Titanium-aluminum-silicon-oxide molecular sieve compositions and process for preparing the same
AssigneeUnion Carbide Corporation
InventorsBrent M. T. 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.
Claims14
Crystalline molecular sieves having chemical composition in the for 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 molar amount 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, F, E and D of FIG. 1 and having a characteristic x-ray powder diffraction pattern selected from the group consisting of Table V, or Table VII, or Table XI or Table XVIII.
Process for preparing crystalline molecular sieves having chemical composition in the 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 molar amount 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 titaniium, 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,F,E, and D of FIG. 1, said sieves having a characteristic X-ray powder diffraction pattern selected from the group consisting of Table V, Table VII, Table XI and Table XVIII, comprising the step of providing at an effective temperature and for an effective time a reaction mixture composition expressed in terms of molar oxide ratios as follows:
- aR:(Ti.sub.x Al.sub.y Si.sub.z)O.sub.2 :b H.sub.2 O
- wherein "R", is an organic templating agent;
- "a" is an effective amount of "R";
- "b" has a value of from greater than zero to about 5000;
- and "x", "y" and "z" represent the mole fractions of titanium, aluminum and silicon, respectively, in the mR:(Ti.sub.x Al.sub.y Si.sub.z)O.sub.2 constituent, and each has a value of at least 0.01.
Dependencies are inferred from the claim text.