关键词: B-Al-ZSM-5, 定向沸石膜, 纯气体透过性, 乙醇/水分离

Permeabilities of pure gases and separation selectivities of ethanol/water systems through the oriented B-containing MFI-type zeolite membranes and the initial porous glass disks were studied.The initial porous glass disks displayed the selectivities of Knudsen diffusion for the permeating of pure gases, showing that the gases penetrated through the initial substrates by Knudsen diffusion.On the calcined zeolite membranes, the ideal selectivities of H₂, He, Ne, Ar, O₂ and CO₂ over N₂ are 16.8, 15.6, 12.6, 9.41, 8.60 and 5.32, CO and SO₂ over N₂ are 0.135 and 0.0179, respectively.However, the ideal selectivities of O₂ over CO and SO₂ reach 63.7 and 480.2, respectively.The fact shows that the calcined zeolite membranes not only possess better ideal selectivities for the permeation of pure gases, but also can serve as the good alternative for making novel gas masks.On pervaporation, the initial porous glass disks display nearly no separation performance to all the three solutions within the measured temperatures.The highest water separation factors appearing at 303 K are 28.2, 135.7 and 518.8 for the solutions of 5 wt%, 50 wt% and 95 wt% EtOH/H₂O at different temperatures, respectively, indicating that the prepared membranes are strongly hydrophilic.

Key words: B-Al-ZSM-5, zeolite membrane with c-axis orientation, permeability of pure gas, separation of ethanol/water system