催化学报

催化学报 ›› 2016, Vol. 37 ›› Issue (4): 628-635.DOI: 10.1016/S1872-2067(15)61062-2

• 论文 • 上一篇    

增强LPG催化裂化催化剂ZSM-5稳定性的新方法:脱铝和负载硅

Leyla Vafi, Ramin Karimzadeh   

  1. 塔比阿特莫达勒斯大学化工系, 德黑兰, 伊朗
  • 收稿日期:2015-12-20 修回日期:2016-02-21 出版日期:2016-03-30 发布日期:2016-03-30
  • 通讯作者: Ramin Karimzadeh
  • 基金资助:

    国际科学基金会.

A novel method for enhancing the stability of ZSM-5 zeolites used for catalytic cracking of LPG: Catalyst modification by dealumination and subsequent silicon loading

Leyla Vafi, Ramin Karimzadeh   

  1. Department of Chemical Engineering, Tarbiat Modares University, Jalal Al Ahmad Highway, P.O. Box 14155-4838, Tehran, Iran
  • Received:2015-12-20 Revised:2016-02-21 Online:2016-03-30 Published:2016-03-30
  • Contact: Ramin Karimzadeh
  • Supported by:

    This work was partly supported by the International Science Foundation.

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1181

被引次数

2

摘要：

以碳纳米管为模板合成的带有介孔和微孔的ZSM-5分子筛具有不同的复合结构. 用三氯乙酸(TCA)可选择性地将中孔的铝脱除. 基于TCA分子大小, 它可能只扩散到中孔中, 因而使得微孔部分不脱铝. 从分子筛结构中脱除铝原子导致催化剂中出现中空的空间. 若将硅原子填充到空位中, 那么介孔部分的结构会变得与硅酸盐类似, 不具有催化性能. 本文使用含硅的溶液来填充空位, 将硅原子直接取代中孔结构中的铝原子. 通过此特殊方法改变微孔和介孔的几何形状和性质, 从而使改性HZSM-5上的积碳量从14%降低至3%.

关键词: 介孔, 碳纳米管, ZSM-5分子筛, 脱铝, 三氯乙酸

Abstract:

Composite structures of ZSM-5 zeolites were prepared by the synthesis of mesopores and micropores using carbon nanotubes as a template. Dealumination of mesopores was performed selectively using trichloroacetic acid, which could only diffuse into the mesopores and not the micropores owing to the size of the trichloroacetic acid molecules. Empty spaces are created in the catalyst as a result of removal of the Al atoms from the zeolite structure. If Si atoms fill the empty space, then the structure of the mesopores becomes similar to silicates, which do not have any catalytic properties. Silicon containing solution was used to fill the empty spaces, and in doing so, a unique method was developed, by which silicon atoms can directly replace the extracted Al atoms from the mesopore structure. Therefore, by changing the geometry and properties of the mesopores and micropores, the amount of coke reduced from 14% for HZSM-5 to 3% for the modified zeolite.

Key words: Mesopores, Carbon nanotube, ZSM-5 zeolite, Dealumination, Trichloroacetic acid