Hybrid extruded mixed zeolite catalysts for synthesis of light olefins
A catalyst for converting dimethyl ether into light olefins, including ethylene and propylene. The catalyst comprises a mixture of two zeolites, ZSM-5 and ZSM-35, intimately mixed and kept in close proximity in a porous extruded binder system. The resulting combination of zeolites demonstrates a synergistic effect with respect to the conversion of the dimethyl ether and has improved resistance to deactivation due to carbon and coke formation than the individual zeolites alone when operating in this reaction. The catalyst is used to produce ethylene and propylene from a feed mixture containing methanol, dimethyl ether and water.
1. A method of producing at least one olefin from dimethyl ether, comprising:
reacting a feed comprising dimethyl ether under catalytic conversion conditions in the presence of a composition comprising at least one catalyst particle, wherein each of said at least one catalyst particle(s) contains a ZSM-5 zeolite, a ZSM-35 zeolite, and a binder, to produce a product comprising at least one olefin.
2. The method of claim 1 wherein said feed further comprises methanol.
3. The method of claim 2 wherein said feed further comprises water.
4. The method of claim 1 wherein said at least one olefin is ethylene.
5. The method of claim 1 wherein said at least one olefin is propylene.
6. The method of claim 1 wherein said at least one olefin comprises ethylene and propylene.
7. The method of claim 1 wherein said ZSM-5 zeolite is present in an amount of from about 10 wt. % to about 95 wt. % of the total amount of zeolite in said composition.
8. The method of claim 7 wherein said ZSM-5 zeolite is present in an amount of from about 10 wt. % to about 90 wt. % of the total amount of zeolite in said composition.
9. The method of claim 8 wherein said ZSM-5 zeolite is present in an amount of from about 40 wt % to about 90 wt. % of the total amount of zeolite in said composition.
10. The method of claim 9 wherein said ZSM-5 zeolite is present in an amount of from about 55 wt. % to about 85 wt. % of the total amount of zeolite in said composition.
11. The method of claim 1 wherein said ZSM-35 zeolite is present in an amount of from about 5 wt. % to about 90 wt. % of the total amount of zeolite in said composition.
12. The method of claim 11 wherein said ZSM-35 zeolite is present in an amount of from about 10 wt. % to about 90 wt. % of the total amount of zeolite in said composition.
13. The method of claim 12 wherein said ZSM-35 zeolite is present in an amount of from about 10 wt. % to about 60 wt. % of the total amount of zeolite in said composition.
14. The method of claim 13 wherein said ZSM-35 zeolite is present in an amount of from about 15 wt. % to about 45 wt. % of the total amount of zeolite in said composition.
15. The method of claim 1 wherein said binder is selected from the group consisting of silicas, clays, aluminas, and mixtures thereof.
16. The method of claim 15 wherein said binder is a silica.
17. The method of claim 16 wherein said silica is derived from colloidal silica.
18. The method of claim 16 wherein said silica is an amorphous silica.
19. The method of claim 15 wherein said binder is a clay.
20. The method of claim 15 wherein said binder is an alumina.
21. The method of claim 20 wherein said alumina is an amorphous alumina.