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- W1968079894 abstract "Abstract Microporous carbon membranes were prepared on an α-alumina support by a pyrolysis of composites of a resorcinol/formaldehyde (RF) polymer and a quaternary ammonium compound (QAC). Tetramethylammonium bromide (TMAB) and tetrapropylammonium bromide (TPAB) were used as cationic surfactant. The results of N 2 adsorption, H 2 permeation and thermogravimetric measurements suggested that micropores appeared at 250 °C due to the decomposed gases from QAC in the RF/QAC composite resins, and the micropore volume increased at elevated temperature to 500 °C due to the gasification of QAC/RF resins. The pore sizes of the carbon membranes prepared using TMAB and TPAB were estimated to be about 0.4 and 0.5 nm based on the molecular size of the gases (H 2 , CH 4 , CF 4 and i -C 4 H 10 ) used in single gas permeations. The carbon membrane prepared using TMAB showed high selectivities to water in the pervaporation of H 2 O/ethanol and H 2 O/isopropanol mixtures. The carbon membrane prepared using TPAB showed a separation factor of 1155 for the H 2 O/IPA mixture at 30 °C. The high selectivity to H 2 O for the carbon membrane can be explained by not only the hydrophilic nature of the pore surface but also the molecular sieving effect." @default.
- W1968079894 created "2016-06-24" @default.
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- W1968079894 date "2010-05-01" @default.
- W1968079894 modified "2023-09-25" @default.
- W1968079894 title "Gas permeation and pervaporation of water/alcohols through the microporous carbon membranes prepared from resorcinol/formaldehyde/quaternary ammonium compounds" @default.
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- W1968079894 doi "https://doi.org/10.1016/j.seppur.2009.07.007" @default.
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