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Chem. J. Chinese Universities ›› 1996, Vol. 17 ›› Issue (1): 102.

• Articles • Previous Articles     Next Articles

Synergistic Mechanism of Ethane and Ethene over Zn/HZSM-5 Zeolite

CAO Rong1, ZHAO Hong1, CHENG Mo-Jie2, YANG Ya-Shu2   

  1. 1. Xinjiang Institute of Chemistry, Chinese Academy of Sciences, Wulumuqi 830011;
    2. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian
  • Received:1995-01-03 Online:1996-01-24 Published:1996-01-24

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Abstract: The characteristic features of acidic species and metallic lewis species in HZSM-5,Zn/HZSM-5,NaHZSM-5and NaZnHZSM-5have been studied by using the chemical andphysical methods of NH3-TPD,IR-OH,Py-IR,CO-IRand XPS. The aromatization ofethane and ethene has been investigated over the catalysts.It is evidenced that a new kind ofactive sites──Zn2+-Lacid center was formed which lead to the decrease ofBr0wnsted acidof ZSM-5 zeolite.Zn2+-Lacid is found to be a strong acid center.Impregnation of NaOHonzeolites also leads to the decrease of Brownsted acid.The aromatization selectivity and activi-ty of ethane and ethene have a close relation with bifunctional center of Zn2+-Lacid andBrownsted acid and there is an optimum balance between the metal content and Brownstedacid.Therefore,there exists an optimum zinc content in Zn/HZSM-5 catalysts during thearomatization of ethane and ethene.

Key words: Zn/HZSM-5.Aromatization of ethane and ethene, Synergistic mechanism

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