TY - JOUR
T1 - Influence of temperature during pyrolysis of Fe-alginate
T2 - Unraveling the pathway towards highly active Fe/C catalysts
AU - Tafjord, Joakim
AU - Regli, Samuel K.
AU - Dugulan, Achim Iulian
AU - Rønning, Magnus
AU - Rytter, Erling
AU - Holmen, Anders
AU - Myrstad, Rune
AU - Yang, Jia
PY - 2022
Y1 - 2022
N2 - 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.
AB - 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.
KW - Alginate
KW - Carbon
KW - Fischer-Tropsch synthesis
KW - Iron
KW - Pyrolysis
UR - http://www.scopus.com/inward/record.url?scp=85136295174&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2022.118834
DO - 10.1016/j.apcata.2022.118834
M3 - Article
AN - SCOPUS:85136295174
SN - 0926-860X
VL - 644
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
M1 - 118834
ER -