zeolite ALPO4-5 (AFI structure)
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Zeolite ALPO4-5 (AFI structure) molecular sieve
ALPO4-5, the molecular formula is (C12H28N+)(OH-)(H2O)X(AL12P12O48), is an AFI structure. It is the most famous member of the aluminum phosphate molecular sieve family. In ALPO4-5, phosphorus-oxygen tetrahedra (PO4) and aluminum-oxygen tetrahedra (ALO4) strictly alternate on the backbone. The skeleton structure of ALPO4-5 is based on two-dimensional three-connected net layers. The fourth oxygen atom of the TO4 tetrahedron on the layer points alternately above and below the layer. The stacking of these layers in the C-axis direction forms the three-dimensional framework of ALPO4-5. It has a one-dimensional 12-membered ring channel parallel to the [001] direction, the channel size is 7.3*7.3A, and the channel wall is completely composed of 6-membered rings.
