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

Patent metadata

Field	Value
Publication number	US-10961171-B2
Application number	US-201816156616-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Oct 10, 2018
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

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; dispersing a solid metal-based co-catalyst 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 and a precursor onto a silica support a precursor to produce a base catalyst;
calcining the base catalyst;
dispersing a solid metal-based co-catalyst onto the base catalyst to produce a doped catalyst; 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 a metathesis catalyst system;
wherein the metathesis catalyst system comprises from about 1 wt.% to about 2 wt.% of the solid metal-based co-catalyst, based on the total weight of the metathesis catalyst system; and
wherein the solid metal-based co-catalyst is selected from the group consisting of PdCl 2 , gamma-Al 2 O 3 , and combinations thereof.

2. The method of claim 1 , wherein the metal oxide is tungsten oxide.

3. The method of claim 1 , wherein the base catalyst comprises from about 8 wt. % to about 12 wt. % of tungsten oxide, based on the 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 a surface area of about 400 m 2 /g to about 800 m 2 /g.

6. The method of claim 1 , wherein the metathesis catalyst system has a pore size distribution of about 3 nm to about 40 nm.

7. The method of claim 1 , wherein the metathesis catalyst system has a total pore volume of at least 0.700 cm 3 /g to about 2.5 cm 3 /g.

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.

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

• B01J21/04

  Alumina · CPC title

• B01J37/0207

  Pretreatment of the support · CPC title