Abstract:Novel hollow-fiber carbon membranes were successfully fabricated using poly(phenylene oxide) (PPO) and derivatives as a precursor polymer. These free-standing carbon membranes had permeation properties above the upper bound of conventional polymeric membranes including PPO precursor polymers. Metal-containing carbon membranes derived from sulfonated PPO (SPPO) were also prepared by the ion exchange method and the effect of metal cations on the gas transport properties was studied. Transition metal ions such as… Show more
“…Membrane‐based gas separation technology develops rapidly in recent decades due to the advantages of high efficiency, energy saving, and environmental protection over traditional pressure swing adsorption and cryogenic distillation . As one promising member in the membrane family, carbon membranes have attracted extensive attention for their excellent gas separation performance and stability in harsh conditions .…”
A chemical crosslinking protocol was developed to prepare carbon membranes from 3,3 0 ,4,4 0 -oxydiphthalic dianhydride-4,4 0 -oxydianiline (ODPA-ODA) type polyetherimide on the support of phenolic resin sheets. The effects of support pretreatment, membrane-coating methods and crosslinking protocols on the resultant carbon membranes were investigated. The microstructure, functional group evolution, thermal stability, mechanics, morphology, and gas separation performance of samples were characterized by XRD, FTIR, TGA, mechanical testing technique, and gas permeation technique, respectively. Results have shown that the chemical crosslinking is more beneficial than the popular thermal crosslinking protocol to fabricate supported carbon membranes for the advantage of simple preparation process. In addition, spin-coating is superior to drop-coating in terms of good membrane formation on the support. Under the preferred preparation conditions of crosslinker ethylene glycol usage at 10 wt % and spin-coating, supported carbon membranes can be obtained with good hydrogen separation performance.
“…Membrane‐based gas separation technology develops rapidly in recent decades due to the advantages of high efficiency, energy saving, and environmental protection over traditional pressure swing adsorption and cryogenic distillation . As one promising member in the membrane family, carbon membranes have attracted extensive attention for their excellent gas separation performance and stability in harsh conditions .…”
A chemical crosslinking protocol was developed to prepare carbon membranes from 3,3 0 ,4,4 0 -oxydiphthalic dianhydride-4,4 0 -oxydianiline (ODPA-ODA) type polyetherimide on the support of phenolic resin sheets. The effects of support pretreatment, membrane-coating methods and crosslinking protocols on the resultant carbon membranes were investigated. The microstructure, functional group evolution, thermal stability, mechanics, morphology, and gas separation performance of samples were characterized by XRD, FTIR, TGA, mechanical testing technique, and gas permeation technique, respectively. Results have shown that the chemical crosslinking is more beneficial than the popular thermal crosslinking protocol to fabricate supported carbon membranes for the advantage of simple preparation process. In addition, spin-coating is superior to drop-coating in terms of good membrane formation on the support. Under the preferred preparation conditions of crosslinker ethylene glycol usage at 10 wt % and spin-coating, supported carbon membranes can be obtained with good hydrogen separation performance.
A heat pretreatment was developed to modify the microstructure and properties of the phenolic resin‐based carbon supports for the preparation of carbon membranes. The pore size distribution, porosity, surface functional groups, microstructure, and morphology of the supports were characterized by bubble pressure method, boiling method, infrared spectroscopy, X‐ray diffraction, and scanning electron microscopy, respectively. Furthermore, the optimum preparation conditions of the as‐prepared supports were validated by the fabrication of supported carbon membranes. The results show that the heat pretreatment at 280 °C is helpful for the supports to tolerate the high temperature of subsequent pyrolysis and improve the adhesion to surface carbon membrane layers. When supported carbon membranes were prepared by the heat pretreated supports, spin‐coating of 4 times, and pyrolysis at 650 °C, the ideal selectivities of H2/N2 and O2/N2 can reach 52.8 and 8.0, respectively.
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