Production of C2–C4 Olefins with Fischer‐Tropsch–Synthesis: The Effect of Cu Promoter Loading on an Fe‐Cu‐K/SiO2 Catalyst

Niko Heikkinen (Corresponding Author), Dorela Dhamo, Ida Uotila, Matti Reinikainen, Roland Dittmeyer

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In this study we focus on the iron-based catalyst for the production of C2–C4 olefin hydrocarbons via the high-temperature Fischer-Tropsch synthesis. Promoters have a significant impact on catalyst stability, activity, and product selectivity. Therefore, we investigated the effect of the Cu promoter in an Fe-Cu-K/SiO2 catalyst. We compared the catalyst without Cu to the ones with 1, 2, 3, 4, and 5 wt-% Cu loading, respectively. The overall catalyst activity increased from 0 to 3 wt-% Cu loading and started to decrease at 4 and 5 wt-% Cu loadings. Although overall catalyst activity had an optimum with 3 wt-% Cu loading, the Cu loading had a negligible effect on product selectivity. However, when compared to a non-Cu-promoted catalyst, the Cu addition increased the selectivity towards olefinic C2–C4 hydrocarbons. The Fischer-Tropsch experiments were performed in a tubular reactor system at 300 °C, 21 bar and H2:CO=2 at different feed volume flow, with hydrogen activation. According to the performed temperature-programmed dynamic chemisorption analysis, the Cu promoter assisted the iron reduction, and the lower overall activity to 0–2 wt-% Cu loading might relate to insufficient dissociated H surface species, rather than the availability of C from dissociated CO.
Original languageEnglish
Article numbere202400560
JournalChemCatChem
DOIs
Publication statusAccepted/In press - 10 Jun 2024
MoE publication typeA1 Journal article-refereed

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