High-permeance ZSM-5 zeolite membrane was prepared on porous tubular α-Al 2O 3 support by varying-temperature hydrothermal synthesis. XRD patterns show that the membrane consists of ZSM-5 zeolite crystals. SEM analys...High-permeance ZSM-5 zeolite membrane was prepared on porous tubular α-Al 2O 3 support by varying-temperature hydrothermal synthesis. XRD patterns show that the membrane consists of ZSM-5 zeolite crystals. SEM analysis indicates that few defects exist in the membrane and the thickness of the membrane is about 9 μm. The hydrogen permeance through the membrane is about 2.4×10 -6 mol/(m 2·s·Pa), and the separation factor for n-C 4H 10/i-C 4H 10 mixture (volume ratio 1∶1) is 40, which indicates that it has a high quality with high permeance and selectivity. Repeated nucleation and re-growth of the crystals on the support result in the dense membrane formation.展开更多
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 opt...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]展开更多
文摘High-permeance ZSM-5 zeolite membrane was prepared on porous tubular α-Al 2O 3 support by varying-temperature hydrothermal synthesis. XRD patterns show that the membrane consists of ZSM-5 zeolite crystals. SEM analysis indicates that few defects exist in the membrane and the thickness of the membrane is about 9 μm. The hydrogen permeance through the membrane is about 2.4×10 -6 mol/(m 2·s·Pa), and the separation factor for n-C 4H 10/i-C 4H 10 mixture (volume ratio 1∶1) is 40, which indicates that it has a high quality with high permeance and selectivity. Repeated nucleation and re-growth of the crystals on the support result in the dense membrane formation.
文摘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]
