Performance of Reverse Water Gas Shift on Coprecipitated and C-Templated BaFe-Hexaaluminate: The Effect of Fe Loading, Texture, and Promotion with K

Natalie Utsis, Miron V. Landau, Alexander Erenburg, Roxana Vidruk Nehemya, Moti Herskowitz

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The effects of chemical composition, texture, and promotion with potassium of coprecipitated and carbon-templated BaFe-hexaaluminate catalysts on their performance in reverse water gas shift (RWGS) reaction were studied in a fixed-bed catalytic reactor at T=350 °C, p=20 bar, H2: CO2 of 3. The methane selectivity at these conditions did not exceed 0.1 %. It was established that the rate of RWGS is strongly affected by the catalysts iron content gradually increasing up to 45 % Fe. Decreasing the catalyst nanocrystals platelets size (diameter/thickness) from 500–800/50–80 nm to 150–250/30–50 nm (SEM) by implementing the CT increased the surface area and the rates of reaction. Modeling of the redox cycle of RWGS by CO2-TPD, TP reaction and TP reduction indicated that H2 reduction is needed for regeneration of active sites Fe2+ ions associated with oxygen vacancies. Potassium displayed a strong promotion effect on the activity of Ba−Fe-hexaaluminates. At optimal K content of 6 wt %, the RWGS rates increased by a factor of 12–15 without changing the TOF number. This was attributed to increasing concentration of active sites due to the reduction of Fe3+ ions (XPS).

Original languageEnglish
Pages (from-to)3795-3805
Number of pages11
JournalChemCatChem
Volume10
Issue number17
DOIs
StatePublished - 7 Sep 2018

Keywords

  • catalysis
  • hexaaluminate
  • iron
  • performance
  • reverse water gas shift

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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