期刊
CHEMISTRYSELECT
卷 4, 期 21, 页码 6415-6420出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201900057
关键词
characterization; ethanol combustion; NiFe2O4; reducibility; spinel
资金
- Chevreul Institute [FR 2638]
- Ministere de l'Enseignement Superieur et de la Recherche
- Region Hauts de France
- FEDER
This paper deals with the study of the reducibility of Ni-Fe spinel oxides prepared by co-precipitation and hydrothermal methods with NaOH or ammonia and their behavior in ethanol combustion. The reducibility was investigated by X-ray photoelectron spectroscopy (XPS) after pretreatment under H-2 at 400 degrees C. Depending on the synthesis method, structural properties (X-ray powder diffraction (XRD) and Raman analysis), the surface area (BET), particle size (Rietveld refinement), as well as the surface Ni/Fe atomic ratio (XPS) and the behavior upon reduction varied. The best performances were obtained for hydrothermal conditions with a total conversion achieved at similar to 300 degrees C. Ni2+ species seem to play a significant role in complete oxidation of ethanol; they were identified as the active species. A good correlation between structural, textural, reducibility and catalytic activity was established.
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