Abstract
Polyethersulfone (PES) and MFI-type zeolite mixed matrix membranes (MMMs) were successfully fabricated by a novel particle suspension impregnating and solution-casting method. The effects of two different membrane preparation methods on the membrane morphology were investigated by scanning electron microscopy; the particle crystal type and distribution were explored by X-ray diffraction and fourier transform attenuated total reflectance infrared spectroscopy. The results showed that the MFI-zeolite particles were successfully synthesized, with particle diameter around 250 nm. Distribution and dispersion of MFI-zeolite particles suspended in the polymer matrix are homogeneous and uniform. The thermal analysis indicates that the glass transition temperature (T g) of MMMs is around 230 °C and the initial degradation temperature is up to 460 °C in air. The increment of T g compared to the neat PES confirms that the polymer chain rigidification is induced by zeolite particles. The MMMs have been evaluated by the CO2/N2 separation factor and permeability measured as a function of permeation temperature, the maximum separation factor of the PES/10 % MFI-silica zeolite for the pure gas reaches 35 at 25 °C.
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Acknowledgements
Appreciation is expressed to the State of New Mexico through the Petroleum Recovery Research Center of New Mexico Tech for their support. The authors would like to thank Ms. Liz Bustamante for editing the manuscript.
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Fig. 1. TG curves of MMMs with the particle loading from 0 to 15 %. (DOC 40 kb)
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Yu, J., Li, L., Liu, N. et al. An approach to prepare defect-free PES/MFI-type zeolite mixed matrix membranes for CO2/N2 separation. J Mater Sci 48, 3782–3788 (2013). https://doi.org/10.1007/s10853-013-7178-z
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DOI: https://doi.org/10.1007/s10853-013-7178-z