This Debye lunch lecture Activity enhancement of cobalt catalysts by tuning metal-support interactions will be given by Carlos Hernández Mejía from the Inorganic Chemistry & Catalysis research group.
Metal nanoparticles are of great interest for many applications because of their unique properties. Differences in surface composition can occur especially for nanoparticles on a support. For example, metal suboxides can be formed from reducible oxidic supports and these suboxides can (partially) cover the metal nanoparticles. Consequently, the nanoparticle’s surface composition undergoes chemical changes that influence the overall properties of the material. However, control over this metal-support interactions has been limited. Here, we investigated reduction-oxidation-reduction (ROR) treatments as a method to affect metal-support interactions and related catalytic performance for cobalt supported on reducible (TiO2 and Nb2O5) and irreducible (α-Al2O3) oxides. The modified metal-support interactions resulted in a twofold increase in metallic cobalt surface area when supported on reducible oxides. Likewise, their cobalt-based catalytic activity doubled during Fischer-Tropsch synthesis at industrially relevant conditions. The ROR treatment proved an effective approach to tune the interaction between metallic nanoparticles and reducible oxidic supports, leading to improved catalytic performance.
Click the link to the article:
Activity enhancement of cobalt catalysts by tuning metal-support interactions
C. Hernández Mejía, T.W. van Deelen, K.P. de Jong, Nat. Commun. 9 (2018) 4459. doi:10.1038/s41467-018-06903-w