催化学报

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不同锌盐改性的HZSM-5催化剂上甲醇芳构化反应

毕怡a,b, 王莹利a, 陈欣a, 于政锡a, 许磊a   

  1. a 中国科学院大连化学物理研究所洁净能源国家实验室(筹), 辽宁 大连 116023;
    b 中国科学院大学, 北京 100049
  • 收稿日期:2014-03-22 修回日期:2014-04-09 出版日期:2014-09-28 发布日期:2014-09-30
  • 通讯作者: 许磊
  • 基金资助:

    国家自然科学基金(21103176).

Methanol aromatization over HZSM-5 catalysts modified with different zinc salts

Yiia,b, Yingli Wanga, Xin Chena, Zhengxi Yua, Lei Xua   

  1. a Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-03-22 Revised:2014-04-09 Online:2014-09-28 Published:2014-09-30
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21103176).

摘要:

分别用ZnSO4,Zn(AcO)2,Zn(NO32和ZnCl2溶液对HZSM-5分子筛浸渍改性得到不同Zn盐改性的HZSM-5催化剂. 采用X射线衍射、N2物理吸附、热重-质谱分析、氨程序升温脱附和吡啶吸附红外光谱等方法对改性后的催化剂进行了表征,并在固定床反应装置上考察了其甲醇芳构化反应性能. 结果表明,不同Zn盐改性的HZSM-5催化剂上Zn物种的存在形式不同会导致其表面酸中心强度与分布具有较大差异,经ZnSO4改性的HZSM-5催化剂表面上强B酸中心和Zn物种的存在使其表现出最佳的甲醇芳构化反应性能.

关键词: HZSM-5分子筛, 锌盐, 甲醇, 芳构化

Abstract:

HZSM-5 catalysts modified with various Zn salts, namely zinc sulfate, zinc acetate, zinc nitrate, and zinc chloride, were prepared using an impregnation method. The resultant catalysts were characterized by X-ray diffraction, N2 adsorption, thermogravimetry-mass spectrometry, temperature-programmed desorption of NH3, and infrared spectroscopy using pyridine as the probe molecule. The methanol-to-aromatic (MTA) performance over the modified catalysts was investigated. The results showed that the type of Zn species in the catalyst significantly influenced the catalyst surface acidity. The distribution of acid sites and Zn species in the HZSM-5 catalyst modified with zinc sulfate effectively improved the MTA performance.

Key words: HZSM-5 zeolite, Zinc salt, Methanol, Aromatization