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Catalysis Application of Magnetic Ferrites and Hexaferrites

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Handbook of Magnetic Hybrid Nanoalloys and their Nanocomposites

Abstract

It is known that one of the first minerals manipulated since the sixth century BC contained a ferrite structure, type Fe3O4, designated as spinel. Later on, it was discovered that the ferrites are a much larger family. Spinels and hexaferrites have a chemical structure containing tetrahedral and octahedral sites. In the case of hexaferrites, they have more complex active centers such as polyhedral units. Several ferrites are ferrimagnetic and have a wide range of applications, especially in heterogeneous catalysis and photocatalysis processes in aqueous medium, in which it is possible to extract the post-reaction solid by simple application of an external magnetic field, facilitating its recycling. Ferrites have several interesting chemical properties, due to the presence of acidic, basic, and redox sites, which are fundamental for applications in heterogeneous catalysis. In addition, they present a low recombination rate of electron-hole pairs which are associated with their low band gap energy, making these solids promising for application in photocatalysis. These properties can be tuned by modifying the cation’s composition and the degree of inversion. This chapter describes the fundamentals about spinel ferrites and hexaferrites and their structural and chemical properties, emphasizing their applications in heterogeneous catalysis and photocatalysis. Aspects associated with reactant and active site interaction were also described, since understanding the chemical surface for the target catalytic application and the different steps in the heterogeneous catalytic cycle is mandatory for the design and optimization of catalysts.

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Barbosa, F.F., de Oliveira Soares, J., Miranda, M.O., Torres, M.A.M., Braga, T.P. (2022). Catalysis Application of Magnetic Ferrites and Hexaferrites. In: Thomas, S., Rezazadeh Nochehdehi, A. (eds) Handbook of Magnetic Hybrid Nanoalloys and their Nanocomposites. Springer, Cham. https://doi.org/10.1007/978-3-030-90948-2_48

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