Keynote 2: Aspectos gerais das ferritas em catálise: Aplicação na desidrogenação oxidativa do etilbenzeno

Será apresentado o trabalho "Aspectos gerais das ferritas em catálise: Aplicação na desidrogenação oxidativa do etilbenzeno/Overview of ferrites in catalysis: Application in the oxidative dehydrogenation of ethylbenzene" nessa atividade.

Resumo da palestra: Spinels ferrites have a chemical structure containing tetrahedral and octahedral sites. Several ferrites are ferrimagnetic and have a wide range of applications, especially in heterogeneous catalysis and photocatalysis processes, in which 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 acid, basic and redox sites, which are fundamental 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 in photocatalysis. Specifically in the oxidative dehydrogenation of ethylbenzene, ferrites have shown interesting results compared to the traditional hematite-based catalyst due to its higher catalytic stability, minimizing the deactivation by phase change and carbon deposition. On the other hand, many surface reaction aspects still remain an open research field such as the participation of tetra and octahedral sites in the catalytic cycle.