Influence of the intermediate layer on the hydrothermal stability of sol-gel derived hybrid silica membranes

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Abstract

The hydrothermal stability of microporous silica hybrid sol-gel derived membranes is often only tested for either the mesoporous intermediate membrane layer or the microporous separation layer. In this work an investigation is done on the interaction between the intermediate γ-alumina layer and the hybrid (BTESE-derived) silica separation layer during hydrothermal treatment. Although bare γ-alumina is degraded during a hydrothermal treatment, a coating of hydrophobic BTESE on γ-alumina retains its gas separation performance, albeit with a lower mechanical adhesion between the hybrid silica separation layer and the γ-alumina intermediate layer. Applying a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer stabilizes the γ-alumina membrane. A BTESE coating on a MAP modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a significant increase in the H2/N2 (perm)selectivity, factor 3, was observed for these membranes.

Original languageEnglish
Pages (from-to)3435-3441
Number of pages7
JournalJournal of the European Ceramic Society
Volume37
Issue number10
DOIs
Publication statusPublished - 1 Aug 2017

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Aluminum Oxide
Silicon Dioxide
Sol-gels
Alumina
Silica
Membranes
Coatings
Delamination
Adhesion
Gases
Testing

Keywords

  • Gas separation
  • Hybrid silica
  • Hydrothermal stability
  • Microporous membrane
  • Monoaluminumphosphate coating

Cite this

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title = "Influence of the intermediate layer on the hydrothermal stability of sol-gel derived hybrid silica membranes",
abstract = "The hydrothermal stability of microporous silica hybrid sol-gel derived membranes is often only tested for either the mesoporous intermediate membrane layer or the microporous separation layer. In this work an investigation is done on the interaction between the intermediate γ-alumina layer and the hybrid (BTESE-derived) silica separation layer during hydrothermal treatment. Although bare γ-alumina is degraded during a hydrothermal treatment, a coating of hydrophobic BTESE on γ-alumina retains its gas separation performance, albeit with a lower mechanical adhesion between the hybrid silica separation layer and the γ-alumina intermediate layer. Applying a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer stabilizes the γ-alumina membrane. A BTESE coating on a MAP modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a significant increase in the H2/N2 (perm)selectivity, factor 3, was observed for these membranes.",
keywords = "Gas separation, Hybrid silica, Hydrothermal stability, Microporous membrane, Monoaluminumphosphate coating",
author = "{ten Hove}, Marcel and Luiten-Olieman, {Mieke W.J.} and Cindy Huiskes and Arian Nijmeijer and Louis Winnubst",
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T1 - Influence of the intermediate layer on the hydrothermal stability of sol-gel derived hybrid silica membranes

AU - ten Hove, Marcel

AU - Luiten-Olieman, Mieke W.J.

AU - Huiskes, Cindy

AU - Nijmeijer, Arian

AU - Winnubst, Louis

PY - 2017/8/1

Y1 - 2017/8/1

N2 - The hydrothermal stability of microporous silica hybrid sol-gel derived membranes is often only tested for either the mesoporous intermediate membrane layer or the microporous separation layer. In this work an investigation is done on the interaction between the intermediate γ-alumina layer and the hybrid (BTESE-derived) silica separation layer during hydrothermal treatment. Although bare γ-alumina is degraded during a hydrothermal treatment, a coating of hydrophobic BTESE on γ-alumina retains its gas separation performance, albeit with a lower mechanical adhesion between the hybrid silica separation layer and the γ-alumina intermediate layer. Applying a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer stabilizes the γ-alumina membrane. A BTESE coating on a MAP modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a significant increase in the H2/N2 (perm)selectivity, factor 3, was observed for these membranes.

AB - The hydrothermal stability of microporous silica hybrid sol-gel derived membranes is often only tested for either the mesoporous intermediate membrane layer or the microporous separation layer. In this work an investigation is done on the interaction between the intermediate γ-alumina layer and the hybrid (BTESE-derived) silica separation layer during hydrothermal treatment. Although bare γ-alumina is degraded during a hydrothermal treatment, a coating of hydrophobic BTESE on γ-alumina retains its gas separation performance, albeit with a lower mechanical adhesion between the hybrid silica separation layer and the γ-alumina intermediate layer. Applying a monoaluminumphosphate (MAP) coating between the α-alumina support and the γ-alumina layer stabilizes the γ-alumina membrane. A BTESE coating on a MAP modified γ-alumina membrane did not show any signs of delamination after hydrothermal testing. Moreover, a significant increase in the H2/N2 (perm)selectivity, factor 3, was observed for these membranes.

KW - Gas separation

KW - Hybrid silica

KW - Hydrothermal stability

KW - Microporous membrane

KW - Monoaluminumphosphate coating

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