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Acta Physico-Chimica Sinica  2002, Vol. 18 Issue (01): 82-86    DOI: 10.3866/PKU.WHXB20020119
Note     
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
State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000
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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 wordsMethanol decomposition      Hydrogen      Cu-Ni/Zn catalyst      In-situ XPS     
Received: 23 June 2001      Published: 15 January 2002
Corresponding Authors: Lü Gong-Xuan     E-mail: gxlu@ns.azb.ac.cn
Cite this article:

Xi Jing-Yu;Wang Zhi-Fei;Wang Wei-Ping;Lü Gong-Xuan. In-situ XPS Study for Reaction Mechanism of Methanol Decomposition over Cu-Ni/Zn Catalyst. Acta Physico-Chimica Sinica, 2002, 18(01): 82-86.

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http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20020119     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2002/V18/I01/82

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