abstract |
The present invention relates to crystalline MCM-22 family molecular sieves in the form of platelet aggregates, wherein more than 50% by weight of the molecular sieve has a crystal diameter of greater than 1 μm as measured by SEM. In the crystalline MCM-22 family molecular sieve of the present invention, the platelet aggregate form is in the form of a rosette matrix or a multilayered plate. |