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

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doi:10.1016/S1004-9541(09)60228-7

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

Updated：2026-01-06

- Preparation of Composite Microporous Silica Membranes Using TEOS and 1,2-Bis(triethoxysilyl)ethane as Precursors for Gas Separation
- Chinese Journal of Chemical Engineering Vol. 19, Issue 3, Pages: 404-409(2011)
- Affiliations：
  
  Membrane Science and Technology Research Center, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology,Nanjing,China,210009
- Author bio：
- Funds：
- DOI：10.1016/S1004-9541(09)60228-7
  CLC：
- Published：2011
- Accepted：
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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.
DOI：

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. DOI： 10.1016/S1004-9541(09)60228-7.

摘要

This paper reports on a new microporous comp

osite 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-Al

and mesoporousγ-Al

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 H

and SF

with hydrogen permeances in the range of(1-4)×10

-7

mol·m

-2

·s

-1

·Pa

-1

(measured at 200℃

3.0×10

Pa).With respect to the membrane calcined at 500℃

it is found that the permselectivities of H

(0.289 nm)with respect to N

(0.365 nm)

(0.384 nm)and SF

(0.55 nm)are 22.9

42 and1000

respectively

which are all much higher than the corresponding Knudsen values(H

=3.7

/CH

=2.8

and H

/SF

=8.5).

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-Al

and mesoporousγ-Al

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 H

and SF

with hydrogen permeances in the range of(1-4)×10

-7

mol·m

-2

·s

-1

·Pa

-1

(measured at 200℃

3.0×10

Pa).With respect to the membrane calcined at 500℃

it is found that the permselectivities of H

(0.289 nm)with respect to N

(0.365 nm)

(0.384 nm)and SF

(0.55 nm)are 22.9

42 and1000

respectively

which are all much higher than the corresponding Knudsen values(H

=3.7

/CH

=2.8

and H

/SF

=8.5).

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