Patent ID: 8734758

Claim:
A method for synthesizing a molecular sieve comprising at least one tetravalent framework element and at least one trivalent or pentavalent element, comprising: a) providing a reaction mixture sufficient to synthesize the molecular sieve; b) maintaining the reaction mixture under crystallization conditions; c) monitoring at least one viscometric parameter of the reaction mixture, wherein the monitoring step comprises: (1) periodically removing a sample of the reaction mixture; cooling each sample to a pre-defined temperature; and measuring the at least one viscometric parameter of each sample; or (2) periodically removing a sample of the reaction mixture; subjecting each sample to a plurality of shear rates; recording a shear stress corresponding to each of the plurality of shear rates to provide a plurality of shear stress values; and determining a viscosity shear rate index for each sample; and d) determining an endpoint based on the monitoring of the at least one viscometric parameter.