煅烧
渗透
无定形固体
材料科学
分子
化学工程
化学
膜
有机化学
催化作用
生物化学
工程类
作者
Hiroki Inde,Masakoto Kanezashi,Hiroki Nagasawa,Toshimi Nakaya,Toshinori Tsuru
出处
期刊:ACS omega
[American Chemical Society]
日期:2018-06-13
卷期号:3 (6): 6369-6377
被引量:12
标识
DOI:10.1021/acsomega.8b00632
摘要
A SiOC membrane with high oxidative stability for gas separation was tailored by utilizing vinyltrimethoxysilane, triethoxysilane, and 1,1,3,3-tetramethyldisiloxane as Si precursors. Amorphous SiOC networks were formed via the condensation of Si-OH groups, the hydrosilylation of Si-H and Si-CH=CH2 groups, and a crosslinking reaction of Si-CH3 groups, respectively. The crosslinking of Si-CH3 groups at temperatures ranging from 600 to 700 °C under a N2 atmosphere was quite effective in constructing a Si-CH2-Si unit without the formation of mesopores, which was confirmed by the results of N2 adsorption and by the gas permeation properties. The network pore size of the SiOC membrane calcined at 700 °C under N2 showed high oxidative stability at 500 °C and was appropriate for the separation of large molecules (H2/CF4 selectivity: 640, H2/SF6: 2900, N2/CF4: 98). A SiOC membrane calcined at 800 °C showed H2/N2 selectivity of 62, which was approximately 10 times higher than that calcined at 700 °C because the SiOC networks were densified by the cleavage and redistribution reactions of Si-C and Si-O groups.
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