Citation: LI Bing, TIAN Peng, QI Yue, ZHANG Lin, XU Shutao, SU Xiong, FAN Dong, LIU Zhongmin. Study of crystallization process of SAPO-11 molecular sieve[J]. Chinese Journal of Catalysis, ;2013, 34(3): 593-603. doi: 10.1016/S1872-2067(12)60542-7 shu

Study of crystallization process of SAPO-11 molecular sieve

LI Bing ^a ,
TIAN Peng ^a ,
QI Yue ^a ,
ZHANG Lin ^a ,
XU Shutao ^a ,
SU Xiong ^a,b ,
FAN Dong ^a,b ,
LIU Zhongmin ^a,,

1.
a Dalian 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;

Corresponding author: LIU Zhongmin,
Received Date: 21 November 2012
Available Online: 30 December 2012

The crystallization process of SAPO-11 was studied using a combination of X-ray diffraction, scanning electron microscopy, X-ray fluorescence, nuclear magnetic resonance, and X-ray photoelectron spectroscopy. In the initial stage of crystallization, SAPO-11 was formed along with an unknown crystalline material composed of Si-P-Al. As crystallization evolved, the crystalline material dissolved. The SAPO-11 formation rate increased greatly, which is characteristic of fast crystallization. After 2.33 h, the relative crystallinity of SAPO-11 reached ~100% and remained at a high level until crystallization was complete. Si was incorporated into the SAPO-11 framework from the initial stage of crystallization. The Si content of the solid samples increased with crystallization time. Most of the Si atoms existed as Si islands in the SAPO-11 framework, resulting in the presence of multiple coordination environments, i.e., Si(nAl, (4-n)Si), n=0-4. X-ray photoelectron spectroscopy analysis revealed Si enrichment on the external surfaces of the SAPO-11 crystals. Based on the experimental results, the distribution of Si in the crystals is not uniform, showing an increasing trend from the core to the surface.
- SAPO-11 molecular sieve,
- Characterization,
- Crystallization process,
- Silicon distribution
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