高等学校化学学报

高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (1): 102.

• 论文 • 上一篇    下一篇

Zn/HZSM-5分子筛上乙烯、乙烷芳构化的协同作用机理

曹荣1, 赵洪1, 程谟杰2, 杨亚书2   

  1. 1. 中国乌鲁木齐科学院新疆化学研究所, 乌鲁木齐 830011;
    2. 中国科学院大连化学物理研究所
  • 收稿日期:1995-01-03 出版日期:1996-01-24 发布日期:1996-01-24
  • 通讯作者: 曹荣,女,27岁,硕士,助研.
  • 作者简介:曹荣,女,27岁,硕士,助研.
  • 基金资助:

    新疆维吾尔自治区科学技术委员会科学研究与技术开发(含攻关)项目

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

PDF (PC)

被引次数

12

摘要： 运用NH3-TPD、IR-OH、Py-IR、CO-IR及XPS等手段对Zn/HZSM-5及其浸碱催化剂的酸组分和金属组分构成的L酸性质进行了表征,考察了催化剂对乙烯、乙烷的芳构化作用。发现Zn/HZSM-5中形成了Zn2+-L强酸中心,使分子筛的B酸中心减少。浸碱也可使分子筛的B酸减少,芳构化反应的活性和选择性均与Zn/HZSM-5的双中心Zn2+-L酸和B酸的相互匹配密切相关,B酸和L酸存在最适合匹配,因此Zn/HZSM-5在乙烯、乙烷芳构化反应中存在最佳锌含量。

关键词: Zn/HZSM-5, 乙烯、乙烷芳构化, 协同作用

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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