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- W2077305055 abstract "Laminated mordenite/ZSM-5 hybrid zeolite membranes were fabricated on seeded porous α-alumina tubes with ZSM-5 crystals by one-step hydrothermal treatment for dehydration of industrial solutions. The microstructure was clarified with observations by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometer (XRD) analysis on the membranes synthesized as a function of crystallization time. The synthesized hybrid membranes were composed by two layers. The upper mordenite layer overgrew with 2 μm thick above the ZSM-5 lower layer with 3 μm thick. The formation sequence was estimated to be that (1) the ZSM-5 layer crystallized in the early stage of 4 h; (2) then the mordenite crystals nucleated and grew on the lower ZSM-5 layer; (3) elongated mordenite grains crystallized for 4–8 h to form the tightly packed layer. The potential pervaporation (PV) performance of dehydration was investigated for industrial solvents of 2-propanol (IPA) and acetic acid (AAc). In the results of PV at 75 °C for a mixture of water (50 wt.%)/IPA (50 wt.%), the membrane exhibited higher permeation flux up to 6.4 kg m−2 h−1 and separation factors (α) with 1800. In the results of PV at 80 °C for a mixture of water (50 wt.%)/AAc (50 wt.%), a higher permeation flux with 5.6 kg m−2 h−1 and a small amount of leakage of AAc with 0.68 wt.% into the permeates or the separation factor α = 150 were observed. These higher separating features in the laminated mordenite/ZSM-5 hybrid membrane could be caused by tightly assemblage of mordenite crystals that were formed uppermost layer of the membrane." @default.
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- W2077305055 date "2012-09-01" @default.
- W2077305055 modified "2023-10-17" @default.
- W2077305055 title "Laminated mordenite/ZSM-5 hybrid membranes by one-step synthesis: Preparation, membrane microstructure and pervaporation performance" @default.
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- W2077305055 doi "https://doi.org/10.1016/j.micromeso.2012.04.053" @default.
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