Assembly of Sub‐Crystals on the Macroscale and Construction of Composite Building Units on the Microscale for SAPO‐34,Chemistry - An Asian Journal

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Assembly of Sub‐Crystals on the Macroscale and Construction of Composite Building Units on the Microscale for SAPO‐34
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-09-20 , DOI: 10.1002/asia.201801069
Delin Yuan _{1,

2} , Aihua Xing ₁ , Ping Miao ₁ , Qi Sun ₁ , Lishan Cui ₂ , Hui Wang ₃ , Linge Ma ₁ , FuKuo Chiang ₁ , Jiechen Kong ₁

Affiliation

The nucleation and growth of SAPO‐34 crystals with triethylamine (TEA) as a single template was monitored with ex situ time‐resolved characterization methods. The investigation focused on the evolution of the intermediate phases at different crystallization stages of SAPO‐34. The morphology transformation of the intermediate phases at different crystallization times revealed the unique self‐assembly process of the sub‐crystals. The cubic SAPO‐34 crystals can be constructed from eight pyramidal subunits. Additionally, the construction order of cha cages and double‐six‐membered ring (d6r) units in the initial crystallization stage was determined. The appearance of cha cages prior to d6r units can be attributed to the structure‐directing effect of protonated TEA, which is charge balanced with the negative charge of the framework from Si incorporation. Further analysis showed that Si species were incorporated into the framework by direct participation in the initial crystallization stage and substitution for framework P atoms during the later stage.

中文翻译：

用于SAPO-34的大规模子晶体组装和用于微型规模的复合建筑单元的构建

用异位时间分辨表征方法监测以三乙胺（TEA）为单个模板的SAPO-34晶体的成核和生长。研究集中在SAPO-34不同结晶阶段的中间相的演变。中间相在不同结晶时间的形态转变揭示了子晶体独特的自组装过程。立方SAPO-34晶体可以由八个锥体亚基构成。此外，确定了初始结晶阶段的茶笼和双六元环（d6r）单元的构造顺序。d6r之前cha笼的外观单位可以归因于质子化TEA的结构导向作用，该作用与Si掺入的骨架负电荷平衡。进一步的分析表明，硅物种是通过直接参与初始结晶阶段并在随后的阶段取代框架P原子而掺入框架的。

更新日期：2018-09-20

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