Synthesis of Hydrogen Permselective SiO2, TiO2, Al2O3, and B2O3 Membranes from the Chloride Precursors

Michael Tsapatsis, Soojin Kim, George Gavalas, SukWoo Nam

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

Hydrogen-permselective membranes were synthesized by chemical vapor deposition of SiO2, TiO2, Al2O3, and B2O3 layers within the pores of Vycor tubes. The deposition involved reaction of SiCl4, etc., with water at 100-800 °C depending on the chloride and the reaction geometry. Permselective SiO2 layers could be formed in either the one-sided or the two-sided (opposing reactants) geometry, while deposition of TiO2 and Al2O3 layers was achieved only in the two-sided geometry. The permeation coefficients at 450 °C were 0.3 and 0.1 cm3/(cm2·min·atm) for SiO2 membranes produced in the one-sided and two-sided geometries, respectively. The H2:N2 permeation ratios were 1000-5000. The TiO2 and Al2O3 membranes had somewhat lower permeation coefficients and H2:N2 ratios. The membranes were characterized by scanning electron microscopy (SEM) and electron microprobe analysis (EMA). A reaction mechanism is suggested involving heterogeneous reactions of chloride and water molecules with hydroxyl and chloride groups in the growing deposit layer.

Original languageEnglish
Pages (from-to)2152-2159
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Volume30
Issue number9
DOIs
Publication statusPublished - 1991 Sep 1
Externally publishedYes

Fingerprint

Chlorides
Hydrogen
Permeation
Membranes
Geometry
Permselective membranes
Water
Electron probe microanalysis
Hydroxyl Radical
Chemical vapor deposition
Deposits
Scanning electron microscopy
Molecules
boron oxide
TiO2-SiO2

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Synthesis of Hydrogen Permselective SiO2, TiO2, Al2O3, and B2O3 Membranes from the Chloride Precursors. / Tsapatsis, Michael; Kim, Soojin; Gavalas, George; Nam, SukWoo.

In: Industrial and Engineering Chemistry Research, Vol. 30, No. 9, 01.09.1991, p. 2152-2159.

Research output: Contribution to journalArticle

Tsapatsis, Michael ; Kim, Soojin ; Gavalas, George ; Nam, SukWoo. / Synthesis of Hydrogen Permselective SiO2, TiO2, Al2O3, and B2O3 Membranes from the Chloride Precursors. In: Industrial and Engineering Chemistry Research. 1991 ; Vol. 30, No. 9. pp. 2152-2159.
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