Preparation of Mixed Matrix Membranes Containing ZIF-8 and UiO-66 for Multicomponent Light Gas Separation

Abstract

Mixed matrix membranes (MMMs) containing zeolitic imidazolite framework-8 (ZIF-8) and UiO-66 as microporous fillers were prepared and evaluated their potential for the separation of a gas mixture produced by a methane reforming process. Hydrothermal synthesis was performed to prepare both the ZIF-8 and UiO-66 crystals, with crystal sizes ranging from 50 to 70 nm for ZIF-8 and from 200 to 300 nm for UiO-66. MMMs were prepared with 15% filler loading for both MMM (ZIF-8) and MMM (UiO-66). MMM (UiO-66) exhibited H2 permeability of 64.4 barrer and H2/CH4 selectivity of 153.3 for single gas permeation, which are more than twice the values that were exhibited by a neat polymer membrane. MMM (ZIF-8) also showed better separation properties than that of a neat polymer membrane with H2 permeability of 27.1 barrer and H2/CH4 selectivity of 123.2. When a gas mixture consisting of 78% Ar/18% H2/4% CH4 flowed into the membranes at 5 bar, the H2 purity increased to as high as 93%. However, no improvement in the mixture gas separation performance was achieved by the MMMs as compared to that of a neat polymer membrane.

High performance membranes containing zeolitic imidazolate framework‐8 and polysulfone for CO2 removal from CH4

“…Similar observations were also reported by Wijiyanti et al ., 61 whereby the CO 2 permeability and CO 2 /CH 4 separation factor for pure PSF in mixed gas condition dropped by 177% and 35%, respectively. On the other hand, the reduction of mixed gas separation performance in comparison with the single gas permeation was observed in previous works on MMMs 62,63 . However, in this work, an increase in CO 2 mixed gas permeability and CO 2 /CH 4 separation factor by 506% and 23%, respectively, was achieved for MMMs loaded with 1.0 wt% of ZIF‐8 compared to neat PSF membranes.…”

Doxorubicin Loaded-UiO-66-NH2 Coated With Poly(N-Vinylcaprolactam) For Controlled Release of Doxorubicin Against A549 Lung Cancer

“…The weight loss at temperatures lower than 200 °C could be attributed to the evaporation of solvents. The second weight loss ranging from 200-300 °C was due to the dihydroxylation of Zr 6 O 4 (OH) 4 to Zr 6 O 6 [43]. The main weight loss after 400 °C could be attributed to the decomposition of organic groups.…”

Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO 2 /CH 4 and H 2 /CH 4 separation

“…The reduction in gas separation performance was due to the competition between CO 2 or H 2 gas and CH 4 gas on the absorption side of the membrane [56]. In the study of Kim et al [57], the reduction in H 2 permeation was higher than CH 4 in the H 2 /CH 4 gas pair because H 2 gas had a lower critical temperature at 33.2 K compared with CH 4 gas (190.55 K). This caused the absorption of CH 4 gas to be greater than H 2 .…”