Sakai Motomu, Sasaki Yukichi, Kaneko Takuya, Matsukata Masahiko
Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan.
Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Atsuta-ku, Nagoya-shi, Aichi 456-8587, Japan.
Membranes (Basel). 2021 May 24;11(6):382. doi: 10.3390/membranes11060382.
The micropore volumes and effective pore sizes of two types of silicalite-1 membranes were compared with those of a typical silicalite-1 powder. The silicalite-1 membrane with fewer grain boundaries in the membrane layer showed similar micropore volume and effective pores size to those of the silicalite-1 powder. In contrast, when the silicalite-1 membrane contained many grain boundaries, relatively small micropore volume and effective pore size were observed, suggesting that narrowing and obstruction of the micropore would occur along grain boundaries due to the disconnection of the zeolite pore. The silicalite-1 membrane with fewer grain boundaries exhibited relatively high permeation properties for C-C hydrocarbons. There was an over 50-fold difference in benzene permeance between these two types of membranes. We concluded that it is important to reduce grain boundaries and improve pore-connectivity to develop an effective preparation method for obtaining a highly permeable membrane.
将两种类型的硅沸石-1膜的微孔体积和有效孔径与典型的硅沸石-1粉末的微孔体积和有效孔径进行了比较。膜层中晶界较少的硅沸石-1膜显示出与硅沸石-1粉末相似的微孔体积和有效孔径。相比之下，当硅沸石-1膜含有许多晶界时，观察到相对较小的微孔体积和有效孔径，这表明由于沸石孔的断开，微孔会沿着晶界变窄和堵塞。晶界较少的硅沸石-1膜对C-C烃表现出相对较高的渗透性能。这两种类型的膜之间的苯渗透率相差50倍以上。我们得出结论，减少晶界和改善孔连通性对于开发一种获得高渗透膜的有效制备方法很重要。
