Abstract
Two-dimensional aluminophosphate is an important precursor of phosphate-based zeolites; a new Sun Yat-sen University No. 6 (SYSU-6) with |Hada|2[Al2(HPO4)(PO4)2] has been synthesized in the hydrothermal synthesis with organic structure-directing agent (OSDA) of N,N,3,5-tetramethyladamantan-1-amine. In this paper, SYSU-6 is characterized by single-crystal/powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, transmission electron microscopy, infrared and UV Raman spectroscopy, solid-state 27Al, 31P and 13C magic angle spinning (MAS) NMR spectra, and elemental analysis. The single-crystal X-ray diffraction structure indicates that SYSU-6 crystallized in the space group P21/n, with a = 8.4119(3), b = 36.9876(12), c = 12.5674(3), α = 90°, β = 108.6770(10)°, γ = 90°, V = 3704.3(2) Å3, Z = 4, R = 5.12%, for 8515 observed data (I > 2σ(I)). The structure has a new 4,12-ring layer framework topology linked by alternating AlO4 and PO4 tetrahedra. The organic molecules reside between the layers and are hydrogen-bonded to the inorganic framework. The new type of layer provides a greater opportunity to construct zeolite with novel topology.
Highlights
Following the discovery of microporous aluminophosphates (AlPO) [1], there has been considerable interest in developing new aluminophosphate compounds with novel framework structures because of their potential application in catalysis, adsorption, and separation
As early as 2003, Yu et al [5,6] provided an excellent review of the rich structure chemistry of aluminophosphate including 3D neutral open framework, anionic open framework, low-dimensional anionic framework
The peak positions of both patterns were in agreement with each other, suggesting the phase purity of the as-synthesized compound
Summary
Following the discovery of microporous aluminophosphates (AlPO) [1], there has been considerable interest in developing new aluminophosphate compounds with novel framework structures because of their potential application in catalysis, adsorption, and separation. Among AlPObased molecular sieves, 2-dimensional (2-D) layered structures are significant since they have more accessible surfaces in the applications [2]. They can be used as precursors to synthesize. As early as 2003, Yu et al [5,6] provided an excellent review of the rich structure chemistry of aluminophosphate including 3D neutral open framework, anionic open framework, low-dimensional anionic framework. The structural and compositional richness of AlPOs is attributed to the diverse coordination of Al and P atoms.
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