Efficiency of hydrogen recovery from reformate with a polymer electrolyte hydrogen pump

Ahmed Abdulla, Kathryn Laney, Miriam Padilla, Sankaran Sundaresan, Jay Burton Benziger

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

The energy efficiency of hydrogen recovery from mixtures of CO2, H2O, and H2 by a polymer electrolyte hydrogen pump (PEHP) has been evaluated. The PEHP pumps protons across the polymer electrolyte, producing >99.99% pure H2 and a concentrated CO2 stream. Single stage PEHP experiments recovered 65% of the hydrogen with an energy efficiency of 50%. The energy efficiency is limited by hydrogen mass transport across the porous gas diffusion electrode. The mass transport resistance for hydrogen increases as H2 is depleted from the CO2/H2 mixture by the PEHP. Analysis shows that a multistage PEHP with fixed applied potential difference can recover >90% of the hydrogen with an energy efficiency of 75%, whereas a novel multistage PEHP design with a programmed voltage profile can achieve >90% energy efficiency with >98% hydrogen recovery.

Original languageEnglish (US)
Pages (from-to)1767-1779
Number of pages13
JournalAIChE Journal
Volume57
Issue number7
DOIs
StatePublished - Jul 1 2011

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Keywords

  • Carbon dioxide removal
  • Electrochemical separations
  • Hydrogen
  • Reformate purification

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