Understanding reaction-induced restructuring of well-defined FexOyCz compositions and its effect on CO2 hydrogenation

Andrey S. Skrypnik, Qingxin Yang, Alexander A. Matvienko, Victor Yu Bychkov, Yuriy P. Tulenin, Henrik Lund, Sergey A. Petrov, Ralph Kraehnert, Aleks Arinchtein, Jana Weiss, Angelika Brueckner, Evgenii V. Kondratenko

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Herein, we provide fundamentals relevant for the development of Fe-based catalysts for CO2hydrogenation to higher hydrocarbons. It was possible owing to preparation of well-defined FexOyCz compositions through controlled decomposition of iron oxalate, determination of their composition under CO2-FT reaction and catalytic tests in a broad range of CO2 conversion. Such steady-state composition changes along the catalyst bed. The changes and their strength depend on the initial phase composition. In addition to the reaction-induced catalyst restructuring, reaction pathways leading from CO2 to CO, CH4 and higher hydrocarbons were elucidated. A correlation between them and the steady-state composition was established and offers the possibility for tailored catalyst design and preparation. Our best performing promoter-free Fe-based catalyst shows the selectivity to CH4 below 10 %, while the selectivity to C2+-hydrocarbons is about 50 % at CO2 conversion of about 25 % and 300 °C. The olefin to paraffin ratio among C2-C4 hydrocarbons is 5.5.

Original languageEnglish
Article number120121
JournalApplied Catalysis B: Environmental
Volume291
DOIs
Publication statusPublished - 15 Aug 2021

Keywords

  • CO hydrogenation
  • Fischer-Tropsch
  • Iron oxalate decomposition
  • Iron oxide
  • Magnetite

OECD FOS+WOS

  • 2.04 CHEMICAL ENGINEERING
  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES

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