78. Magnetically Induced CO2 Methanation using Exchange-coupled Spinel Ferrites in Cuboctahedron-shaped Nanocrystals

Beatriz Rivas-Murias, Juan M. Asensio, Nicolas Mille, Benito Rogríguez-González, Pier-Francesco Fazzini, Julian Carrey, Bruno Chaudret and Verónica Salgueiriño

Angewandte Chemie I. Ed. (2020) 59, 15537-15542 (DOI: 10.1002/anie.202004908).

Magnetically induced catalysis can be promoted taking advantage of optimal heating properties from the magnetic nanoparticles to be employed. However, when unprotected, these heating agents that are usually air-sensitive, get sintered under the harsh catalytic conditions. In this context, we present, to the best of our knowlege, the first example of air-stable magnetic nanoparticles that: 1) show excellent performance as heating agents in the CO2 methanation catalyzed by Ni/SiRAlOx, with CH4 yields above 95%, and 2) do not sinter under reaction conditions. To attain both characteristics we demonstrate, first the exchange-coupled magnetic approach as an alternative and effective way to tune the magnetic response and heating efficiency, and second, the chemical stability of cuboctahedron-shaped core-shell hard CoFe2O4 - soft Fe3O4 nanoparticles.

43 2020 Angew