Methods of making spray-dried metathesis catalysts and uses thereof

Patent metadata

Field	Value
Publication number	US-10906026-B2
Application number	US-201816169427-A
Country	US
Kind code	B2
Filing date	Oct 24, 2018
Priority date	Oct 24, 2017
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

Provided here are catalyst compositions containing tungsten oxide on silica supports and prepared by spray drying a mixture containing a tungsten precursor, silica support, and a surfactant. Also provided here are methods of using the catalytic compositions, prepared by spray drying, in an olefin metathesis process to produce propylene from butenes.

First claim

What is claimed is:

1. A method for the preparation of a spray-dried metathesis catalyst composition, the method comprising:
combining a tungsten precursor with a surfactant to form a first mixture;
contacting the first mixture with a second mixture containing a silica support under conditions of constant stirring to form a third mixture containing the tungsten precursor loaded on the silica support, wherein the silica support comprises mesoporous silica supports, wherein the mesoporous silica support comprises SiO 2 ; and
subjecting the third mixture to a spray drying process to obtain a spray-dried metathesis catalyst composition containing tungsten oxide loaded on the silica support.

2. The method of claim 1 , wherein the silica support comprises preformed silica particles.

3. The method of claim 1 , wherein the surfactant is a poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) copolymer.

4. The method of claim 1 , wherein the tungsten precursor contains ammonium metatungstate.

5. The method of claim 1 , wherein the tungsten precursor contains ammonium paratungstate.

6. The method of claim 1 , wherein the tungsten oxide loaded on the silica support of the spray-dried metathesis catalyst ranges from 2 to 25 weight percent.

7. The method of claim 1 , wherein the tungsten oxide loaded on the silica support of the spray-dried metathesis catalyst ranges from 6 to 15 weight percent.

8. The method of claim 1 , wherein the tungsten oxide loaded on the silica support of the spray-dried metathesis catalyst is about 6 weight percent.

9. The method of claim 1 , wherein the spray drying process includes supplying the third mixture to a spray dryer at a temperature at about 250-300° C.

10. A method for production of propylene, the method comprising:
contacting a hydrocarbon feedstock containing butenes under metathesis reaction conditions with a catalyst containing tungsten oxide on a silica support to produce a product stream containing propylene, the catalyst having been prepared by a spray drying process, wherein the silica support comprises mesoporous silica supports, wherein the mesoporous silica support comprises SiO 2 ; and
fractionating the product stream to form a propylene-rich stream.

11. The method of claim 10 , wherein the hydrocarbon feedstock contains 2-butene.

12. The method of claim 10 , wherein the silica support comprises preformed silica particles.

13. The method of claim 10 , wherein the catalyst is pretreated by exposure to nitrogen gas before being contacted with the hydrocarbon feedstock.

14. The method of claim 10 , wherein the spray drying process includes contacting the silica support with a tungsten precursor in the presence of a surfactant.

15. The method of claim 14 , wherein the surfactant is a poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) copolymer.

16. The method of claim 10 , wherein the tungsten precursor contains ammonium metatungstate.

17. The method of claim 10 , wherein the tungsten precursor contains ammonium paratungstate.

18. The method of claim 10 , wherein the tungsten oxide loaded on the silica support ranges from 2 to 25 weight percent.

19. The method of claim 10 , wherein the tungsten oxide loaded on the silica support ranges from 6 to 15 weight percent.

20. The method of claim 10 , wherein the tungsten oxide loaded on the silica support is about 6 weight percent.

Assignees

• Saudi Arabian Oil Co

Inventors

• Alshafei Faisal H
• Khokhar Munir D
• Shaikh Sohel K
• Alalouni Mohammed R
• Juttu Gopal

Classifications

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title

• C07C4/06

  Catalytic processes {(C07C4/025 takes precedence)} · CPC title

• C07C11/10

  with five carbon atoms · CPC title

• C07C11/04

  Ethene · CPC title

• C07C11/06

  Propene · CPC title