The effect of mixture gas on hydrogen permeation through a palladium membrane: Experimental study and theoretical approach

F. Gallucci, F. Chiaravalloti, S. Tosti, E. Drioli, A. Basile

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Abstract

Hydrogen permeation through a palladium membrane has been measured in the presence of several gases, such as CO, N2, CO2, and Ar, both in the feed side and in the shell side of the (membrane) module. It has been found that CO molecules, remarkably inhibit hydrogen permeation. In particular, in the presence of carbon monoxide the permeation decreases with two different slopes: (I) for low CO concentrations, the hydrogen permeation decreases quickly (surface effects), whereas (II) for higher ones it decreases smoothly (dilute effect). Permeation of hydrogen, in the presence of the other gases, i.e. N2, CO2and Ar, always decreases with the same slope (dilute effect). In order to describe the CO inhibition, a theoretical investigation has been proposed. In particular, the framework of the Density Functional Theory has been used. CO and N2Density Functional full optimisations on palladium clusters show that CO and N2molecules present two minima on the cluster surfaces with bond lengths of 2.0 and 3.8 Å, respectively. The CO minima are much stable than N2minima, resulting in a surface effect on the hydrogen permeation through the membrane. © 2006 International Association for Hydrogen Energy.
Original languageEnglish
Pages (from-to)1837 - 1845
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume32
Issue number12
DOIs
Publication statusPublished - Aug 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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