Abstract:

XPS has been applied to study the reduction influence of the passivated Mo2N sample on H2 chemisorption at room temperature. It is found that most of the Mo6+ species was reduced to low valence molybdenum species (Moδ+:δ≦4) when reduction temperature was raised up to 673K, meanwhile sharp increases of both the irreversible and reversible hydrogen uptakes were measured. The irreversible amount increased to a larger extent. Accordingly, the active sites towards hydrogen adsorption are tentatively proposed to the low valence molybdenum species with nitrogen deficient.

Key words: Mo₂N, X-ray photoelectron spectroscopy, Hydrogen chemisorption