Abstract
Oxides with good catalytic performances and more selectivity to valuable chemicals attract numerous research interests for the oxidation of hydrocarbon fuels. Taking advantage of the nanocasting route, CeFe-based nanocomposites were prepared and characterized to achieve superior stability in the oxidation of cyclic compounds. Adding a third metal (Me = Ni2+, Mn2+/Mn3+ or Co2+/Co3+) to the CeFe-based oxide helped the formation of Ce3+/Ce4+, Fe2+/Fe3+ and active couples in the ternary nanocomposites. The solids having a spherical morphology and good textural properties enabled the formation of promising ternary oxide catalysts for the oxidation of ethylbenzene compared with those of binary and single monoxide nanocomposites. The close contact among the Ce3+/Ce4+ and Fe2+/Fe3+ pairs with Ni2+ species provided the formation of a highly stable CeFeNi catalyst with enhanced performance in the oxidation of cyclic compounds such as ethylbenzene, styrene and benzyl alcohol substrates.
Highlights
Iron-based catalysts are widely used in many important chemical transformations such as oxidation and dehydrogenation reactions [1,2]
1370 cm-1 are not visible due to CeO2 covering the previously mentioned iron phases, as observed elsewhere [17]. These results indicate that the semi-crystalline materials have the CeFe as a matrix besides the third oxide existing as NiO, Co3 O4, or MnOx appears isolated, respectively, in CFN, CFC, and CFM solids
CeFe-based oxide composites were synthesized by a nanocasting route
Summary
Iron-based catalysts are widely used in many important chemical transformations such as oxidation and dehydrogenation reactions [1,2]. Compared to the use of other oxides in catalytic oxidation reactions, the iron-based solids have various advantages including their importance for environmental chemistry, low cost, easy recovery and lower toxicity. In this regard, iron-based oxides are very attractive from the perspective of replacing liquid catalysts in the selective oxidation of hydrocarbons [1,2,3,4,5,6]. The selective oxidation of cyclic compounds to their corresponding aldehydes, ketones, or carboxylic acid has gained great interest from both the industrial and academic point of view [7,8,9,10,11].
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