Heteroatom-doped zeolites for bifunctional catalytic applications

Patent metadata

Field	Value
Publication number	US-11590481-B2
Application number	US-202117349989-A
Country	US
Kind code	B2
Filing date	Jun 17, 2021
Priority date	Jun 17, 2021
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

Provided herein are methods for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock. The present catalysts comprise a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cerium and/or cobalt, and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof.

First claim

We claim:

1. A method for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock, wherein the catalyst comprises a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cobalt, and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof, the hydrocarbon feedstock comprises C 5 -C 30 normal paraffins and/or C 5 -C 30 monobranched paraffins and the heteroatom-doped Beta zeolite is selective for n-heptane conversion, wherein the catalyst further comprises between 5 wt. % and 25 wt. % tungsten, between 40 wt. % and 70 wt. % zirconium, and a metal oxide binder.

2. The method of claim 1 , wherein the heteroatom-doped Beta zeolite further comprises a molar ratio of SiO 2 to the framework/extra-framework oxide greater than 10.

3. The method of claim 1 , wherein the heteroatom-doped Beta zeolite further comprises a molar ratio of SiO 2 to Al 2 O 3 of greater than 8.

4. The method of claim 1 , wherein the group VIII or VIB metal is Pt.

5. The method of claim 1 , wherein the catalyst comprises 0.1 wt. % to 1.5 wt. % Pt.

6. The method of claim 1 , wherein the hydrocarbon feedstock contacts the catalyst under one or more isomerization conditions.

7. The method of claim/wherein the one or more isomerization conditions comprise a temperature from 100° C. to 450° C., a pressure from 0 psig to 1000 psig, a WHSV from 0.1 hr −1 to 10 hr −1 , and/or a hydrogen/hydrocarbon mole ratio from about 0.1 to about 100.

8. The method of claim 1 , wherein the hydrocarbon feedstock comprises n-pentane, n-hexane, and/or n-heptane.

9. The method of claim 8 , wherein the hydrocarbon feedstock further comprises a naphthene and/or one or more aromatic compounds.

10. A method for hydroisomerization of a hydrocarbon feedstock comprising contacting the hydrocarbon feedstock with hydrogen and a catalyst to yield a hydrocarbon product having an increase in branched hydrocarbons relative to the hydrocarbon feedstock, wherein the catalyst comprises a heteroatom-doped Beta zeolite having a trivalent cation as a framework metal oxide, an extra-framework species comprised of cerium and from 0.01 to 1.5 wt. % of a group VIII or VIB metal, or a combination thereof, the hydrocarbon feedstock comprises C 5 -C 30 normal paraffins and/or C 5 -C 30 monobranched paraffins and the heteroatom-doped Beta zeolite selectively converts C 5 , C 6 and C 7 in the hydrocarbon feedstock.

Assignees

• Exxonmobil Technology & Engineering Company
• Exxonmobil Tech & Engineering Company

Inventors

• Iida Takayuki
• Dakka Jihad M
• Carcuffe Brandon M
• Peters Aaron

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/77

  Compounds characterised by their crystallite size · CPC title

• B01J29/7615

  Zeolite Beta · CPC title

• B01J29/7215

  Zeolite Beta · CPC title