Question

two examples of reforming zeolite

Answer 1

1. A method for reforming a naphtha which comprises contacting said naphtha with a noble metal/alkali metal-containing zeolite naphtha reforming catalyst said catalyst containing from about 0.1-1.0 wt % of said noble metal and an amount of said alkali metal which exceeds the cationic exchange capacity of said zeolite, a pressure of from about 0 to about 2000 psig, a temperature of about 750° F. to about 1200° F., a hydrogen to hydrocarbon molar ratio of about 0.1 to 1 to about 15 to 1 and a weight hourly spaced velocity of about 0.5 to about 20, whereby naphtha reforming activity of said catalyst is enhanced by said zeolite resulting in significantly improved C4+ gasoline yields.

2. The method of claim 1 wherein said noble metal is selected from the group consisting of Pt, Ir, Os, Pd, Rh and Ru or mixtures thereof.

3. The method of claim 1 wherein said noble metal comprises Pt.

4. The method of claim 1 wherein said noble metal comprises Pd.

5. The method of claim 1 wherein said alkali metal is selected from the group consisting of lithium, sodium, potassium, rubidium, and cesium or mixtures thereof.

6. The method of claim 1 wherein said alkali metal comprises lithium.

7. The method of claim 1 wherein said alkali metal comprises cesium.

8. The method of claim 1 wherein said catalyst is subjected to mild steaming to enhance naphtha catalyst stability.

9. The method of claim 1 wherein said pressure ranges from about 100 to about 800 psig, said temperature ranges from about 850° to 1000° F., said hydrogen to hydrocarbon molar ratio ranges from about 3 to 1 to about 7 to 1 and said weight hourly space velocity ranges from about 1 to about 3.

10. The method of claim 1 wherein said catalyst contains an inorganic oxide binder.

11. The method of claim 10 wherein said inorganic oxide binder is selected from the group consisting of alumina, silica and silica-alumina.

12. The method of claim 10 wherein said inorganic oxide binder is alumina.

13. The mixture of claim 1 wherein said naphtha is a C4+ naphtha.

14. The method of claim 1 wherein said naphtha is a C5+ naphtha.

15. The method of claim 1 wherein said naphtha is a C6+ naphtha.

16. The method of claim 1 wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-22, ZSM-23, ZSM-35, ZSM-48 and mixtures thereof or their hydrogen forms.

17. A method for reforming a C4+ naphtha comprising contacting said naphtha with a Pt-containing Li-Zeolite beta naphtha reforming catalyst having an alumina binder, at a pressure ranging from about 100 to about 800 psig, a temperature ranging from about 850° to 1000° F., a hydrogen to hydrocarbon molar ratio of from about 3 to 1 to about 7 to 1 and a weight hourly space ratio (WHSV) ranging from about 1 to 3, whereby naphtha reforming activity of said catalyst is particularly enhanced by controlling the amount of alkali metal therein.

18. The method of claim 16 wherein said catalyst is mildly steamed to enhance the naphtha reforming catalyst's stability.

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