Abstract
CO 2-selective membranes have a variety of applications, such as synthesis gas purification, natural gas sweetening, and greenhouse gas sequestration. In this study, CO 2-selective membranes containing both mobile and fixed carriers in crosslinked poly(vinyl alcohol) were synthesized. Transport properties of membranes, including CO 2 flux and permeability, H 2 flux and permeability, CO 2/H 2 selectivity, and CO 2/N 2 selectivity, were studied with a gas stream consisting of hydrogen, carbon dioxide, and nitrogen. The effects of feed pressure, water content, and temperature on transport properties were investigated. The membranes showed good CO 2 permeabilities and CO 2/H 2 selectivities up to 170 °C. At 120 °C, the CO 2 permeability and CO 2/H 2 selectivity reached 8200 Barrers (1 Barrer = 10 −10 cm 3 (STP) cm/(cm 2 s cm Hg)) and 450, respectively. The synthesized membranes also had high CO 2/CO selectivities in the temperature range of 100–170 °C.
Published Version
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