Abstract
The adsorption of O 2 and NO on polycrystalline MoS 2 has been studied by XPS at temperatures from 80 to 300 and to 700 K, respectively. The data suggest that oxygen is adsorbed in a molecular form at low temperature on coordinatively unsaturated (cus) Mo sites in a lowered valence state and that much of it can be desorbed without oxidation of the MoS 2 as the temperature is raised to 300 K. By contrast, NO was partially dissociated at T > 130 K and surface oxidation became detectable at T > 200 K. In this respect the present results differ significantly from literature reports for reduced and/or sulfided molybdena-alumina catalysts where molecular NO adsorbs in the form of dimer or dinitrosyl species. A physisorbed state was also detected at T ≤180 K.
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