Citation: GUO Yun-Ya, LIANG Guang-Hua, ZHANG Yan-Ting, HE Zu-Guang, LIANG Ya-Ning, LI Ning, LI Xiao-Feng, DOU Tao. Crystallization Mechanism and Performance in Methanol to Olefins Reaction of SAPO-18 Molecular Sieve[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(2): 185-193. doi: 10.11862/CJIC.2019.044 shu

Crystallization Mechanism and Performance in Methanol to Olefins Reaction of SAPO-18 Molecular Sieve

1.
Institute of Fine Chemical Engineering, Chemical Engineering Institute, Taiyuan University of Technology, Taiyuan 030024, China
2.
Taiyuan Dacheng Huaneng Chemical Co. Ltd., Taiyuan 030024, China

Corresponding author: LI Xiao-Feng, lixiaofeng6008@163.com DOU Tao, dtaol@163.com
Received Date: 17 August 2018
Revised Date: 23 November 2018

Figures(11)

SAPO-18 molecular sieves with the different crystallization times were prepared by hydrothermal method, which respectively taking the pseudo-boehmite, silica sol and phosphoric acid as the aluminum source, silicon source, phosphorus source, and N, N-diisopropylethylamine as the template. The samples at different crystallization times and its MTO (methanol to olefins) catalytic performance were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), NH₃-TPD, ²⁹Si MAS NMR, ²⁷Al MAS NMR, FT-IR and other methods. The characterization results combined with the catalytic performance of MTO indicated that the growth process of SAPO-18 molecular sieve in the hydrothermal system could be divided into three stages:initial crystallization (≤ 2 h), rapid growth (6~12 h) and stable growth (1~3 d). In the early stage of crystallization, only a small amount of silicon enter the Al(PO)₄ intermediates. The silicon atoms then enter the Al(PO)₄ intermediates and SAPO-18 crystal, and replace phosphorus and aluminum atoms. SMⅡ mechanism is as the priority and SMⅢ mechanism is as the auxiliary pole in the fast growing period. The two substitution mechanisms of growth stabilization are in the opposite order.
- SAPO-18,
- crystallization mechanism,
- hydrothermal synthesis,
- methanol-to-olefins
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沈阳化工大学材料科学与工程学院沈阳 110142