Study of a dense metal membrane reactor for hydrogen separation from hydroiodic acid decomposition

Silvano Tosti, Rodolfo Borelli, Fabio Borgognoni, Paolo Favuzza, Claudio Rizzello, Pietro Tarquini

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A membrane reactor has been studied for separating the hydrogen produced by the dissociation of hydroiodic acid in the thermochemical-sulfur iodine process. A dense metal membrane tube of wall thickness 0.250 mm has been considered in this analysis for hosting a fixed-bed catalyst: the selective separation of hydrogen from an azeotropic H2O-HI mixture has been studied in the temperature range of 700-800 K. The materials being considered for the construction of the membrane tube are niobium and tantalum; as a matter of fact, the most commonly used Pd-Ag membranes cannot withstand the corrosive environment generated by the hydroiodic acid. The Damkohler-Peclet analysis has been used for designing the membrane reactor, while a finite element method has simulated its behaviour: the effect of the temperature and pressure on the HI conversion and hydrogen yield has been evaluated. © 2008 International Association for Hydrogen Energy.
Original languageEnglish
Pages (from-to)5106 - 5114
Number of pages9
JournalInternational Journal of Hydrogen Energy
Issue number19
Publication statusPublished - Oct 2008
Externally publishedYes


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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