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

Patent metadata

Field	Value
Publication number	US-11242300-B2
Application number	US-201916522142-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
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; 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 process for a production of propylene comprising:
contacting a hydrocarbon feedstock comprising a mixture of 1-butene and 2-butene with a metathesis catalyst system to produce the propylene;
wherein the metathesis catalyst system is produced by:
impregnating a metal oxide onto a large pore silica support in a presence of a precursor to produce a base catalyst;
calcining the base catalyst at a first temperature for a first time period and a second temperature for a second time period;
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 the 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 a 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 process of claim 1 , wherein the hydrocarbon feedstock comprises more 2-butene than 1-butene.

3. The process of claim 1 , further comprising contacting the hydrocarbon feedstock with the metathesis catalyst system at a temperature greater than 400 degrees Celsius (° C.).

4. The process of claim 1 , further comprising contacting the hydrocarbon feedstock with the metathesis catalyst system at a temperature from about 450° C. to about 550° C.

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

6. The process of claim 1 , wherein the metathesis catalyst system has 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.

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

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

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

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

Assignees

• Saudi Arabian Oil 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

• B01J37/34

  Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves {; Ionic sputtering; Flame or plasma spraying; Particle radiation} · CPC title