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
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.
