Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (08): 678-680.doi: 10.3866/PKU.WHXB19950802

• Communication • Previous Articles     Next Articles

Reduction Effects of the Passivated Mo2N Studied by XPS and H2 Chemisorption

Li Xin-Sheng,Sheng Shi-Shan,Chen Heng-Rong,Ji Chun-Xin,Zhang Yao-Jun,Xin Qin   

  1. State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
  • Received:1995-05-02 Revised:1995-06-12 Published:1995-08-15
  • Contact: Li Xin-Sheng

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