1 research outputs found
Electron Tomography Reveals the Active Phase–Support Interaction in Sulfidic Hydroprocessing Catalysts
Conventional two-dimensional
(2D) transmission electron microscopy
of sulfidic hydroprocessing catalysts can be deceiving and give the
impression that parts of the support are overloaded with active phase.
High-angle annular dark field scanning transmission electron microscopy
tomography reveals details on the morphology of MoS<sub>2</sub> crystallites
and their interaction with the Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> support particles. The three-dimensional (3D) reconstruction
shows that the active phase is mainly present as MoS<sub>2</sub> single
slabs of various shapes aligned with the support. It becomes clear
that the surface of the support particles is, in fact, only partly
covered by the active phase and the pores remain accessible for reactant
molecules