催化学报 ›› 2012, Vol. 33 ›› Issue (10): 1724-1729.DOI: 10.3724/SP.J.1088.2012.20650

• 研究论文 • 上一篇    下一篇

核壳型SAPO-34/AlPO-18 分子筛的制备及生长机理

张琳1, 田鹏1, 苏雄1,2, 樊栋1,2, 王德花1,2, 刘中民1,*   

  1. 1中国科学院大连化学物理研究所洁净能源国家实验室 (筹), 甲醇制烯烃国家工程实验室, 辽宁大连 116023; 2中国科学院研究生院, 北京 100049
  • 收稿日期:2012-06-26 修回日期:2012-07-26 出版日期:2012-09-28 发布日期:2012-09-28

Synthesis and Growth Mechanism of the Core-Shell SAPO-34/AlPO-18 Molecular Sieves

ZHANG Lin1, TIAN Peng1, SU Xiong1,2, FAN Dong1,2, WANG Dehua1,2, LIU Zhongmin1,*   

  1. 1Dalian National Laboratory for Clean Energy, National Engineering Laboratory for Methanol-to-Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2Graduate University of Chinese Academy of Sciences, Beijing100049, China
  • Received:2012-06-26 Revised:2012-07-26 Online:2012-09-28 Published:2012-09-28

摘要: 采用水热法制备了核壳型 SAPO-34/AlPO-18 分子筛, 并运用 X 射线衍射、扫描电镜和超高分辨场发射扫描电镜等方法对样品进行了表征. 结果表明, 通过改变实验条件可有效调控壳层 AlPO-18 纳米晶在 SAPO-34 晶体表面的生长, 从而得到具有不同生长区域、生长取向及紧密度的核壳型 SAPO-34/AlPO-18 分子筛. 超高分辨场发射扫描电镜结果发现, 核相 SAPO-34 晶体的外表面结构与壳层 AlPO-18 纳米晶的生长性质紧密相关, 从而推测出核相晶体外表面微细结构诱导壳层分子筛生长的晶化机理.

关键词: 核壳分子筛, SAPO-34, AlPO-18, 生长机理, 超高分辨场发射扫描电镜

Abstract: The core-shell molecular sieves comprised of SAPO-34 as core and AlPO-18 as shell were hydrothermally synthesized and characterized by X-ray diffraction, scanning electron microscopy (SEM), and ultra-high resolution field-emission scanning electron microscopy (FE-SEM) techniques. The SEM results show that the growth of the shell AlPO-18 nanocrystals with different orientations and compactness can be controlled by adjustment of the synthesis conditions such as core pretreatment, liquid to solid ratio, and growth number. The ultra-high resolution FE-SEM images confirm that the growth performance of the shell AlPO-18 is closely related to the surface microstructure of SAPO-34, indicating the mechanism that the microstructure on the external surface of the core directs the growth of the shell.

Key words: core-shell molecular sieve, SAPO-34, AlPO-18, growth mechanism, ultra-high resolution field-emission scanning electron microscopy