Patent ID: 7102051
Filing Date: 2006-09-05
Classification: B01J,C01B,C07C,C10G,Y02P

Abstract:
1. A method of making an olefin product from an oxygenate feedstock comprising: providing a template-containing crystalline silicoaluminophosphate molecular sieve having an exterior surface and an average pore size of less than or equal to 5 angstroms; contacting the template-containing molecular sieve with a silicon containing compound having a kinetic molecular diameter greater than the average pore size of the molecular sieve, thereby preventing the ingress of the compound into an interior crystal structure of the sieve; heating the molecular sieve that has been contacted with the silicon containing compound such that the exterior surface of the molecular sieve is coated with residual silica, wherein the molecular sieve coated with residual silica has a residual surface index of at least 1.5; and contacting the molecular sieve coated with residual silica with an oxygenate feedstock under conditions effective to produce an olefin product.