Organic-templating approach to synthesis of nanoporous silica composite membranes (II): MTES-templating and CO2 separation

Y. E. Lee; B. S. Kang; S. H. Hyun; C. H. Lee

doi:10.1081/SS-200036750

Organic-templating approach to synthesis of nanoporous silica composite membranes (II): MTES-templating and CO₂ separation

Y. E. Lee, B. S. Kang, S. H. Hyun, C. H. Lee

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Nanoporous silica composite membranes for gas separation have been synthesized by the organic-templating sol-gel technique and their CO ₂/N₂ separation efficiency has been investigated. Stable organic-templating silica sols capable of coating nanoporous amorphous silica layers on SiO₂/α-Al₂O₃ composite supports were prepared by the two-step acid-catalytic process using the mixture of TEOS and template such as MTES (methyltriethoxysilane) being covalently bonded with TEOS or TPABr (tetrapropylammonium bromide) non-reacted. The SiO ₂/α-Al₂O₃ composite supports (pore size 1.6nm) prepared by pressurized coating of the porous α-alumina tube with a nanoparticulate silica sol were found to be more suitable than pure α-Al₂O₃ composite supports for synthesizing crack-free membranes which have the high CO₂/N₂ separation efficiency. The N₂ permeability of organic-templated silica composite membranes synthesized was about 10^-8mol/m ²·s·Pa and the CO₂/N₂ separation factor of the MTES-templated silica composite membranes was enhanced up to 19 at room temperature by surface-modifying the templated silica membrane with the TEOS-EtOH solution.

Original language	English
Pages (from-to)	3541-3557
Number of pages	17
Journal	Separation Science and Technology
Volume	39
Issue number	15
DOIs	https://doi.org/10.1081/SS-200036750
Publication status	Published - 2004

Bibliographical note

Funding Information:
This work was supported by grant No. R01-1999-000-00198-0 from the Basic Research Program of the Korea Science & Engineering Foundation.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Process Chemistry and Technology
Filtration and Separation

Access to Document

10.1081/SS-200036750

Cite this

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title = "Organic-templating approach to synthesis of nanoporous silica composite membranes (II): MTES-templating and CO2 separation",

abstract = "Nanoporous silica composite membranes for gas separation have been synthesized by the organic-templating sol-gel technique and their CO 2/N2 separation efficiency has been investigated. Stable organic-templating silica sols capable of coating nanoporous amorphous silica layers on SiO2/α-Al2O3 composite supports were prepared by the two-step acid-catalytic process using the mixture of TEOS and template such as MTES (methyltriethoxysilane) being covalently bonded with TEOS or TPABr (tetrapropylammonium bromide) non-reacted. The SiO 2/α-Al2O3 composite supports (pore size 1.6nm) prepared by pressurized coating of the porous α-alumina tube with a nanoparticulate silica sol were found to be more suitable than pure α-Al2O3 composite supports for synthesizing crack-free membranes which have the high CO2/N2 separation efficiency. The N2 permeability of organic-templated silica composite membranes synthesized was about 10-8mol/m 2·s·Pa and the CO2/N2 separation factor of the MTES-templated silica composite membranes was enhanced up to 19 at room temperature by surface-modifying the templated silica membrane with the TEOS-EtOH solution.",

author = "Lee, {Y. E.} and Kang, {B. S.} and Hyun, {S. H.} and Lee, {C. H.}",

note = "Funding Information: This work was supported by grant No. R01-1999-000-00198-0 from the Basic Research Program of the Korea Science & Engineering Foundation.",

year = "2004",

doi = "10.1081/SS-200036750",

language = "English",

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T2 - MTES-templating and CO2 separation

AU - Lee, Y. E.

AU - Kang, B. S.

AU - Hyun, S. H.

AU - Lee, C. H.

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PY - 2004

Y1 - 2004

N2 - Nanoporous silica composite membranes for gas separation have been synthesized by the organic-templating sol-gel technique and their CO 2/N2 separation efficiency has been investigated. Stable organic-templating silica sols capable of coating nanoporous amorphous silica layers on SiO2/α-Al2O3 composite supports were prepared by the two-step acid-catalytic process using the mixture of TEOS and template such as MTES (methyltriethoxysilane) being covalently bonded with TEOS or TPABr (tetrapropylammonium bromide) non-reacted. The SiO 2/α-Al2O3 composite supports (pore size 1.6nm) prepared by pressurized coating of the porous α-alumina tube with a nanoparticulate silica sol were found to be more suitable than pure α-Al2O3 composite supports for synthesizing crack-free membranes which have the high CO2/N2 separation efficiency. The N2 permeability of organic-templated silica composite membranes synthesized was about 10-8mol/m 2·s·Pa and the CO2/N2 separation factor of the MTES-templated silica composite membranes was enhanced up to 19 at room temperature by surface-modifying the templated silica membrane with the TEOS-EtOH solution.

AB - Nanoporous silica composite membranes for gas separation have been synthesized by the organic-templating sol-gel technique and their CO 2/N2 separation efficiency has been investigated. Stable organic-templating silica sols capable of coating nanoporous amorphous silica layers on SiO2/α-Al2O3 composite supports were prepared by the two-step acid-catalytic process using the mixture of TEOS and template such as MTES (methyltriethoxysilane) being covalently bonded with TEOS or TPABr (tetrapropylammonium bromide) non-reacted. The SiO 2/α-Al2O3 composite supports (pore size 1.6nm) prepared by pressurized coating of the porous α-alumina tube with a nanoparticulate silica sol were found to be more suitable than pure α-Al2O3 composite supports for synthesizing crack-free membranes which have the high CO2/N2 separation efficiency. The N2 permeability of organic-templated silica composite membranes synthesized was about 10-8mol/m 2·s·Pa and the CO2/N2 separation factor of the MTES-templated silica composite membranes was enhanced up to 19 at room temperature by surface-modifying the templated silica membrane with the TEOS-EtOH solution.

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