Reduction and carburization of iron oxides for Fischer–Tropsch synthesis

Monia Runge Nielsen, Asger Barkholt Moss, Anton Simon Bjørnlund, Xi Liu, Axel Knop-Gericke, Alexander Yu Klyushin, Jan-Dierk Grunwaldt, Thomas L. Sheppard, Dmitry E. Doronkin, Anna Zimina, Thomas Eric Lyck Smitshuysen, Christian Danvad Damsgaard, Jakob Birkedal Wagner, Thomas Willum Hansen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The activation of iron oxide Fischer–Tropsch synthesis (FTS) catalysts was investigated during pretreatment: reduction in hydrogen followed by carburization in either CO or syngas mixture, or simultaneously reduction and carburization in syngas. A combination of different complementary in situ techniques was used to gain insight into the behavior of Fe-based FTS catalysts during activation. In situ XRD was used to identify the crystalline structures present during both reduction in hydrogen and carburization. An increase in reduction rate was established when increasing the temperature. A complete reduction was demonstrated in the ETEM and a grain size dependency was proven, i.e. bigger grains need higher temperature in order to reduce. XPS and XAS both indicate the formation of a small amount of carbonaceous species at the surface of the bulk metallic iron during carburization.
Original languageEnglish
JournalJournal of Energy Chemistry
Volume51
Pages (from-to)48-61
ISSN2095-4956
DOIs
Publication statusPublished - 2020

Keywords

  • In situ characterization
  • Fischer–Tropsch
  • Catalyst reduction and carburization
  • Iron oxides

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