Hydrogen separation of methyltriethoxysilane templating silica membrane

Jong Ho Moon, Chang-Ha Lee

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Hydrogen separation on microporous methyltriethoxysilane-templating silica composite/α-alumina membranes (below MTES membrane) was studied using three binary gas mixtures: H2/N2, H2/CO 2, and H2/CH4. The characteristics of unsteady and steady-state permeation/separation on the MTES membrane were compared to each other. Although permeation flux in the H2/N2 mixture was comparatively low, H2 selectivity was high (H2/N 2 SF ≈ 30-60). On the contrary, the H2/CO2 mixture showed high permeation flux but low H2 selectivity (H 2/CO2 SF ≈ 1.5-6.5). The H2/CH4 mixture showed a large difference between permselectivity (28-48) and separation factor (10-22). Results from this study revealed that it was difficult to predict the separation factor using the one-component permeation ratio (permselectivity) over the experimental range tested. These separation characteristics could be primarily ascribed to the molecular size and structure of each gas, which likely contributed to steric hindrance or molecular sieving within the membrane pore. In addition, the adsorption affinity of each molecule on the membrane surface acted as a key factor in separation performance because it significantly influenced surface diffusion. The generalized Maxwell-Stefan model incorporating the dust gas model, and the Langmuir model could successfully predict the transient and steady-state permeation/separation.

Original languageEnglish
Pages (from-to)3125-3136
Number of pages12
JournalAICHE Journal
Volume53
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1

Fingerprint

Silicon Dioxide
Hydrogen
Silica
Permeation
Membranes
Gases
Aluminum Oxide
Carbon Monoxide
Molecular Structure
Dust
Fluxes
Adsorption
Surface diffusion
Binary mixtures
Gas mixtures
Alumina
Molecules
Composite materials

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Cite this

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abstract = "Hydrogen separation on microporous methyltriethoxysilane-templating silica composite/α-alumina membranes (below MTES membrane) was studied using three binary gas mixtures: H2/N2, H2/CO 2, and H2/CH4. The characteristics of unsteady and steady-state permeation/separation on the MTES membrane were compared to each other. Although permeation flux in the H2/N2 mixture was comparatively low, H2 selectivity was high (H2/N 2 SF ≈ 30-60). On the contrary, the H2/CO2 mixture showed high permeation flux but low H2 selectivity (H 2/CO2 SF ≈ 1.5-6.5). The H2/CH4 mixture showed a large difference between permselectivity (28-48) and separation factor (10-22). Results from this study revealed that it was difficult to predict the separation factor using the one-component permeation ratio (permselectivity) over the experimental range tested. These separation characteristics could be primarily ascribed to the molecular size and structure of each gas, which likely contributed to steric hindrance or molecular sieving within the membrane pore. In addition, the adsorption affinity of each molecule on the membrane surface acted as a key factor in separation performance because it significantly influenced surface diffusion. The generalized Maxwell-Stefan model incorporating the dust gas model, and the Langmuir model could successfully predict the transient and steady-state permeation/separation.",
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Hydrogen separation of methyltriethoxysilane templating silica membrane. / Moon, Jong Ho; Lee, Chang-Ha.

In: AICHE Journal, Vol. 53, No. 12, 01.12.2007, p. 3125-3136.

Research output: Contribution to journalArticle

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AB - Hydrogen separation on microporous methyltriethoxysilane-templating silica composite/α-alumina membranes (below MTES membrane) was studied using three binary gas mixtures: H2/N2, H2/CO 2, and H2/CH4. The characteristics of unsteady and steady-state permeation/separation on the MTES membrane were compared to each other. Although permeation flux in the H2/N2 mixture was comparatively low, H2 selectivity was high (H2/N 2 SF ≈ 30-60). On the contrary, the H2/CO2 mixture showed high permeation flux but low H2 selectivity (H 2/CO2 SF ≈ 1.5-6.5). The H2/CH4 mixture showed a large difference between permselectivity (28-48) and separation factor (10-22). Results from this study revealed that it was difficult to predict the separation factor using the one-component permeation ratio (permselectivity) over the experimental range tested. These separation characteristics could be primarily ascribed to the molecular size and structure of each gas, which likely contributed to steric hindrance or molecular sieving within the membrane pore. In addition, the adsorption affinity of each molecule on the membrane surface acted as a key factor in separation performance because it significantly influenced surface diffusion. The generalized Maxwell-Stefan model incorporating the dust gas model, and the Langmuir model could successfully predict the transient and steady-state permeation/separation.

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