H₂/CO₂ Gas Transport Performance in Poly (Ethylene Oxide) Reverse-selective Membrane with Star-like Structures

Abstract

A series of poly (ethylene oxide) (PEO) membranes with star-like structures for CO₂/ H₂ separation were prepared by the photo-polymerization method. The structure of PEO membrane was characterized by Fourier transform infrared spectroscopy (FTIR). The thermal property and inter-segmental distance of polymer chain were investigated by differential scanning calorimetry and wide-angle X-ray diffraction, respectively. The density was determined by hydrostatic weighing method. The gas permeability, solubility and diffusivity of CO₂ and H₂ were investigated in the star-like PEO membranes. The relationship between gas permeation performances and physical properties was also discussed. The membrane exhibits outstanding CO₂ permeability (about 9.7×10^-11 cm³ (STP) cm/cm²/s/Pa) and CO₂/H₂ selectivity (about 11) compared with other membranes.

Keywords

hydrogen purification / reverse-selective membrane / poly(ethylene oxide) / star-like structure

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