Synthesis and Characterization of a Family of Amine-Intercatalated Lamellar Aluminophosphates from Alcoholic System
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- 作者：Qiuming Gao ; Jiesheng Chen ; Ruren Xu ; and Yong Yue
- 刊名：Chemistry of Materials
- 出版年：1997
- 出版时间：February 1997
- 年：1997
- 卷：9
- 期：2
- 页码：457 - 462
- 全文大小：194K
- 年卷期：v.9,no.2(February 1997)
- ISSN：1520-5002
文摘
A family of lamellar aluminophosphates designatedAPO-Ln (L stands for lamellar and n= 6, 8, 10, 12, the number of carbon atoms for the occludedtemplate molecules) wassynthesized from a mixture of phosphoric acid, aluminumtriisopropoxide, ethylene glycoland an unbranched primary alcohol in the presence of an amine as thestructure-directingtemplate. The compounds were characterized by X-ray powderdiffraction, scanning electronmicroscopy, MAS NMR spectroscopy, differential thermal, andthermogravimetric analyses.The inorganic layers of APO-Ln are composed ofPO4, AlO4, and AlO6 structuralunits, andthe ratio of the octahedral Al to the tetrahedral Al in theas-synthesized compounds is about1:1. APO-Ln exhibit a distinct weight loss when treatedat elevated temperatures, and upondehydration they adsorb a considerable amount of water.Dehydration-rehydration for APO-Ln materials is reversible with the dehydrated samplescontaining almost only tetrahedrallycoordinated aluminum.