Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1988-06-15
1994-12-20
McFarlane, Anthony
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423305, 4233271, 502208, 502213, 502214, C01B 2512, B01J 2902
Patent
active
053744110
ABSTRACT:
Crystalline aluminumphosphate compositions having three-dimensional microporous crystal framework structures whose chemical composition expressed in terms of mole ratios is Al.sub.2 O.sub.3 :1.0.+-.P.sub.2 O.sub.5 are disclosed. These compositions have an X-ray diffraction pattern characterized by d spacings at less than about 40 degrees two-theta as measured using copper K-alpha radiation that are substantially as shown in Table 1. The compositions can further comprise a structure-directing agent. Preparation is by admixing an aluminum source, a phosphorus source and 10-100 moles of water per mole of Al.sub.2 O.sub.3 to form a precursor mixture, admixing the precursor mixture with the structure-directing agent to form a reaction mixture, and reacting the reaction mixture under conditions such that an aluminumphosphate composition of the given X-ray diffraction pattern is formed. Metal substituted aluminumphosphate compositions having an X-ray pattern with the same characterizing d spacings can also be prepared such that oxides of one or more metals are also incorporated in the oxide lattice. Among the metals suitable for substitution are silicon, magnesium, zinc, tin, zirconium, titanium, cobalt, and mixtures thereof.
Adsorption data shows that the compositions are useful as molecular sieves, having intracrystalline micropores capable of admitting molecules having kinetic diameters of from about 3 to about 14 Angstroms.
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Davis Mark E.
Garces Juan M.
Montes de Correa Maria Del C.
Saldarriaga Carlos H.
McFarlane Anthony
The Dow Chemical Company
Tribble Barbara J.
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