Development and gas permeation properties of microporous amorphous TiO2–ZrO2–organic composite membranes using chelating ligands

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書誌事項

公開日
2014-07
資源種別
journal article
DOI
  • 10.1016/j.memsci.2014.02.031
公開者
Elsevier BV

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説明

Abstract Sol–gel derived microporous amorphous TiO 2 –ZrO 2 –organic composite membranes were prepared by two different types of chelating ligands, diethanolamine (DEA) and isoeugenol (2-methoxy-4-propenylphenol, ISOH) as reaction inhibitors for hydrolysis and condensation of Ti- and Zr-alkoxide. The structural properties of the composite gels were characterized via a thermogravimetric study (TG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and N 2 adsorption analysis; and the optimized calcination atmosphere and temperature conditions for a microporous membrane were examined. A crack-free thin (50 nm) TiO 2 –ZrO 2 –organic layer for gas separation was formed on a SiO 2 –ZrO 2 intermediate layer (150 nm) supported on a macroporous α-Al 2 O 3 substrate as an asymmetric membrane. Compared with DEA, more of the ISOH and its remnants effectively remained after calcination, which promoted higher permeance and selectivity as a microporous gas separation membrane by forming bimodal microporous structures that narrowed the original TiO 2 –ZrO 2 pores. A TiO 2 –ZrO 2 membrane with ISOH calcined at 350 °C under a N 2 atmosphere showed He and CO 2 permeances of 1.0×10 −6 and 2.0×10 −7  mol m −2  s −1  Pa −1 , respectively, at 200 °C. The CO 2 /N 2 permeance ratio was 6.4 at 200 °C and 46 at 35 °C.

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