Catalyst systems that include metal oxide co-catalysts for the production of propylene

Patent metadata

Field	Value
Publication number	US-11242299-B2
Application number	US-201816156634-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Oct 10, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

Embodiments of methods of synthesizing a metathesis catalyst system, which include impregnating tungsten oxide on silica support in the presence of a precursor to produce a base catalyst; calcining the base catalyst; impregnating a metal oxide co-catalyst comprising a metal oxide onto the surface of the base catalyst to produce a doped catalyst; and calcining the doped catalyst to produce a metathesis catalyst system. Further embodiments of processes for the production of propylene, which include contacting a hydrocarbon feedstock comprising a mixture of 1-butene and 2-butene with embodiments of the metathesis catalyst system to produce, via metathesis conversion, a product stream comprising propylene.

First claim

What is claimed is:

1. A method of synthesizing a metathesis catalyst system comprising:
impregnating a metal oxide onto a large pore silica support in a presence of a precursor to produce a base catalyst comprising a metal oxide;
calcining the base catalyst at a first temperature for a first time period and a second temperature for a second time period;
impregnating from about 0.5 wt. % to about 2.5 wt. % of a metal oxide co-catalyst, based on a total weight of the metathesis catalyst system, onto the base catalyst to produce a doped catalyst, wherein the metal oxide co-catalyst comprises Ce, Ni, or both Ce and Ni; and
calcining the doped catalyst at a third temperature for a third time period and a fourth temperature for a fourth time period to produce the metathesis catalyst system.

2. The method of claim 1 , wherein the large pore silica support comprises an amorphous silica.

3. The method of claim 1 , wherein the base catalyst comprises from about 8 wt. % to about 12 wt. % tungsten oxide, based on a total weight of the base catalyst.

4. The method of claim 1 , wherein the precursor comprises ammonium metatungstate hexahydrate.

5. The method of claim 1 , wherein the metathesis catalyst system has one or more of a surface area of about 400 m 2 /g to about 800 m 2 /g, a pore size distribution of about 3 nm to about 40 nm, and a total pore volume of at least 0.700 cm 3 /g to about 2.5 cm 3 /g.

6. The method of claim 1 , wherein the metal oxide co-catalyst comprises Ce.

7. The method of claim 1 , wherein the metal oxide co-catalyst comprises Ni.

8. The method of claim 1 , wherein the first temperature and the third temperature are 250° C.

9. The method of claim 1 , wherein the second temperature and the fourth temperature are 550° C.

10. The method of claim 1 , wherein the first time period and the third time period are 2 hours.

11. The method of claim 1 , wherein the second time period and the fourth time period are 8 hours.

12. A method of synthesizing a metathesis catalyst system comprising:
impregnating a metal oxide onto a large pore silica support in a presence of a precursor to produce a base catalyst comprising the metal oxide, wherein the large pore silica support comprises an amorphous silica;
calcining the base catalyst at a first temperature for a first time period and a second temperature for a second time period;
impregnating from about 0.5 wt. % to about 2.5 wt. % of a metal oxide co-catalyst, based on a total weight of the metathesis catalyst system, onto the base catalyst to produce a doped catalyst, wherein the metal oxide co-catalyst comprises Ce, Ni, or both Ce and Ni; and
calcining the doped catalyst at a third temperature for a third time period and a fourth temperature for a fourth time period to produce the metathesis catalyst system; and

wherein the metathesis catalyst system has one or more of a surface area of about 400 m 2 /g to about 800 m 2 /g, a pore size distribution of about 3 nm to about 40 nm, and a total pore volume of at least 0.700 cm 3 /g to about 2.5 cm 3 /g.

13. The method of claim 12 , wherein the base catalyst comprises from about 8 wt. % to about 12 wt. % tungsten oxide, based on a total weight of the base catalyst.

14. The method of claim 12 , wherein the precursor comprises ammonium metatungstate hexahydrate.

15. The method of claim 12 , wherein the metal oxide co-catalyst comprises Ce.

16. The method of claim 12 , wherein the metal oxide co-catalyst comprises Ni.

Assignees

• Saudi Arabian Oil Co
• Aramco Services Co

Inventors

• Khokhar Munir D
• Alalouni Mohammed R
• Sulais Noor A
• Hanna Brian
• Shaikh Sohel K

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/80

  characterised by their amorphous structures · CPC title

• B01J35/70

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

• B01J37/0205

  in several steps · CPC title

• C07C11/06

  Propene · CPC title