High-pressure hydrogen production with inherent sequestration of a pure carbon dioxide stream via fixed bed chemical looping

Robert Zacharias, Simone Visentin, Sebastian Bock, Viktor Hacker

Research output: Contribution to journalArticlepeer-review


The proof of concept for the production of pure pressurized hydrogen from hydrocarbons in combination with the sequestration of a pure stream of carbon dioxide with the reformer steam iron cycle is presented. The iron oxide based oxygen carrier (95% Fe 2 O 3 , 5% Al 2 O 3 ) is reduced with syngas and oxidized with steam at 1023 K. The carbon dioxide separation is achieved via partial reduction of the oxygen carrier from Fe 2 O 3 to Fe 3 O 4 yielding thermodynamically to a product gas only containing CO 2 and H 2 O. By the subsequent condensation of steam, pure CO 2 is sequestrated. After each steam oxidation phase, an air oxidation was applied to restore the oxygen carrier to hematite level. Product gas pressures of up to 30.1 bar and hydrogen purities exceeding 99% were achieved via steam oxidations. The main impurities in the product gas are carbon monoxide and carbon dioxide, which originate from solid carbon depositions or from stored carbonaceous molecules inside the pores of the contact mass. The oxygen carrier samples were characterized using elemental analysis, BET surface area measurement, XRD powder diffraction, SEM and light microscopy. The maximum pressure of 95 bar was demonstrated for hydrogen production in the steam oxidation phase after the full oxygen carrier reduction, significantly reducing the energy demand for compressors in mobility applications.

Original languageEnglish
Pages (from-to)7943-7957
Number of pages15
JournalInternational Journal of Hydrogen Energy
Issue number16
Publication statusPublished - 29 Mar 2019


  • Carbon capture
  • Chemical looping hydrogen
  • Fuel processing
  • High-pressure hydrogen production
  • Oxygen carrier characterization
  • Steam iron process

ASJC Scopus subject areas

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

Fields of Expertise

  • Mobility & Production


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