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Sulfur-Tolerant, Exsolved Fe–Ni Alloy Nanoparticles for CO Oxidation

Lookup NU author(s): Dr Evangelos Papaioannou, Dr Dragos Neagu, Professor Ian Metcalfe



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Metallic nanoparticles exsolved at the surface of perovskite oxides have been recently shown to unlock superior catalytic activity and durability towards various chemical reactions of practical importance. For example, for the CO oxidation reaction, exsolved Ni nanoparticles in oxidised form exhibit site activities approaching those of noble metals. This is of particular interest for the prospect of replacing noble metals with earth-abundant metal/metal oxide catalysts in the automotive exhaust control industry. Here we show that for the CO oxidation reaction, the functionality of exsolved Ni nanoparticles can be further improved when Fe is co-exsolved with Ni, as Fe–Ni alloy nanoparticles, eventually forming mixed oxide nanoparticles. As compared to the Ni nanoparticles, the alloy nanoparticles exhibit higher site activities, greatly improved durability over 170 h of continuous testing and increased tolerance towards sulphur-based atmospheres. Similarly to the single metal nanoparticles, the alloys demonstrate outstanding microstructural stability and high tolerance towards coking. These results open additional directions for tailoring the activity and durability of exsolved materials for the CO oxidation reaction and beyond.

Publication metadata

Author(s): Papaioannou EI, Neagu D, Ramli WKW, Irvine JTS, Metcalfe IS

Publication type: Article

Publication status: Published

Journal: Topics in Catalysis

Year: 2019

Volume: 62

Issue: 17-20

Pages: 1149-1156

Print publication date: 01/11/2019

Online publication date: 05/10/2018

Acceptance date: 05/10/2018

Date deposited: 09/10/2018

ISSN (print): 1022-5528

ISSN (electronic): 1572-9028

Publisher: Springer US


DOI: 10.1007/s11244-018-1053-8


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