On the Mn promoted synthesis of higher alcohols over Cu derived ternary catalysts

Eleni T. Liakakou, Mark Isaacs, Karen Wilson, Adam F. Lee, Eleni Heracleous*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This work provides insight into the promotional effect of Mn on the synthesis of higher alcohols over Cu-based ternary catalysts through XPS and in situ DRIFTS and powder XRD. These revealed that the surface of K-CuZnAl, an active catalyst for CO hydrogenation to methanol, possesses Cu+ sites able to adsorb CO associatively and Cu0 sites for H2 dissociation. Here we show that exchanging Zn with Mn induces a strong interaction between Cu and Mn that decreases the overall copper surface area and increases the Cu+/Cu0 ratio. In situ DRIFTS showed that electronic modification of Cu+ sites by proximate Mn favors dissociative CO chemisorption, resulting in the formation of C and O adspecies that are precursors to higher alcohol formation. The decrease in metallic copper limits available sites for H2 dissociation, and hence retards the hydrogenation of oxygen-containing intermediates, thereby further promoting carbon-chain growth. Mn also increases the dispersion of K promoter over the catalyst surface, providing abundant basic sites for aldol-type condensation reactions to branched oxygenates.
Original languageEnglish
Pages (from-to)988-999
Number of pages12
JournalCatalysis Science and Technology
Issue number4
Early online date23 Jan 2017
Publication statusPublished - 21 Feb 2017

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