Catalyst for aromatization of alkanes having 4 to 7 carbon atoms, process of making, and process of aromatics preparation by using thereof

Patent metadata

Field	Value
Publication number	US-12290801-B2
Application number	US-202118547178-A
Country	US
Kind code	B2
Filing date	Sep 23, 2021
Priority date	Feb 25, 2021
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

The present invention relates to a catalyst for aromatization of alkanes having 4 to 7 carbon atoms, especially alkanes having carbon atoms. Said catalyst has the efficacy in the aromatics production with high conversion and high selectivity of aromatics or high yield of aromatics, wherein said catalyst comprises zeolite, at least 1 transition metal from group VIII transition metal in a range of 0.1 to 2% by weight based on the total weight of the catalyst, and at least 1 metal from group IIIA metal in a range of 0.1 to 5% by weight based on the total weight of the catalyst. Said catalyst is treated and dried with a microwave at a power in a range from 400 to 1,000 watts after step of contacting with a solution comprising at least 1 transition metal salt from group VIII transition metal and after step of contacting with a solution comprising at least 1 group IIIA metal salt. Moreover, this invention also relates to a process for preparing said catalyst and a process of aromatics preparation using said catalyst.

First claim

The invention claimed is:

1. A catalyst for aromatization of alkanes having 4 to 7 carbon atoms comprising zeolite, at least 1 transition metal from group VIII transition metal in a range of 0.1 to 2% by weight based on the total weight of the catalyst, and at least 1 metal from group IIIA metal in a range of 0.1 to 5% by weight based on the total weight of the catalyst, wherein said catalyst is prepared from a process comprising:
a) contacting a zeolite with a solution comprising at least 1 transition metal salt from group VIII transition metal to form a first mixture;
b) treating and drying the first mixture obtained from step a) with a microwave at a power in a range from 400 to 1,000 watts to form a first dried mixture;
c) contacting the first dried mixture obtained from step b) with a solution comprising at least 1 group IIIA metal salt to form a second mixture;
d) treating and drying the second mixture obtained from step c) with a microwave at a power in a range from 400 to 1,000 watts to form a second dried mixture; and
e) calcining the second dried mixture obtained from step d) at a temperature less than or equal to 650° C.

2. The catalyst according to claim 1 , wherein the zeolite is selected from ZSM-5, ZSM-11, or a mixture thereof.

3. The catalyst according to claim 2 , wherein the zeolite is ZSM-5.

4. The catalyst according to claim 1 , wherein said zeolite has a mole ratio of silica to alumina in a range from 15 to 40.

5. The catalyst according to claim 4 , wherein said zeolite has the mole ratio of silica to alumina in the range from 20 to 30.

6. The catalyst according to claim 1 , wherein the amount of the group VIII transition metal is in the range from 0.5 to 1% by weight based on the total weight of the catalyst.

7. The catalyst according to claim 1 , wherein the group VIII transition metal is platinum (Pt).

8. The catalyst according to claim 1 , wherein the amount of the group IIIA metal is in the range from 0.5 to 2% by weight based on the total weight of the catalyst.

9. The catalyst according to claim 1 , wherein the group IIIA metal is gallium (Ga).

10. The catalyst according to claim 1 , wherein at least 1 transition metal further comprises the group IVB transition metal.

11. The catalyst according to claim 10 , wherein the amount of the group IVB transition metal is in the range from 0.1 to 10% by weight based on the total weight of the catalyst.

12. The catalyst according to claim 11 , wherein the amount of the group IVB transition metal is in the range from 3 to 5% by weight based on the total weight of the catalyst.

13. The catalyst according to claim 10 , wherein the group IVB transition metal is titanium (Ti).

14. The catalyst according to claim 1 , wherein step b) and step d) are performed using the microwave at the power in the range from 600 to 900 watts.

15. The catalyst according to claim 14 , wherein step b) and step d) are performed using the microwave at the power of 800 watts.

16. The catalyst according to claim 1 , wherein step e) is performed at the temperature in a range from 400 to 600° C.

17. The catalyst according to claim 16 , wherein step e) is performed at the temperature in the range from 500 to 600° C.

18. The catalyst according to claim 1 , wherein the calcination time of step e) is from 3 to 6 hours.

19. The catalyst according to claim 1 , wherein alkanes are pentane.

20. A process of aromatics preparation from aromatization of alkanes comprising:
a) treating the catalyst according to claim 1 with gas comprising hydrogen gas at a temperature in a range from 200 to 650° C.; and
b) contacting alkanes with the catalyst obtained from step a) at the temperature in the range from 400 to 800° C.

21. The process of aromatics preparation according to claim 20 , wherein step a) is performed at the temperature in the range from 400 to 600° C.

22. The process of aromatics preparation according to claim 20 , wherein step b) is performed at the temperature in the range from 500 to 600° C.

23. The process of aromatics preparation according to claim 20 , wherein alkanes are pentane.

24. A process of catalyst preparation for aromatization of alkanes having 4 to 7 carbon atoms comprising:
a) contacting a zeolite with a solution comprising at least 1 transition metal salt from group VIII transition metal to form a first mixture, wherein the group VIII transition metal is in a range of 0.1 to 2% by weight based on the total weight of the catalyst;
b) treating and drying the first mixture obtained from step a) with a microwave at a power in a range from 400 to 1,000 watts to form a first dried mixture;
c) contacting the first dried mixture obtained from step b) with a solution comprising at least 1 group IIIA metal salt to form a second mixture, wherein the group IIIA metal is in a range of 0.1 to 5% by weight based on the total weight of the catalyst;
d) treating and drying the second mixture obtained from step c) with a microwave at a power in a range from 400 to 1,000 watts to form a second dried mixture; and
e) calcining the second dried mixture obtained from step d) at a temperature less than or equal to 650° C.

25. The process of catalyst preparation according to claim 24 , wherein the amount of the group VIII transition metal is in the range from 0.5 to 1% by weight based on the total weight of the catalyst.

26. The process of catalyst preparation according to claim 24 , wherein the group VIII transition metal is platinum (Pt).

27. The process of catalyst preparation according to claim 24 , wherein the amount of the group IIIA metal is in the range from 0.5 to 2% by weight based on the total weight of the catalyst.

28. The process of catalyst preparation according to claim 24 , wherein the group IIIA metal is gallium (Ga).

29. The process of catalyst preparation according to claim 24 , wherein the solution comprising at least 1 transition metal salt in step a) further comprises at least 1 transition metal salt from group IVB transition metal.

30. The process of catalyst preparation according to claim 29 , wherein the amount of the group IVB transition metal is in the range from 0.1 to 10% by weight based on the total weight of the catalyst.

31. The process of catalyst preparation according to claim 30 , wherein the amount of the group IVB transition metal is in the range from 3 to 5% by weight based on the total weight of the catalyst.

32. The process of catalyst preparation according to claim 29 , wherein the group IVB transition metal is titanium (Ti).

33. The process of catalyst preparation according to claim 24 , wherein the zeolite is selected from ZSM-5, ZSM-11, or a mixture thereof.

34. The process of catalyst preparation according to claim 33 , wherein the zeolite is ZSM-5.

35. The process of catalyst preparation according to claim 24 , wherein said zeolite has a mole ratio of silica to alumina in a range from 15 to 40.

36. The process of catalyst preparation according to claim 35 , wherein said zeolite has the mole ratio of silica to alumina in the range from 20 to 30.

37. The process of catalyst preparation according to claim 24 , wherein step b) and step d) are performed using the microwave at the power in the range fr

Assignees

• Ptt Global Chemical Public Co Ltd

Inventors

• Chareonpanich Metta
• Donphai Waleeporn
• Sangteantong Pariyawalee
• Wongnongwa Yutthana
• Jungsuttiwong Siriporn
• Pengpanich Sitthiphong
• Thavornprasert Kaew-Arpha

Classifications

• C07C2523/62

  with gallium, indium, thallium, germanium, tin or lead · CPC title

• C07C5/417

  of the platinum group · CPC title

• B01J2229/20

  to introduce other elements in the catalyst composition comprising the molecular sieve, but not specially in or on the molecular sieve itself · CPC title

• B01J37/346

  of microwave energy · CPC title

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title