An XPS Investigation of Dimolybdenum Nitride Catalysts

The influence of synthesis temperature,passivated atmosphere and reduction temperature in hydrogen on the surface species of Mo₂N catalysts has been investigated with XPS.It was found that the low valence state Mo species on the catalyst surface rapidly increase with the reaction temperature.The introduced oxygen in the passivated procedure reacts with the catalyst surface to form the thin oxide layer.Nearly 80% of the oxygen species on the catalyst surface can be removed using the reduction treatment in hydrogen at 500℃.The characterization of TPD-MS,XRD,DTA and TG for the passivated and reduced samples are also used to interpretate the XPS results.