Mixed oxides of cerium and manganese as catalysts for total oxidation of ethyl acetate: effect of preparation procedure

The microstructure of manganese and cerium oxide bi-component materials with different Ce/Mn ratio, obtained by co-precipitation and template assisted hydrothermal techniques, is studied in details by nitrogen physisorption, XRD, SEM, TEM, XPS and Raman spectroscopies and TPR with hydrogen. The catalytic behaviour of the composites in total oxidation of ethyl acetate is investigated. It is found that the close contact between manganese and cerium metal oxide nanoparticles is realized by interface layer of isomorphously substitituted or incorporated in interstitial positions in ceria lattice manganese ions in different oxidative state. The physicochemical data evidence that this interface layer stabilizes a shell of finely dispersed CeO2 species on the core of MnOx entities, which plays a decisive role in the catalytic process. [GRAPHICS] .

Automated summary

This study investigates the microstructure of manganese and cerium oxide bi-component materials with different Ce/Mn ratios, obtained through co-precipitation and template assisted hydrothermal techniques. The catalytic behavior of these composites in the total oxidation of ethyl acetate is also analyzed. The results indicate that a close contact between manganese and cerium metal oxide nanoparticles is achieved through an interface layer, where manganese ions in different oxidative states are isomorphously substituted or incorporated in interstitial positions in the ceria lattice. This interface layer stabilizes a shell of finely dispersed CeO2 species on the core of MnOx entities, which plays a decisive role in the catalytic process.