Catalyst and process for the conversion of oxygenates to olefins

A method of producing a catalyst for use in the conversion of oxygenates to olefins, the method comprising:

• (a) preparing a synthesis mixture suitable for producing a first molecular sieve comprising a CHA framework material;
• (b) crystallizing said synthesis mixture;
• (c) recovering from said synthesis mixture a crystalline composition comprising said first molecular sieve and a second molecular sieve comprising an AFI framework type material;
• and
• (d) preparing a catalyst from the crystalline composition recovered in (c), wherein said catalyst comprises said first molecular sieve and said second molecular sieve and wherein said second molecular sieve is present in an amount up to 0.75% by weight of said first molecular sieve.

A method of producing a catalyst for use in the conversion of oxygenates to olefins, the method comprising mixing a first molecular sieve composition with a second molecular sieve composition to produce a third molecular sieve composition, wherein

• (a) the first molecular sieve composition comprises a first molecular sieve and a second molecular sieve, said first molecular sieve comprising a CHA framework type material, and said second molecular sieve comprising an AFI framework type material, said second molecular sieve being present in an amount in excess of 0.75 wt. % of the first molecular sieve;
• (b) the second molecular sieve composition comprises a molecular sieve comprising a CHA framework type material;
• and
• (c) the ratio of the first and second molecular sieve compositions being such that the third molecular sieve composition contains up to 0.75% of the second molecular sieve by weight of molecular sieve comprising a CHA framework type material.