Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation

›› 2011, Vol. 19 ›› Issue (3): 404-409.

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Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation

QI Hong

Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received:2010-08-13 Revised:2011-01-29 Online:2011-06-28 Published:2011-06-28
Supported by:
Supported by the National Natural Science Foundation of China(20906047);the State Key Laboratory of Chemical Engineering(SKL-ChE-09A01);the State Key Laboratory of Materials-Oriented Chemical Engineering(ZK201002)

Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation

漆虹

Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

通讯作者: QI Hong, E-mail: hginjut@yahoo.com.cn
基金资助:
Supported by the National Natural Science Foundation of China(20906047);the State Key Laboratory of Chemical Engineering(SKL-ChE-09A01);the State Key Laboratory of Materials-Oriented Chemical Engineering(ZK201002)

Abstract

Abstract: This paper reports on a new microporous composite silica membrane prepared via acid-catalyzed polymeric route of sol-gel method with tetraethylorthosilicate(TEOS)and a bridged silsesquioxane[1,2-bis(triethoxysilyl)ethane, BTESE]as precursors.A stable nano-sized composite silica sol with a mean volume size of~5 nm was synthesized. A 150 nm-thick defect-free composite silica membrane was deposited on disk support consisting of macroporous α-Al₂O₃ and mesoporousγ-Al₂O₃ intermediate layer by using dip-coating approach,followed by calcination under pure nitrogen atmosphere.The composite silica membranes exhibit molecular sieve properties for small gases like H₂,CO₂,O₂,N₂,CH₄ and SF₆ with hydrogen permeances in the range of(1-4)×10^-7mol·m^-2·s^-1·Pa^-1 (measured at 200℃,3.0×10⁵Pa).With respect to the membrane calcined at 500℃,it is found that the permselectivities of H₂(0.289 nm)with respect to N₂(0.365 nm),CH₄(0.384 nm)and SF₆(0.55 nm)are 22.9,42 and>1000,respectively, which are all much higher than the corresponding Knudsen values(H₂/N₂=3.7,H₂/CH₄=2.8,and H₂/SF₆=8.5).

Key words: tetraethylorthosilicate, 1,2-bis(triethoxysilyl)ethane, composite silica membranes, gas separation, molecular sieving

摘要： This paper reports on a new microporous composite silica membrane prepared via acid-catalyzed polymeric route of sol-gel method with tetraethylorthosilicate(TEOS)and a bridged silsesquioxane[1,2-bis(triethoxysilyl)ethane, BTESE]as precursors.A stable nano-sized composite silica sol with a mean volume size of 5 nm was synthesized. A 150 nm-thick defect-free composite silica membrane was deposited on disk support consisting of macroporous α-Al₂O₃ and mesoporousγ-Al₂O₃ intermediate layer by using dip-coating approach,followed by calcination under pure nitrogen atmosphere.The composite silica membranes exhibit molecular sieve properties for small gases like H₂,CO₂,O₂,N₂,CH₄ and SF₆ with hydrogen permeances in the range of(1-4)×10^-7mol·m^-2·s^-1·Pa^-1 (measured at 200℃,3.0×10⁵Pa).With respect to the membrane calcined at 500℃,it is found that the permselectivities of H₂(0.289 nm)with respect to N₂(0.365 nm),CH₄(0.384 nm)and SF₆(0.55 nm)are 22.9,42 and>1000,respectively, which are all much higher than the corresponding Knudsen values(H₂/N₂=3.7,H₂/CH₄=2.8,and H₂/SF₆=8.5).

关键词: tetraethylorthosilicate, 1,2-bis(triethoxysilyl)ethane, composite silica membranes, gas separation, molecular sieving

QI Hong. Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation[J]. , 2011, 19(3): 404-409.

漆虹. Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation[J]. , 2011, 19(3): 404-409.

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Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation

Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation

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