Patent ID: 7498475

Claim:
A method for converting an oxygenate feedstock to olefin, comprising: contacting a physical mixture of molecular sieves with an oxygenate feedstock, the mixture comprising: a first molecular sieve having an activity K A and a selectivity S A ; and a second molecular sieve having an activity K B and a selectivity S B , wherein K A /K B is at least 1.5, S A/ S B is less than 1, and the molecular sieves are individually selected from the group consisting of silicoaluminophosphate molecular sieves, silicoaluminate molecular sieves, and metalloaluminophosphate molecular sieves, and wherein at least one of the molecular sieves is a silicoaluminophosphate molecular sieve selected from the group consisting of SAPO-34 and SAPO-18.