Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (01): 82-86.doi: 10.3866/PKU.WHXB20020119

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In-situ XPS Study for Reaction Mechanism of Methanol Decomposition over Cu-Ni/Zn Catalyst

Xi Jing-Yu;Wang Zhi-Fei;Wang Wei-Ping;Lü Gong-Xuan   

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000
  • Received:2001-06-23 Revised:2001-09-18 Published:2002-01-15
  • Contact: Lü Gong-Xuan E-mail:gxlu@ns.azb.ac.cn

Abstract: Insitu XPS and TPDMS techniques were used to study the reaction mechanism and the active center of CuNi/Zn catalyst for methanol decomposition.Significant amount of CH3OH、H2 and CO were detected during the methanol decomposition with TPDMS,however no evidences of CH4、CH3OCH3 and HCOOCH3 formation were obtained.TPDMS results indicated that O-H and C-H bonds instead of C-O bond were broken in methanol decomposition on Cu/Zn/Ni catalyst.It was found that H2 desorption from the surface of CuNi/Zn catalyst was the rate control step.Insitu XPS studies confirmed that the Zn species was easily reduced when temperature was higher than 200 ℃ in Cu/Zn catalyst.However,similar reduction of Zn was not observed in Cu/Zn/Ni catalyst.Furthermore,both Cu+ and Cu0 species were observed in Cu/Zn/Ni catalyst.Our study indicated that active center(s) in Cu/Zn/Ni catalyst may be Cu0 and/or Cu+ species,in which Cu+ formed during the reaction.

Key words: Methanol decomposition, Hydrogen, Cu-Ni/Zn catalyst, In-situ XPS