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 27;11(6):399. doi: 10.3390/membranes11060399.
This study investigated the permeation behaviors of -hexane and 2-methylpentane through two-types of silicalite-1 membranes that have different pore-connectivity. The permeation mechanisms of these hydrocarbons were able to be explained by the adsorption-diffusion model. In addition, the fluxes through silicalite-1 membranes could be expressed by the modified Fick's first law. The hydrocarbon fluxes through S-1 with better pore-connectivity were ca. 3-20 times larger than those through S-1 with poor pore-connectivity. For these membranes with different pore-connectivity, the activation energy of diffusion of -hexane was 17.5 kJ mol for the membrane with better pore-connectivity and 18.0 kJ mol for the membrane with poorer pore-connectivity, whereas for 2-methylpentane it was 17.9 and 33.0 kJ mol, respectively. We concluded that the pore-connectivity in silicalite-1 membrane significantly influences the molecular diffusivities.
本研究考察了正己烷和2-甲基戊烷在两种具有不同孔连通性的硅沸石-1膜中的渗透行为。这些烃类的渗透机制可用吸附-扩散模型来解释。此外，通过硅沸石-1膜的通量可用修正的菲克第一定律来表示。通过孔连通性较好的S-1膜的烃通量比通过孔连通性较差的S-1膜的烃通量大约3至20倍。对于这些具有不同孔连通性的膜，正己烷在孔连通性较好的膜中的扩散活化能为17.5 kJ/mol，在孔连通性较差的膜中的扩散活化能为18.0 kJ/mol，而对于2-甲基戊烷，其扩散活化能分别为17.9 kJ/mol和33.0 kJ/mol。我们得出结论，硅沸石-1膜中的孔连通性显著影响分子扩散率。
