US Patent 7785554 Process for manufacture of silicoaluminophosphate molecular sieves

A process for manufacturing a silicoaluminophosphate molecular sieve comprising at least one intergrown phase of AEI and CHA framework types, the process comprising the steps of (a) combining at least one silicon source, at least one phosphorus source, at least one aluminum source, and at least one structure-directing-agent (R) to form a mixture; and (b) treating the mixture at crystallization conditions sufficient to form the silicoaluminophosphate molecular sieve, wherein the mixture prepared in step (a) has a molar composition of:(n)SiO2/Al2O3/(m)P2O5/(x)R/(y)H2Owherein n ranges from about 0.005 to about 0.6, m ranges from about 0.6 to about 1.2, x ranges from about 0.5 to about 0.99, and y ranges from about 10 to about 40.