Patent ID: 8182780

Claim:
A method of preparing a silicoaluminophosphate molecular sieve having a desired crystal size, the method comprising: (a) combining a source of phosphorus and a source of aluminum, with a liquid mixture medium, to form a primary mixture; (b) aging the primary mixture for an aging time and under aging conditions sufficient to allow homogenization of the primary mixture, physico-chemical interaction between the source of phosphorus and the source of aluminum, or both; (c) adding a source of silicon, N,N-dimethylcyclohexylamine organic template, and optionally additional liquid mixture medium, to the aged primary mixture to form a synthesis mixture; and (d) inducing crystallization of a silicoaluminophosphate molecular sieve, which exhibits 90% or greater CHA framework type character, from said synthesis mixture at a crystallization temperature, wherein said source of silicon comprises an organosilicate and said source of phosphorus comprises an organophosphate, and wherein the crystallized silicoaluminophosphate molecular sieve has a crystal size distribution such that its average crystal size is not greater than 5 μm.