Reverse water gas shift by chemical looping with iron-substituted hexaaluminate catalysts

Natalie Utsis, Miron V. Landau, Alexander Erenburg, Moti Herskowitz

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The Fe-substituted Ba-hexaaluminates (BaFeHAl) are active catalysts for reverse water-gas shift (RWGS) reaction conducted in chemical looping mode. Increasing of the degree of substitution of Al3+ for Fe3+ ions in co-precipitated BaHAl from 60% (BaFeHAl) to 100% (BaFe-hexaferrite, BaFeHF), growing its surface area from 5 to 30 m2/g, and promotion with potassium increased the CO capacity in isothermal RWGS-CL runs at 350–450C, where the hexaaluminate/hexaferrite structure is stable. Increasing H2-reduction temperature converts BaFeHAl to a thermally stable BaFeHF modification that contains additional Ba-O-Fe bridges in its structure, reinforcing the connection between alternatively stacked spinel blocks. This material displayed the highest CO capacity of 400 µmol/g at isothermal RWGS-CL run conducted at 550C due to increased concentration of oxygen vacancies reflected by greater surface Fe2+/Fe3+ ratio detected by XPS. The results demonstrate direct connection between CO capacity measured in RWGS-CL experiments and calculated CO2 conversion.

Original languageEnglish
Article number1082
Pages (from-to)1-18
Number of pages18
JournalCatalysts
Volume10
Issue number9
DOIs
StatePublished - 1 Sep 2020

Keywords

  • Carbon dioxide
  • Carbon oxide
  • Chemical looping
  • Hexaaluminate
  • Iron
  • Reverse water gas shift

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