晶种涂层对合成ZSM-5沸石膜影响

Study of effects of seeds on preparation of ZSM 5 membranes

分别利用打磨法和浸涂法在载体管上引入晶种 ,然后 170℃水热晶化 ,成功地合成了ZSM 5沸石膜 .实验发现引入晶种可减少水热晶化次数 ,在孔径为 0 .6 μm的载体上一次水热晶化即可完成 .XRD、SEM和单组分气体渗透对膜表征表明 ,该膜为完整、致密的ZSM 5膜 ,H2 /C3 H8的最大理想选择因数达到 33。

ZSM 5 membranes are successfully prepared on α Al 2O 3 tubes coated with seeds by hydrothermal treatments. The seeds are introduced by polishing directly or dip coating. It is found that the times of hydrothermal synthesis can be reduced. ZSM 5 membranes are prepared on supports featuring 0.6 μm pore diameter by only one synthesis step. Membranes are characterized by XRD, SEM and pure gas permeation measurements. The results show that it is dense and integral. The ideal selectivity of H 2/C 3H 8 is up to 33, which indicates the properties of molecular sieving of membranes.