CO2-selective membranes for hydrogen purification and the effect of carbon monoxide (CO) on its gas separation performance

PVDF/ionic liquid polymer blends with superior separation performance for removing CO2 from hydrogen and flue gas

“…It can be observed that the gas permeability of all the gases in mixed gas tests is slightly lower than those in pure gas tests. The reduced gas permeability in the mixed gas test can be attributed to the introduction of the second component in the gas feed which reduces the concentration of the other gas component in the membrane matrix [43,48,49]. The reduction of CO 2 permeability is more pronounced than those observed for H 2 and N 2 permeability, which leads to slightly reduced CO 2 /H 2 and CO 2 /N 2 selectivity in the mixed gas tests.…”

High performance ZIF-8/PBI nano-composite membranes for high temperature hydrogen separation consisting of carbon monoxide and water vapor

“…After passing through the permeation cell, the downstream sweep stream was introduced into a gas chromatography (GC) to detect the concentration of each penetrant. The steady state permeability (P A ) of each gas component was calculated using the following equation [61,68]:…”

“…Due to competitive sorption between highly condensable CO 2 (critical temperature: 304 K) and less condensable H 2 (critical temperature: 33 K) [35,42,61], the mixed gas data in terms of H 2 permeability and H 2 /CO 2 selectivity are lower than those of pure gas tests, as shown in Table 2. To further explore the contributions of solubility and diffusivity on the overall permeability, CO 2 sorption tests were conducted on pure PBI and ZIF-8/PBI nano-composite membranes.…”

“…As a consequence, besides investigating the temperature-dependent separation performance, we will examine the effects of impurities such as CO and H 2 O vapor on the newly developed membrane. So far, there are many reports on the effects of CO [55,56], water [55,57], H 2 S [58], NO [56], ethane [59] and toluene [60] on CO 2 /CH 4 and CO 2 /N 2 separations, and CO on CO 2 /H 2 separation [61], but almost no studies were focused on the influences of CO and H 2 O vapor to high temperature H 2 /CO 2 separation. Therefore, advanced characterizations and measurements will be carried out to study membrane morphology, permeation mechanism, and performance evolution at high temperatures in the presence of impurities.…”

CO2 capture and H2 purification: Prospects for CO2‐selective membrane processes

“…Most membranes reported in literature use polymeric materials with polar ether groups as the homogeneous phase. Typical fillers include fumed silica, sol–gel silica, polyhedral oligomeric silsequioxanes, carbon nanotubes, and carbon‐silica microspheres …”