| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 74572 | Microporous and Mesoporous Materials | 2012 | 5 Pages |
In the family of microporous aluminophosphate, AlPO4-9 is one of the members reported first in 1982. However, its structure and characteristics have not been known up to now, and this makes it a special member. In the present work, AlPO4-9 has been synthesized using piperazine as the structure-directing agent and the mixture of H2O and EG as the solvent. Structure refinement from single crystal X-ray diffraction data shows that AlPO4-9 is a material with the composition of C2H7Al5.50NO25P6. It crystallizes in the monoclinic space group C2/c (No: 15), with a = 24.230(5) Å, b = 14.026(5) Å and c = 16.197(3) Å, β = 119.87(4)°, V = 4773(2) Å3, Z = 8. The open-framework of AlPO4-9 is built of alternating corner-sharing PO4 tetrahedra and AlO4 tetrahedra (AlO6 octahedra) to construct a curved one-dimensional 8-ring channel system running along [1 0 1]. Meanwhile, the strict alternative of PO4 tetrahedra and AlO4 tetrahedra (AlO6 octahedra) results in a negative framework in AlPO4-9. Thermal stability has been determined on a thermal analyzer and by calcination. It reveals that AlPO4-9 framework is thermally stable and has a potential to be a catalytic material.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Large single crystals of AlPO4-9 molecular sieves have been synthesized. ► Structure of AlPO4-9 has been obtained from the single crystal refined. ► Bronsted acid sites in the framework of AlPO4-9 are induced.
