Abstract
Raman spectra of a commercial Co-Mo/Al 2O 3 hydrodesulphurization catalyst were recorded in an H 2S/H 2 atmosphere at 400°C by means of a specially designed in-situ cell. For an improvement of the signal to noise ratio the incident laser beam was scanned over the surface of the sample by reflection from a rotating octagon. The spectra proof that the so called “Co-Mo-S” crystallites are present as an MoS 2-type layered material with an average particle size of each slab being larger than sometimes proposed up to now.
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