کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
74572 49095 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and structure of AlPO4-9: An unacquainted member in the family of microporous aluminophosphates
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Synthesis and structure of AlPO4-9: An unacquainted member in the family of microporous aluminophosphates
چکیده انگلیسی

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.

Figure optionsDownload 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 147, Issue 1, January 2012, Pages 68–72
نویسندگان
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