Particle size–activity relationship for CoFe2O4 nanoparticle CO oxidation catalysts

Evans, Gary; Kozhevnikov, Ivan V.; Kozhevnikova, Elena F.; Claridge, John B.; Vaidhyanathan, Ramanathan; Dickinson, Calum; Wood, Colin D.; Cooper, Andrew I.; Rosseinsky, Matthew J.

doi:10.1039/b807412g

Cited by 31 publications

(18 citation statements)

References 33 publications

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“…Therefore, these results suggest that CO oxidation follows a suprafacial mechanism where CO molecules react with adsorbed oxygen at the surface of the catalyst to form CO 2 . Thus, the difference in the catalytic performance of CO over CoFe 2 O 4 with seemingly the same composition as Co 2.1 Fe 0.9 O 4 is an evidence that the process is not dependent on the Co population in the cobalt ferrite oxide, but more dependent on the lattice and adsorbed oxygen, mainly adsorbed oxygen at the surface of the material in excellent agreement with report in the literature for the same material .…”

Section: Resultssupporting

confidence: 89%

Cobalt-iron oxides made by CVD for low temperature catalytic application

Kouotou

Tian

2015

Phys. Status Solidi A

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Thin films of cobalt‐iron oxides (CoFe2O4) with spinel‐type structure were prepared by pulsed‐spray evaporation chemical vapor deposition (PSE‐CVD) using Fe(acac)3 and Co(acac)3 as precursors. The optimal depositions of CVD‐type growth have been established and such growth can be achieved at 400 °C. The obtained films have been systematically characterized in terms of structure (XRD and Raman), surface, and bulk composition (XPS and EDS) as well as morphology (SEM). CoFe2O4 has been successfully tested as an active catalyst toward total oxidation of CO, C3H6, dimethyl ether (DME), and n‐C4H8. The results indicate that both the lattice and adsorbed oxygen presented at the surface of the catalyst play determinant roles in the catalytic oxidation process.

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Section: Resultssupporting

confidence: 89%

Cobalt-iron oxides made by CVD for low temperature catalytic application

Kouotou

Tian

2015

Phys. Status Solidi A

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“…A relationship between particle size and catalytic activity was recently evidenced in the case of CoFe 2 O 4 nanoparticles [40], thus for only one composition x = 1. Evans et al [40] showed that a increase of the particle size induces a significant lowering of the conversion rate at a given temperature; the variation of methane conversion rate at a given temperature, for a size variation of the particles from 6 to 8 nm, is around 10 to 15 %.…”

Section: Catalytic Activitymentioning

confidence: 99%

Synthesis and microstructure of cobalt ferrite nanoparticles

Ajroudi

Villain

Madigou

et al. 2010

Journal of Crystal Growth

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Cobalt ferrites (Co x Fe 3-x O 4 ) nanoparticles with various compositions were synthesized by a new non-aqueous synthesis method. The cobalt ferrites were characterized by X-rays diffraction, and transmission electron microscopy coupled with energy dispersive spectroscopy. The nanoparticles are highly crystallized, with a homogeneous chemical composition. The particle size varies from 4 nm up to 7.5 nm, depending on the cobalt content. The smallest particles, with a size of 4 nm, are obtained for high cobalt content.These particles have also the highest micro-structural strain. Catalytic measurements were realized using Fourier Transform Infrared Spectroscopy. The lowest activation energy and the highest conversion rate are obtained for Co 1.8 Fe 2.4 O 4 , in the 400-500 °C temperature range.

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“…Thus, high CO oxidation activity has been displayed by CoeFe mixed oxides or other Co spinel mixed oxide catalysts [21,22]. Iron has been also shown to be a promoter of the activity of alumina-supported cobalt catalysts for CO 2 hydrogenation [23].…”

Section: Introductionmentioning

confidence: 98%