Methods of producing isomerization catalysts

Patent metadata

Field	Value
Publication number	US-11311869-B2
Application number	US-201916701829-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 3, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Methods of producing an isomerization catalyst include preparing a catalyst precursor solution, hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant, and calcining the magnesium oxide precipitant to produce the isomerization catalyst. The catalyst precursor solution includes at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide. Methods of producing 1-butene from a 2-butene-containing feedstock with the isomerization catalyst are also disclosed.

First claim

What is claimed is:

1. A method of producing an isomerization catalyst, the method comprising:
preparing a catalyst precursor solution comprising at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide;
hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant; and
calcining the magnesium oxide precipitant to produce the isomerization catalyst.

2. The method of claim 1 , where a molar ratio of the magnesium precursor to the hydrolyzing agent in the catalyst precursor solution is from 1:10 to 1:1.

3. The method of claim 1 , where a molar ratio of the magnesium precursor to cetrimonium bromide in the catalyst precursor solution is from 1:0.01 to 1:0.1.

4. The method of claim 1 , further comprising adjusting a pH of the catalyst precursor solution.

5. The method of claim 4 , where the pH of the catalyst precursor solution is adjusted to a pH of from 3 to 7.

6. The method of claim 4 , where the pH of the catalyst precursor solution is adjusted to a pH of from 8 to 12.

7. The method of claim 1 , where hydrothermally treating the catalyst precursor solution comprises heating the catalyst precursor solution to a temperature of from 100° C. to 140° C. for a duration of from 48 hours to 96 hours.

8. An isomerization catalyst produced by the method of claim 1 , where the average particle size of the isomerization catalyst is from 30 nm to 50 nm.

9. The isomerization catalyst of claim 8 , where the surface area of the isomerization catalyst is from 100 m 2 /g to 300 m 2 /g.

10. A method of producing 1-butene from a 2-butene-containing feedstock, the method comprising:
contacting the 2-butene-containing feedstock with an isomerization catalyst to produce an isomerization reaction effluent comprising 1-butene, the isomerization catalyst prepared by a method comprising:
preparing a catalyst precursor solution comprising at least a magnesium precursor, a hydrolyzing agent, and cetrimonium bromide;
hydrothermally treating the catalyst precursor solution to produce a magnesium oxide precipitant; and
calcining the magnesium oxide precipitant to produce the isomerization catalyst.

11. The method of claim 10 , where contacting the 2-butene-containing feedstock with the isomerization catalyst causes the isomerization of at least a portion of 2-butene in the 2-butene-containing feedstock.

12. The method of claim 10 , where a molar ratio of the magnesium precursor to the hydrolyzing agent in the catalyst precursor solution is from 1:10 to 1:1.

13. The method of claim 10 , where a molar ratio of the magnesium precursor to cetrimonium bromide in the catalyst precursor solution is from 1:0.01 to 1:0.1.

14. The method of claim 10 , further comprising adjusting the pH of the catalyst precursor solution.

15. The method of claim 14 , where the pH of the catalyst precursor solution is adjusted to a pH of from 3 to 7.

16. The method of claim 14 , where the pH of the catalyst precursor solution is adjusted to a pH of from 8 to 12.

17. The method of claim 10 , where hydrothermally treating the catalyst precursor solution comprises heating the catalyst precursor solution to a temperature of from 100° C. to 140° C. for a duration of from 48 hours to 96 hours.

18. The method of claim 10 , where calcining the catalyst precipitant comprises heating the catalyst precipitant to a temperature of from 450° C. to 650° C. for a duration of from 1 hour to 10 hours.

19. The method of claim 10 , where the surface area of the isomerization catalyst is from 100 m 2 /g to 300 m 2 /g.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alghannam Afnan
• Shaikh Sohel K
• Khokhar Munir D

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J35/30

  characterised by their physical properties · CPC title