Preparation of a multi-membrane module for high-temperature hydrogen separation

Gopalakrishnan, Suraj, Nomura, Mikihiro, Sugawara, Takahashi and Nakao, Shin-ichi (2006) Preparation of a multi-membrane module for high-temperature hydrogen separation. Desalination, 193 1-3: 230-235. doi:10.1016/j.desal.2005.10.021

Author Gopalakrishnan, Suraj
Nomura, Mikihiro
Sugawara, Takahashi
Nakao, Shin-ichi
Title Preparation of a multi-membrane module for high-temperature hydrogen separation
Journal name Desalination   Check publisher's open access policy
ISSN 0011-9164
Publication date 2006-05
Sub-type Article (original research)
DOI 10.1016/j.desal.2005.10.021
Volume 193
Issue 1-3
Start page 230
End page 235
Total pages 6
Publisher Elsevier B.V.
Language eng
Subject 03 Chemical Sciences
09 Engineering
0905 Civil Engineering
Formatted abstract
Hydrogen permselective multi-membrane modules were prepared by simultaneously depositing silica using a counter-diffusion chemical vapor deposition (CVD) procedure. Mesoporous gamma-alumina layer prepared over alpha-alumina substrates were arranged inside a tubular casing and attached to the casing at either ends using glass sealing. Tetramethylorthosilicate and oxygen were allowed through either sides of the gamma-alumina layer at 873 K, which produced a deposit inside this layer thereby reducing the pore diameter. This module displayed an activated transport for hydrogen molecules while effectively filtered larger molecules like N2, CH4 and CO2. Hydrogen permeation values increased from 1.57×10−10 mol m−2 s−1 Pa−1 at 373 K to 4.38×10−8 mol m−2 s−1 Pa−1 at 873 K, with activation energy (Ea) of 22.92 kJ mol−1. The permeation values for N2, CH4 and CO2 molecules remained below 10−11 mol m−2 s−1 Pa−1, yielding a selectivity ratio with H2 of >2000, which indicates the superior quality of this module. The permeance values were also comparable with that obtained for single membranes prepared using a similar method. Hydrothermal stability of this module, when analyzed under membrane reactor conditions (H2O/N2 = 3; 76 kPa), was found to be stable for more than 15 h.
Keyword Silica membrane module
Hydrogen permselective
Counter-diffusion CVD
Hydrothermal stability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 03 May 2006, 23:41:21 EST