Patent ID: 7597874

Claim:
A method for preparing a zeolite having a CHA framework topology, comprising the steps of: (1) preparing an aqueous reaction mixture comprising: (a) at least one active source of an oxide of a tetravalent element, (b) at least one active source of an oxide of a trivalent element, a pentavalent element, a second tetravalent element which is different from the first tetravalent element, or a mixture thereof, (c) at least one active source of an element selected from Groups 1 and 2 of the Periodic Table, (d) water as a solvent, (e) seed crystals capable of forming the CHA zeolite, and (f) a structure directing agent in an amount sufficient to form crystals of the zeolite, wherein the structure directing agent is an N,N,N-trialkyl benzyl quaternary ammonium salt represented general structural formula: wherein R 1 , R 2 and R 3 are each independently selected from the group consisting of lower alkyl groups, and A − is an anion which is not detrimental to the crystallization of the CHA zeolite; and (2) heating the reaction mixture under crystallization conditions for sufficient time to form crystals of the CHA zeolite.