Hollow SAPO-34 Cubes with Hierarchically Organized Internal Structure

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• 作者：Jie Gong ; Fei Tong ; Xiaobo Ji ; Changfeng Zeng ; Chongqing Wang ; Yinong Lv ; Lixiong Zhang
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：August 6, 2014
• 年：2014
• 卷：14
• 期：8
• 页码：3857-3863
• 全文大小：371K
• ISSN：1528-7505

文摘

We herein report novel hollow SAPO-34 cubes with a hierarchical internal structure. They are prepared from dry gels containing gelatin by a vapor-phase transport method. Microscopic characterization reveals that the cubes are constructed by symmetrically packed four two-top-point truncated octahedrons encapsulated by dense crystalline shells, exhibiting a structure-in-structure formation. The cubes show either +-shaped or the butterfly like X-shaped black spots on their faces under light. Investigation of the formation process of the hollow SAPO-34 cubes demonstrates a surface to core crystal growth route, which has not been found in vapor-phase transport synthesis of zeolites. A possible formation mechanism is proposed.