Chabazite-containing molecular sieve, its synthesis and its use in the conversion of oxygenates to olefins

A method of synthesizing a crystalline material comprising a CHA framework type molecular sieve and having 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 about 0.5, the method comprising:
• (a) preparing a reaction mixture capable of forming said material, said mixture comprising a source of water, a source of an oxide of a tetravalent element Y and optionally a source of an oxide of a trivalent element X;
• (b) maintaining said reaction mixture under conditions sufficient to form crystals of said crystalline material comprising stacking faults or at least one intergrown phase of a CHA framework type molecular sieve and an AEI framework type molecular sieve;
• and
• (c) recovering said crystalline material from (b).

A method of synthesizing a crystalline material comprising at least a CHA framework type molecular sieve and comprising YO2, wherein Y is a tetravalent element, and optionally X2O3, wherein X is a trivalent element, the method comprising:

• (a) preparing a reaction mixture comprising a source of water, a source of the tetravalent clement Y, optionally a source of the trivalent element X, and an organic directing agent (R) comprising at least one first organic directing agent for directing the formation of a CHA framework type material and at least one second organic directing agent for directing the formation of an AEI structure type material, said first and second directing agents being different and the first directing agent comprising a multi-cyclic amine or ammonium compound;
• (b) maintaining said reaction mixture under conditions sufficient to form crystals of said material;
• and
• (c) recovering said crystalline material from step (b).

A process for producing olefins comprising the step of contacting an organic oxygenate compound under oxygenate conversion conditions with a catalyst comprising a porous crystalline material substantially free of framework phosphorus and comprising a CHA framework type molecular sieve with stacking faults or at least one intergrown phase of a CHA framework type molecular sieve and an AEI framework type molecular sieve, 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 about 0.5.