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Zeolite ZSM 5 membrane, whose permeance was up to 10 -6 mol/(m 2·s·Pa) and a magnitude higher than that of other groups, was prepared on α Al 2O 3 support by multi in situ hydrothermal treatments, using optimized sol prescription and cheap n butane as the structure directing agent. The membrane was characterized by means of XRD, SEM and single gas permeances measurements, which showed that it was dense and integral without large intercrystal pores and cracks. The permeance of H 2, N 2, C 3H 8 and n C 4H 10 was up to 2.35×10 -6 , 1.0×10 -6 , 1.13×10 -7 and 4.9×10 -8 mol/(m 2·s·Pa), respectively. Ideal selectivity of H 2/N 2, H 2/C 3H 8 and H 2/ n C 4H 10 was 2.45, 20.8 and 48, respectively. [WT5HZ]
The zeolite ZSM 5 membrane, whose permeance was up to 10 -6 mol / (m 2 · s · Pa) and a magnitude higher than that of other groups, was prepared on α Al 2 O 3 support by multi in situ hydrothermal treatments, using optimized sol prescription and cheap n butane as the structure directing agent. The membrane was characterized by means of XRD, SEM and single gas permeances measurements, which showed that it was dense and integral without large intercrystal pores and cracks. The permeance of H2, N 2, C 3H 8 and n C 4H 10 was up to 2.35 × 10 -6, 1.0 × 10 -6, 1.13 × 10 -7 and 4.9 × 10 -8 mol / (m 2 · s · Pa), respectively. Ideal selectivity of H 2 / N 2, H 2 / C 3H 8 and H 2 / n C 4H 10 was 2.45, 20.8 and 48, respectively. [WT5HZ]