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Citation: Xi Jing-Yu, Wang Zhi-Fei, Wang Wei-Ping, Lü ng-Xuan. In-situ XPS Study for Reaction Mechanism of Methanol Decomposition over Cu-Ni/Zn Catalyst[J]. Acta Physico-Chimica Sinica, ;2002, 18(01): 82-86. doi: 10.3866/PKU.WHXB20020119 shu

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

1.
State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou　730000

Received Date: 23 June 2001
Available Online: 15 January 2002

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.
- Methanol decomposition;Hydrogen;Cu-Ni/Zn catalyst;In-situ XPS; Reaction mechanism;Active center
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