AEI-Type zeolite, its synthesis and its use in the conversion of oxygenates to olefins
AssigneeExxonMobil Chemical Patents Inc.
InventorsGuang Cao, Karl G. Strohmaier, Hailian Li, Anil S. Guram, Robert J. Saxton, Mark T. Muraoka, Jeffrey C. Yoder, Karin Yaccato
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Abstract
A crystalline material is described that has an AEI framework type, wherein the material, in its calcined, anhydrous form, has a composition involving the molar relationship: (n)X2O3:YO2, wherein X is a trivalent element, Y is a tetravalent element n is from 0 to less than 0.01. The material is normally synthesized in a halide, typically a fluoride, medium and exhibits activity and selectivity in the conversion of methanol to lower olefins, especially ethylene and propylene.
Claims47
A crystalline material having an AEI framework type, wherein said material, in its calcined, anhydrous form, has a composition involving the molar relationship:
- (n)X2O3:YO2,
- wherein X is a trivalent element, Y is a tetravalent element and n is from 0 to less than 0.01.
A crystalline material having an AEI framework type, wherein said material, in its calcined, anhydrous form, has a composition involving the molar relationship:
- (n)X2O3:YO2,
- wherein X is a trivalent element, Y is a tetravalent element and n is from 0 to less than 0.01 and wherein said material, in its calcined form, contains from about 1 to about 100 ppm by weight of a halide.
A method of synthesizing a crystalline material having an AEI framework type and comprising YO2 and optionally X2O3 wherein X is a trivalent element and Y is a tetravalent element, the method comprising:
- (a) preparing a reaction mixture capable of forming said material, said mixture comprising a source of water, a source an oxide of the tetravalent element Y, optionally a source an oxide of the trivalent element X and an organic directing agent for directing the formation of said crystalline material;
- (b) maintaining said reaction mixture under conditions sufficient to form crystals of said crystalline material comprising a composition involving the molar relationship:
- (n)X2O3:YO2,
- where n is from 0 to less than 0.01;
- and
- (c) recovering said crystalline material from (b).
An organic conversion process comprising contacting an organic feedstock with a catalyst comprising a crystalline material having an AEI framework type and comprises a composition involving the molar relationship:
- (n)X2O3:YO2,
- wherein X is a trivalent element, Y is a tetravalent element and n is from 0 to less than 0.01.
Dependencies are inferred from the claim text.