Patent ID: 7314964

Claim:
A process for selective catalytic naphtha cracking to ethylene and propylene comprising contacting a naphtha feedstock with a catalyst at reaction conditions to produce ethylene and propylene, the catalyst comprising a layered molecular sieve comprising an inner core having pores made of 8 or 10 membered rings having a first three dimensional framework structure, and an outer layer having pores made of 10 membered rings having a second three dimensional framework structure, said inner core comprises a zeolite selected from the group consisting of wenkite, chabazite, dachiardite, erionite, zeolite A, ZK-4, epistilbite, laumontite, wienebeneite, EU-1, UZM-5, UZM-9, UZM-12 and mixtures thereof and said outer layer comprises at least one layer comprising a zeolite selected from the group consisting of ferrierite, ZSM-22, ZSM-23, ZSM-50, ZSM-57, ZSM-11, ZSM-5, NU-87, clinoptilolite, and mixtures thereof wherein the pores in the second structure overlay the pores in the first structure.