Abstract
AbstractThe structural changes produced during the reduction by H2 at different temperatures (300–800°C range) of a commercial Co‐Mo/γAl2O3 hydrodesulphurization catalyst have been investigated by x‐ray photoelectron spectroscopy (XPS), ion scattering spectroscopy (ISS) and infrared (IR) of absorbed NO, as a probe‐molecule. In all samples, different cobalt phases are observed. A fraction of cobalt interacts with the alumina support (CoAl2O4‐like, species which was reducible only at the highest temperatures) and another fraction forms a phase interacting with the molybdenum atoms (species easily reducible at moderate temperatures). XPS and ISS results indicated that, at reduction temperatures above 600°C, several effects are produced: (a) an increase of metallic cobalt, (b) a decrease of CoAl2O4 concentration and simultaneous crystallization of MoO2 species, and (c) a decrease of the molybdenum dispersion. From the IR spectra of NO probe chemisorbed on reduced catalyst at 800°C, it was concluded that the slight increase of the Co0 exposure could be due to reduction of CoAl2O4‐like species.
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