Ammonia synthesis with barium-promoted iron–cobalt alloys supported on carbon

Stefan Hagen, Rasmus Barfod, Rasmus Fehrmann, Ib Chorkendorff, Claus J.H. Jacobsen, Herman T. Teunissen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Iron–cobalt alloys supported on carbon were investigated as ammonia synthesis catalysts. Barium was found to have a promoting effect for Fe with an optimum atomic ratio Ba/Fe of 0.35. At this Ba loading, a local maximum for the NH3 synthesis activity was found at 4 wt% Co by varying the Fe/Co ratio. Samples containing only Co and no Fe, however, yielded by far the most active catalysts (7.0 μmol (NH3) g−1 s−1, 673 K, 10 bar). Barium was a very efficient promoter for Co, increasing the NH3 synthesis activity by more than two orders of magnitude compared to the unpromoted Co samples, while it was not as effective for Fe. Power-law kinetic investigation revealed that, compared to the commercial Fe-based NH3 catalyst, the Ba–Co/C samples showed a lower inhibition by NH3 and were more active under ordinary ammonia synthesis conditions.
Original languageEnglish
JournalJournal of Catalysis
Volume214
Pages (from-to)327-335
ISSN0021-9517
Publication statusPublished - 2003

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