Hydrothermal Synthesis and Crystallization Mechanism of a Novel Microporous Phosphate with Submicron Holes

Abstract

Abstract: Microporous phosphate crystals with submicron holes, HAP-TAP, was hydrothermally prepared. HAP-TAP is composed of two different crystals, the hexagonal prism crystals and the layer crystals. Its morphology was characterized by abundant submicron holes (0.4-0.8 μm) distributing on the surface of hexagonal prism crystals and the layer crystals growing in the holes. The process of crystallization was investigated by scanning electronic microscopy, powderX-raydiffraction (XRD), infrared spectroscopy, and energy dispersiveX-ray(EDX) spectroscopy. The hexagonal prism single-crystal HAP was obtained by adjusting the crystallization time. The single-crystal XRD results showed that HAP is a novel microporous aluminum phosphate with a formula of Al5(OH)2(PO4)7(C2N2H10)3•0.5H2O and two-dimensional open-framework structure. EDX results showed that the layer crystals located in submicron holes were titanic aluminum phosphates.

Key words: submicron hole, microporous phosphate, hydrothermal synthesis, crystallization mechanism

ZHANG Ying;TIAN Peng;ZHOU Fan;LIU Guangyu;LIU Zhongmin*. Hydrothermal Synthesis and Crystallization Mechanism of a Novel Microporous Phosphate with Submicron Holes[J]. Chinese Journal of Catalysis, 2007, 28(11): 963-969.

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Hydrothermal Synthesis and Crystallization Mechanism of a Novel Microporous Phosphate with Submicron Holes

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