Titanium-aluminum-silicon-oxide molecular sieve compositions
AssigneeUnion Carbide Corporation
InventorsBrent Mei Tak Lok, Bonita K. Marcus, Edith M. Flanigen
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Abstract
Titanium-aluminum-silicon-oxide molecular sieves are disclosed having use as molecular sieves and as catalyst compositions in hydrocarbon conversion and other processes. The molecular sieves have a unit empirical formula on an anhydrous basis of mR: (Ti.sub.x Al.sub.y Si.sub.z)O.sub.2 wherein "R" represents at least one organic+ emplating agent; "m" represents the moles of "R" present per mole of (Ti.sub.x Al.sub.y Si.sub.z)O.sub.2 ; and "x", "y" and "z" represent the mole fractions of titanium, aluminum and silicon, respectively, present as tetrahedral oxides. The molecular sieve is useful in separating molecular species having different degrees of polarity and/or kinetic diameters.
Claims12
Process for separating mixtures of molecular species wherein such mixtures contain molecular species having different degrees of polarity and/or kinetic diameters, comprising contacting said mixture with at least one composition selected from crystalline molecular sieves having chemical compositions in the anhydrous form represented by the unit empirical formula:
- mR:(Ti.sub.x Al.sub.y Si.sub.z)O.sub.2
- wherein "R" represents at least one organic templating agent present in the intracrystalline pore system;
- "m" represents the moles of "R" present per mole of (Ti.sub.x Al.sub.y Si.sub.z)O.sub.2 and has a value of from zero to about 0.3;
- and "x", "y" and "z" represent the mole fractions of titanium, aluminum and silicon, respectively, present as tetrahedral oxides, said mole fractions being such that they are within the compositional area defined by points A, B, C and D of FIG. 1 and having a characteristic x-ray powder diffraction pattern selected from the group consisting of Tables V, VII, XI and XVIII.
Dependencies are inferred from the claim text.