Using in-situ techniques to probe high-temperature reactions: Thermochemical cycles for the production of synthetic fuels from CO2 and water

Eric N. Coker, Mark A. Rodriguez, Andrea Ambrosini, James E. Miller, Ellen Stechel

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Ferrites are promising materials for enabling solar-thermochemical cycles. Such cycles utilize solar-thermal energy to reduce the metal oxide, which is then re-oxidized by H2O or CO2, producing H2 or CO, respectively. Mixing ferrites with zirconia or yttria-stabilized zirconia (YSZ) greatly improves their cyclabilities. In order to understand this system, we have studied the behavior of iron oxide/8YSZ (8 mol-% Y2O3 in ZrO2) using in situ X-ray diffraction and thermogravimetric analyses at temperatures up to 1500 °C and under controlled atmosphere. The solubility of iron oxide in 8YSZ measured by XRD at room temperature was 9.4 mol-% Fe. The solubility increased to at least 10.4 mol-% Fe when heated between 800 and 1000 °C under inert atmosphere. Furthermore iron was found to migrate in and out of the 8YSZ phase as the temperature and oxidation state of the iron changed. In samples containing >9.4 mol-% Fe, stepwise heating to 1400 °C under helium caused reduction of Fe2O3 to Fe3O4 to FeO. Exposure of the FeO-containing material to CO2 at 1100 °C re-oxidized FeO to Fe3O4 with evolution of CO. Thermogravimetric analysis during thermochemical cycling of materials with a range of iron contents showed that samples with mostly dissolved iron utilized a greater proportion of the iron atoms present than did samples possessing a greater fraction of un-dissolved iron oxides.

Original languageEnglish
Pages (from-to)117-125
Number of pages9
JournalPowder Diffraction
Volume27
Issue number2
DOIs
Publication statusPublished - Jun 2012

Fingerprint

synthetic fuels
Synthetic fuels
Iron
iron
cycles
Iron oxides
iron oxides
Water
probes
water
Ferrites
Carbon Monoxide
ferrites
solubility
Temperature
Solubility
controlled atmospheres
Helium
inert atmosphere
Yttria stabilized zirconia

Keywords

  • ferrite
  • in situ high-temperature XRD
  • synthetic fuel
  • TGA
  • yttria-stabilized zirconia

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Instrumentation
  • Radiation

Cite this

Using in-situ techniques to probe high-temperature reactions : Thermochemical cycles for the production of synthetic fuels from CO2 and water. / Coker, Eric N.; Rodriguez, Mark A.; Ambrosini, Andrea; Miller, James E.; Stechel, Ellen.

In: Powder Diffraction, Vol. 27, No. 2, 06.2012, p. 117-125.

Research output: Contribution to journalArticle

Coker, Eric N. ; Rodriguez, Mark A. ; Ambrosini, Andrea ; Miller, James E. ; Stechel, Ellen. / Using in-situ techniques to probe high-temperature reactions : Thermochemical cycles for the production of synthetic fuels from CO2 and water. In: Powder Diffraction. 2012 ; Vol. 27, No. 2. pp. 117-125.
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