and 130% (162 barrer), respectively, compared with the pristine Pebax membrane 36 . Feng et al successfully synthesized ZIF‐67 NS/Pebax MMMs and observed that 5.0 wt% ZIF‐67 nanoflakes incorporated in the MMMs enhanced both the CO 2 permeability to 139.4 barrer and the CO 2/ N 2 selectivity to 73.2, which correspond to an increase by 50.7% and 76.0%, respectively 37 .…”