Model-based optimization of hydrogen generation by methane steam reforming in autothermal packed-bed membrane reformer

David S.A. Simakov, Moshe Sheintuch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

An autothermal membrane reformer comprising two separated compartments, a methane oxidation catalytic bed and a methane steam reforming bed, which hosts hydrogen separation membranes, is optimized for hydrogen production by steam reforming of methane to power a polymer electrolyte membrane fuel cell (PEMFC) stack. Capitalizing on recent experimental demonstrations of hydrogen production in such a reactor, we develop here an appropriate model, validate it with experimental data and then use it for the hydrogen generation optimization in terms of the reformer efficiency and power output. The optimized reformer, with adequate hydrogen separation area, optimized exothermic-to-endothermic feed ratio and reduced heat losses, is shown to be capable to fuel kW-range PEMFC stacks, with a methane-to-hydrogen conversion efficiency of up to 0.8. This is expected to provide an overall methane-to-electric power efficiency of a combined reformer-fuel cell unit of ~0.5. Recycling of steam reforming effluent to the oxidation bed for combustion of unreacted and unseparated compounds is expected to provide an additional efficiency gain.

Original languageEnglish
Pages (from-to)525-541
Number of pages17
JournalAICHE Journal
Volume57
Issue number2
DOIs
StatePublished - Feb 2011
Externally publishedYes

Keywords

  • Autothermal reformer
  • Fuel cells
  • Hydrogen
  • Membrane reactor
  • Methane steam reforming
  • Optimization

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