Abstract
Thin film cobalt-molybdenum oxides, deposited with varying composition and structure on an alumina support, have been used as precursor oxides to form model hydrodesulphurization catalysts. The hydrodesulphurization (HDS) activities of the reduced and sulphided thin films have been measured in a closed cycle reactor, and the final surface composition and structure of the catalysts have been studied using X-ray photoelectron spectrometry (XPS) directly interfaced to the reactor. The presence of cobalt is found to increase the sulphidation of molybdenum oxide precursor. A thin film precursor oxide with an oxide structure of CoMoO 4 was found to produce the most HDS-active sulphide surface. The corresponding XPS spectra show that both molybdenum and cobalt species have structures which differ from those of MoS 2 and Co 9S 8.
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