Patent ID: 7320782

Claim:
A process for preparing a layered composition comprising an inner core and an outer layer, the outer layer comprising a molecular sieve having a three dimensional microporous framework structure and a framework composition represented by an empirical formula of: (El w Al x P y Si z )O 2 (1) where El, Al, P and Si are framework elements present as tetrahedral oxide units, “w” is the mole fraction of El and has a value from 0 to about 0.5, “x” is the mole fraction of Al and has a value from 0 to about 0.5, “y” is the mole fraction of P and has a value from 0 to about 0.5, and “z” is the mole fraction of Si and has a value from 0 to about 1, w+x+y+z=1 and “y” and “z” are not simultaneously zero, the process comprising providing at reaction conditions a slurry comprising inner core particles dispersed in a liquid comprising reactive sources of El, Al, P and Si corresponding to formula (1); intermittently adding to the slurry nutrient(s) to provide framework element(s) of the molecular sieve per formula (1), thereby forming crystals of the molecular sieve and agglomerating the crystals onto the inner core and carrying out the intermittent addition for a first time period to form a first layer of the molecular sieve on the inner core and where the inner core is selected from the group consisting of aluminas, silica-alumina, cordierite, mullite, white sand quartz, gibbsite, silica, and mixtures thereof.