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Influence of temperature during pyrolysis of Fe-alginate

Unraveling the pathway towards highly active Fe/C catalysts

Journal Article (2022)
Author(s)

Joakim Tafjord (Norwegian University of Science and Technology (NTNU))

Samuel K. Regli (Norwegian University of Science and Technology (NTNU))

Iulian A. Dugulan (TU Delft - RID/TS/Instrumenten groep)

Magnus Rønning (Norwegian University of Science and Technology (NTNU))

Erling Rytter (Norwegian University of Science and Technology (NTNU))

Anders Holmen (Norwegian University of Science and Technology (NTNU))

Rune Myrstad (SINTEF Industry)

J. Yang (Norwegian University of Science and Technology (NTNU))

Research Group
RID/TS/Instrumenten groep
Copyright
© 2022 Joakim Tafjord, Samuel K. Regli, A.I. Dugulan, Magnus Rønning, Erling Rytter, Anders Holmen, Rune Myrstad, J. Yang
DOI related publication
https://doi.org/10.1016/j.apcata.2022.118834
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 Joakim Tafjord, Samuel K. Regli, A.I. Dugulan, Magnus Rønning, Erling Rytter, Anders Holmen, Rune Myrstad, J. Yang
Research Group
RID/TS/Instrumenten groep
Volume number
644
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Abstract

Transition metals supported on carbons play an important role in catalysis and energy storage. By pyrolysis of metal alginate, highly active catalysts for the Fischer-Tropsch synthesis (FTS) can be produced. However, the evolution of the carbon (alginate) and transition metal (Fe3+) during pyrolysis remains largely unknown and was herein corroborated with several advanced in situ techniques. Initially, Fe3+ was reduced to Fe2+, while bound to alginate. FeO nucleated above 300 °C, destabilizing the alginate functional groups. Increasing temperatures improved carbonization of the carbon support, which facilitated reduction of FeO to α-Fe at 630 °C. Catalysts were produced by pyrolysis between 400 and 700 °C, where the highest FTS activity (612 µmolCO gFe−1 s−1) was achieved for the sample pyrolyzed at low temperature. Lower metal loading, due to less decomposition of alginate, moderated sintering and yielded larger catalytic surface areas. The results provide valuable knowledge for rational design of metal-alginate-based materials.