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Investigations of the Regeneration Step of a Thermochemical Cycle using Mixed Iron Oxides Coated on SiC Substrates

Neises, Martina and Simon, Heike and Roeb, Martin and Schmücker, Martin and Sattler, Christian and Pitz-Paal, Robert (2011) Investigations of the Regeneration Step of a Thermochemical Cycle using Mixed Iron Oxides Coated on SiC Substrates. In: ASME 5th International Conference on Energy Sustainability. ASME 5th International Conference on Energy Sustainability, 7.-10. Aug. 2011, Washington DC, USA.

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Abstract

A two-step thermochemical cycle for hydrogen production using mixed iron oxides coated on silicon carbide substrates has been investigated. The water-splitting step proceeds at temperatures between 800 and 1000 °C while for the regeneration step temperatures around 1200 °C are needed. A deactivation of the material resulting in a decrease of the hydrogen production within the first couple of cycles was observed in preceding tests. For detailed investigations of the system composed of the redox-material and the substrate small scale samples were tested in a laboratory test-rig. For identification of material changes the samples were investigated via XRD and SEM-EDS analysis. The analysis revealed the reasons for the deactivation of the redox-material. Through parametric studies the influence of the regeneration parameters, namely regeneration temperature and time on the hydrogen production was analysed. A model for the regeneration step was developed describing the performance of the regeneration step as a function of temperature and time and additionally as a function of total regeneration time, i.e. the cumulated time the sample has been regenerated.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Investigations of the Regeneration Step of a Thermochemical Cycle using Mixed Iron Oxides Coated on SiC Substrates
Authors:
AuthorsInstitution or Email of Authors
Neises, Martinamartina.neises@dlr.de
Simon, Heikeheike.simon@dlr.de
Roeb, Martinmartin.roeb@dlr.de
Schmücker, Martinmartin.schmuecker@dlr.de
Sattler, Christianchristian.sattler@dlr.de
Pitz-Paal, Robertrobert.pitz-paal@dlr.de
Date:9 August 2011
Journal or Publication Title:ASME 5th International Conference on Energy Sustainability
Refereed publication:Yes
In ISI Web of Science:Yes
Editors:
EditorsEmail
Walker, AndyNREL
Status:Published
Keywords:thermochemical cycle, water splitting, hydrogen, ferrite
Event Title:ASME 5th International Conference on Energy Sustainability
Event Location:Washington DC, USA
Event Type:international Conference
Event Dates:7.-10. Aug. 2011
Organizer:American Society of Mechanical Engineers
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research
Institute of Materials Research
Deposited By: Dr.rer.nat. Christian Sattler
Deposited On:29 Aug 2011 11:49
Last Modified:29 Aug 2011 11:49

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