Nanosized CaCO3 as Hard Template for Creation of Intracrystal Pores within Silicalite-1 Crystal

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• 作者：Haibo Zhu ; Zhicheng Liu ; Yangdong Wang ; Dejin Kong ; Xiaohong Yuan ; Zaiku Xie
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：February 12, 2008
• 年：2008
• 卷：20
• 期：3
• 页码：1134 - 1139
• 全文大小：843K
• 年卷期：v.20,no.3(February 12, 2008)
• ISSN：1520-5002

文摘

The silicalite-1 crystal with intracrystal pores in the range of 50–100 nm was synthesized by using the nanosized CaCO₃ as a hard template. The nanosized CaCO₃ can be trapped into the silicalite-1 crystal during the crystallization process. By means of acid dissolution, the encapsulated nanoparticles were removed, giving rise to the intracrystal pores within the zeolite crystal. Characterization techniques including XRD, TEM, SEM, and N₂ adsorption provided the detailed information on this hierarchical pore structure. The hydroxyl groups on the surface of CaCO₃ are essential to taking the hard template effect. The secondary pores within zeolite correspond well to the morphology of the nanosized CaCO₃, which confirms the template effect of nanosized CaCO₃. These results suggest that using CaCO₃ as a hard template may be a useful approach for the synthesis of hierarchical porous materials.