Separation characteristics of tetrapropylammoniumbromide templating silica/alumina composite membrane in CO2/N2, CO 2/H2 and CH4/H2 systems

Jong Ho Moon; Hyungwoong Ahn; Sang Hoon Hyun; Chang Ha Lee

doi:10.1007/BF02705438

Separation characteristics of tetrapropylammoniumbromide templating silica/alumina composite membrane in CO₂/N₂, CO ₂/H₂ and CH₄/H₂ systems

Jong Ho Moon, Hyungwoong Ahn, Sang Hoon Hyun, Chang Ha Lee

Department of Chemical and Biomolecular Engineering

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

21 Citations (Scopus)

Abstract

Nanoporous silica membrane without any pinholes and cracks was synthesized by organic templating method. The tetrapropylammoniumbromide (TPABr)-templating silica sols were coated on tubular alumina composite support (γ-Al ₂O₃/α-Al₂O₃ composite) by dip coating and then heat-treated at 550°C. By using the prepared TPABr templating silica/alumina composite membrane, adsorption and membrane transport experiments were performed on the CO₂/N₂, CO ₂/H₂ and CH₄/H₂ systems. Adsorption and permeation by using single gas and binary mixtures were measured in order to examine the transport mechanism in the membrane. In the single gas systems, adsorption characteristics on the α-Al₂O₃ support and nanoporous unsupport (TPABr templating SiO₂/γ-Al ₂O₃ composite layer without α-Al₂O ₃ support) were investigated at 20-40°C conditions and 0.0-1.0 atm pressure range. The experimental adsorption equilibrium was well fitted with Langmuir or/and Langmuir-Freundlich isotherm models. The α-Al ₂O₃ support had a little adsorption capacity compared to the unsupport which had relatively larger adsorption capacity for CO ₂ and CH₄. While the adsorption rates in the unsupport showed in the order of H₂>CO₂2>N ₂>CH₄ at low pressure range, the permeate flux in the membrane was in the order of H₂≫N₂>CH ₄>CO₂. Separation properties of the unsupport could be confirmed by the separation experiments of adsorbable/non-adsorbable mixed gases, such as CO₂/H₂ and CH₄/H₂ systems. Although light and non-adsorbable molecules, such as H₂, showed the highest permeation in the single gas permeate experiments, heavier and strongly adsorbable molecules, such as CO₂and CH₄, showed a higher separation factor (CO₂/H₂=5-7, CH ₄/H₂=4-9). These results might be caused by the surface diffusion or/and blocking effects of adsorbed molecules in the unsupport. And these results could be explained by surface diffusion.

Original language	English
Pages (from-to)	477-487
Number of pages	11
Journal	Korean Journal of Chemical Engineering
Volume	21
Issue number	2
DOIs	https://doi.org/10.1007/BF02705438
Publication status	Published - 2004 Mar

Bibliographical note

Funding Information:
The financial support of KOSEF (Korea Science and Engineering Foundation, R01-1999-000-00198-0) is gratefully acknowledged.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)

Access to Document

10.1007/BF02705438

Cite this

@article{5aa94383e97942a0816e630c2768e6c6,

title = "Separation characteristics of tetrapropylammoniumbromide templating silica/alumina composite membrane in CO2/N2, CO 2/H2 and CH4/H2 systems",

abstract = "Nanoporous silica membrane without any pinholes and cracks was synthesized by organic templating method. The tetrapropylammoniumbromide (TPABr)-templating silica sols were coated on tubular alumina composite support (γ-Al 2O3/α-Al2O3 composite) by dip coating and then heat-treated at 550°C. By using the prepared TPABr templating silica/alumina composite membrane, adsorption and membrane transport experiments were performed on the CO2/N2, CO 2/H2 and CH4/H2 systems. Adsorption and permeation by using single gas and binary mixtures were measured in order to examine the transport mechanism in the membrane. In the single gas systems, adsorption characteristics on the α-Al2O3 support and nanoporous unsupport (TPABr templating SiO2/γ-Al 2O3 composite layer without α-Al2O 3 support) were investigated at 20-40°C conditions and 0.0-1.0 atm pressure range. The experimental adsorption equilibrium was well fitted with Langmuir or/and Langmuir-Freundlich isotherm models. The α-Al 2O3 support had a little adsorption capacity compared to the unsupport which had relatively larger adsorption capacity for CO 2 and CH4. While the adsorption rates in the unsupport showed in the order of H2>CO22>N 2>CH4 at low pressure range, the permeate flux in the membrane was in the order of H2≫N2>CH 4>CO2. Separation properties of the unsupport could be confirmed by the separation experiments of adsorbable/non-adsorbable mixed gases, such as CO2/H2 and CH4/H2 systems. Although light and non-adsorbable molecules, such as H2, showed the highest permeation in the single gas permeate experiments, heavier and strongly adsorbable molecules, such as CO2and CH4, showed a higher separation factor (CO2/H2=5-7, CH 4/H2=4-9). These results might be caused by the surface diffusion or/and blocking effects of adsorbed molecules in the unsupport. And these results could be explained by surface diffusion.",

author = "Moon, {Jong Ho} and Hyungwoong Ahn and Hyun, {Sang Hoon} and Lee, {Chang Ha}",

note = "Funding Information: The financial support of KOSEF (Korea Science and Engineering Foundation, R01-1999-000-00198-0) is gratefully acknowledged.",

year = "2004",

month = mar,

doi = "10.1007/BF02705438",

language = "English",

volume = "21",

pages = "477--487",

journal = "Korean Journal of Chemical Engineering",

issn = "0256-1115",

publisher = "Springer New York",

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T1 - Separation characteristics of tetrapropylammoniumbromide templating silica/alumina composite membrane in CO2/N2, CO 2/H2 and CH4/H2 systems

AU - Moon, Jong Ho

AU - Ahn, Hyungwoong

AU - Hyun, Sang Hoon

AU - Lee, Chang Ha

N1 - Funding Information: The financial support of KOSEF (Korea Science and Engineering Foundation, R01-1999-000-00198-0) is gratefully acknowledged.

PY - 2004/3

Y1 - 2004/3

N2 - Nanoporous silica membrane without any pinholes and cracks was synthesized by organic templating method. The tetrapropylammoniumbromide (TPABr)-templating silica sols were coated on tubular alumina composite support (γ-Al 2O3/α-Al2O3 composite) by dip coating and then heat-treated at 550°C. By using the prepared TPABr templating silica/alumina composite membrane, adsorption and membrane transport experiments were performed on the CO2/N2, CO 2/H2 and CH4/H2 systems. Adsorption and permeation by using single gas and binary mixtures were measured in order to examine the transport mechanism in the membrane. In the single gas systems, adsorption characteristics on the α-Al2O3 support and nanoporous unsupport (TPABr templating SiO2/γ-Al 2O3 composite layer without α-Al2O 3 support) were investigated at 20-40°C conditions and 0.0-1.0 atm pressure range. The experimental adsorption equilibrium was well fitted with Langmuir or/and Langmuir-Freundlich isotherm models. The α-Al 2O3 support had a little adsorption capacity compared to the unsupport which had relatively larger adsorption capacity for CO 2 and CH4. While the adsorption rates in the unsupport showed in the order of H2>CO22>N 2>CH4 at low pressure range, the permeate flux in the membrane was in the order of H2≫N2>CH 4>CO2. Separation properties of the unsupport could be confirmed by the separation experiments of adsorbable/non-adsorbable mixed gases, such as CO2/H2 and CH4/H2 systems. Although light and non-adsorbable molecules, such as H2, showed the highest permeation in the single gas permeate experiments, heavier and strongly adsorbable molecules, such as CO2and CH4, showed a higher separation factor (CO2/H2=5-7, CH 4/H2=4-9). These results might be caused by the surface diffusion or/and blocking effects of adsorbed molecules in the unsupport. And these results could be explained by surface diffusion.

AB - Nanoporous silica membrane without any pinholes and cracks was synthesized by organic templating method. The tetrapropylammoniumbromide (TPABr)-templating silica sols were coated on tubular alumina composite support (γ-Al 2O3/α-Al2O3 composite) by dip coating and then heat-treated at 550°C. By using the prepared TPABr templating silica/alumina composite membrane, adsorption and membrane transport experiments were performed on the CO2/N2, CO 2/H2 and CH4/H2 systems. Adsorption and permeation by using single gas and binary mixtures were measured in order to examine the transport mechanism in the membrane. In the single gas systems, adsorption characteristics on the α-Al2O3 support and nanoporous unsupport (TPABr templating SiO2/γ-Al 2O3 composite layer without α-Al2O 3 support) were investigated at 20-40°C conditions and 0.0-1.0 atm pressure range. The experimental adsorption equilibrium was well fitted with Langmuir or/and Langmuir-Freundlich isotherm models. The α-Al 2O3 support had a little adsorption capacity compared to the unsupport which had relatively larger adsorption capacity for CO 2 and CH4. While the adsorption rates in the unsupport showed in the order of H2>CO22>N 2>CH4 at low pressure range, the permeate flux in the membrane was in the order of H2≫N2>CH 4>CO2. Separation properties of the unsupport could be confirmed by the separation experiments of adsorbable/non-adsorbable mixed gases, such as CO2/H2 and CH4/H2 systems. Although light and non-adsorbable molecules, such as H2, showed the highest permeation in the single gas permeate experiments, heavier and strongly adsorbable molecules, such as CO2and CH4, showed a higher separation factor (CO2/H2=5-7, CH 4/H2=4-9). These results might be caused by the surface diffusion or/and blocking effects of adsorbed molecules in the unsupport. And these results could be explained by surface diffusion.

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