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Characterization and Catalytic Properties of Ni‐Fe Spinel Catalysts for Total Oxidation of Ethanol
Author(s) -
Benrabaa Rafik,
Benadda Amel,
HammicheBellal Yasmina,
Boukhlouf Hamza,
Trentesaux Martine,
Rubbens Annick,
Vannier RoseNoëlle,
Löfberg Axel
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900057
Subject(s) - x ray photoelectron spectroscopy , catalysis , spinel , raman spectroscopy , rietveld refinement , hydrothermal circulation , materials science , ammonia , particle size , chemical engineering , inorganic chemistry , nuclear chemistry , chemistry , crystal structure , crystallography , metallurgy , organic chemistry , physics , optics , engineering
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 °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 ∼ 300 °C. Ni 2+ 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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