NDLI: Hydrothermal Synthesis of Pencil-like SAPO-5 and Observation of Its Reversed Crystal-Growth Process

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Hydrothermal Synthesis of Pencil-like SAPO-5 and Observation of Its Reversed Crystal-Growth Process

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Ming Zeng, Changfeng Zhang, Lixiong Yang, Qing
Description	Author Affiliation: Yang Q ( State Key Laboratory of Materials-Oriented, Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, No 5 Xin Mofan Rd., Nanjing 210009, PR China.)
Abstract	SAPO-5 with a novel hexagonal pencil-like morphology was hydrothermally synthesized from hydrogels that contain triethylamine and high concentrations of acetic acid at 180 °C for 48 h. The effect of the acetic acid concentration was examined and indicated that usage of a high concentration of acetic acid is crucial to the synthesis of SAPO-5 with a pencil-like morphology. The time-dependent growth process of novel SAPO-5 was observed by scanning electron microscopy with the aid of acid treatment to remove the amorphous materials for clearer observation. The samples were also characterized by X-ray diffraction and Fourier-transform infrared spectroscopy. The results show that the crystal growth at the early stage follows the reversed crystal-growth route. First, the crystallization occurs on the surface of the aggregated amorphous ellipsoidal particles to form a hexagonal prism crystal shell with the encapsulation of amorphous materials. Then, the amorphous materials wrapped inside start to grow to a hexagonal prism inside the hollow larger hexagonal prism shell. Finally, the interior hexagonal prism continues to grow to the two ends with its length beyond that of the larger one by means of the Ostwald ripening process, thus forming the pencil-like crystal.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	1
Volume Number	19
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2013-01-02
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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Reversed Crystal Growth of RHO Zeolitic Imidazolate Framework (ZIF)

Hydrothermal Synthesis of Pencil-like SAPO-5 and Observation of Its Reversed Crystal-Growth Process

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