Synthesis and CO2/N2 gas permeation characteristics of ZSM-5 zeolite membranes

Hierarchical Growth of Large‐Scale Ordered Zeolite Silicalite‐1 Membranes with High Permeability and Selectivity for Recycling CO2

“…Furthermore, the stainless-steel-net has open voids and the first layer of the membrane is almost b-oriented which facilitates easy access to the straight-channels of zeolite silicalite-1, as a result the CO 2 permeation factors are much higher than those reported to date. [29][30][31] In the Supporting Information, it is also noted that the separation factors of mixture gas are much higher than the ideal separation factors. It can be deduced that the preferred adsorption of CO 2 blocks the flow of N 2 , H 2 , CH 4 molecules through the zeolite silicalite-1 channels of the membrane.…”

CO2 Selective Separation Membranes

“…The gas permeances decreased at higher pressure, despite an increase of CO 2 /CH 4 and CO 2 /N 2 selectivities which was caused by the reduced competitive adsorption [100,120] . Interestingly, Shin et al reported that the separation factors of CO 2 /N 2 for Na-ZSM-5 membranes were nearly independent on the moisture in the feed [100] . However, after ion-exchange, the CO 2 /H 2 separation factors of Ba-ZSM-5 membranes increased when the moisture was added to the feed, which was ascribed to "sorption enhanced separation" [83] .…”

“…Similarly as FAU-type zeolite, molecular sieving effect does not play a signifi cant role in controlling the separations of CO fi 2 /N 2 and CO 2 /CH 4 [119] . The CO 2 permeation through ZSM-5 (MFI) membranes is suggested to be mainly governed by both mechanisms of adsorption/surface diffusion and the activated micropore diffusion; whilst the transport of N 2 may be only governed by the activated micropore diffusion [100] . The gas permeances decreased at higher pressure, despite an increase of CO 2 /CH 4 and CO 2 /N 2 selectivities which was caused by the reduced competitive adsorption [100,120] .…”

“…The CO 2 permeation through ZSM-5 (MFI) membranes is suggested to be mainly governed by both mechanisms of adsorption/surface diffusion and the activated micropore diffusion; whilst the transport of N 2 may be only governed by the activated micropore diffusion [100] . The gas permeances decreased at higher pressure, despite an increase of CO 2 /CH 4 and CO 2 /N 2 selectivities which was caused by the reduced competitive adsorption [100,120] . Interestingly, Shin et al reported that the separation factors of CO 2 /N 2 for Na-ZSM-5 membranes were nearly independent on the moisture in the feed [100] .…”

Depletion of Liquefied Petroleum Gas from Natural Gas by Zeolite Membranes

“…Selbst anspruchsvolle Gastrennungen sind mit Zeolithmembranen realisierbar. So kann beispielsweise an ZSM-5-Membranen Kohlendioxid aus einem Gemisch mit Stickstoff abgetrennt werden [16]. Daneben existieren verschiedene Arbeiten, die die Thematik der Trennung von Kohlenwasserstoff-Gemischen mittels Zeolithmembranen aus den verschiedensten Gesichtspunkten beschreiben.…”