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Modeling hydrogen separation in high temperature silica membrane systems
Author(s) -
Duke M. C.,
Diniz da Costa J. C.,
Lu G. Q.,
Gray P. G.
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10777
Subject(s) - membrane , permeation , molecular sieve , hydrogen , chemical engineering , chemistry , electrolyte , adsorption , gas separation , arrhenius equation , work (physics) , chromatography , thermodynamics , organic chemistry , electrode , engineering , biochemistry , activation energy , physics
In this work, a working model is proposed of molecular sieve silica (MSS) multistage membrane systems for CO cleanup at high temperatures (up to 500°C) in a simulated fuel cell fuel processing system. Gases are described as having little interactions with each other relative to the pore walls due to low isosteric heat of adsorption on silica surfaces and high temperatures. The Arrhenius function for activated transport of pure gases was used to predict mixture concentration in the permeate and retentate streams. Simulation predicted CO could be reduced to levels below the required 50 ppmv for polymer electrolyte membrane fuel cell anodes at a stage H 2 /CO selectivity of higher than 40 in 4 series membrane units. Experimental validation showed predicting mixture concentrations required only pure gas permeation data. This model has significant application for setting industrial “stretch targets” and as a robust basis for complex membrane model configurations. © 2006 American Institute of Chemical Engineers AIChE J, 2006