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Cobalt and cobalt carbide on alumina/NiAl(110) as model catalysts

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Abstract

Cobalt is an important catalyst for Fischer–Tropsch synthesis, and it can form cobalt carbide under syngas (CO + H2) reaction conditions, especially in CO-rich mixtures. As cobalt carbide has been credited as a promoter which brings about significant selectivity changes in CO hydrogenation, we are interested in studying it using a surface science approach, to understand its interaction with important reaction intermediates. In the present study, we use a NiAl(110) surface to produce a flat alumina film and prepare cobalt and cobalt carbide thereon. We find that cobalt is thermally stable up to 800 K on alumina/NiAl(110). Different preparation temperatures result in different morphologies of the surface. Cobalt carbide is obtained by evaporating cobalt in an C2H4 environment, as proved by the appearance of a C 1s peak at 283.3 eV of carbidic carbon and at 286.2 eV of chemisorbed CO on cobalt carbide in the XPS spectra. Large cobalt carbide crystals with a typical size of 100 nm × 50 nm are revealed by STM. The results show that cobalt and cobalt carbide on alumina/NiAl(110) can serve as suitable model systems for studying structures, adsorption and catalytic properties.

Graphical abstract: Cobalt and cobalt carbide on alumina/NiAl(110) as model catalysts

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Publication details

The article was received on 01 Sep 2017, accepted on 27 Oct 2017 and first published on 30 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01806A
Citation: Catal. Sci. Technol., 2017, Advance Article
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    Cobalt and cobalt carbide on alumina/NiAl(110) as model catalysts

    T. Zhang, J. Wu, Y. Xu, X. Wang, J. Ni, Y. Li and J. W. (. Niemantsverdriet, Catal. Sci. Technol., 2017, Advance Article , DOI: 10.1039/C7CY01806A

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