Acidic catalyst

Patent metadata

Field	Value
Publication number	US-11376573-B2
Application number	US-202016791554-A
Country	US
Kind code	B2
Filing date	Feb 14, 2020
Priority date	Apr 21, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Methods of preparing an acidic catalyst are disclosed that include heating a metal halide to produce a vapor phase metal halide, contacting an initial support material with the vapor phase metal halide in a reaction vessel causing a first chemical reaction and producing an intermediate acidic catalyst, contacting the intermediate acidic catalyst with HBr causing a second chemical reaction and producing an acidic catalyst product which is both more acidic than the intermediate acidic catalyst and more acidic than the initial support material.

First claim

What is claimed is:

1. A method of preparing an acidic catalyst comprising:
a. heating a metal halide to produce a vapor phase metal halide;
b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
e. contacting the intermediate acidic catalyst with HBr thereby causing a second chemical reaction and thereby producing an acidic catalyst product;
f. wherein the acidic catalyst product is more acidic than the intermediate acidic catalyst;
g. wherein the acidic catalyst product is more acidic than the initial support material; and
h. wherein the HBr is gas phase HBr.

2. The method of preparing an acidic catalyst of claim 1 wherein the second chemical reaction takes place at room temperature.

3. The method of preparing an acidic catalyst of claim 1 wherein the second chemical reaction takes place between 50 and 200° C.

4. The method of preparing an acidic catalyst of claim 1 wherein the metal halide is aluminum trichloride and the initial support material is silica gel.

5. The method of preparing an acidic catalyst of claim 1 wherein the metal halide is aluminum tribromide and the initial support material is MCM-41.

6. The method of preparing an acidic catalyst of claim 1 wherein the metal halide is aluminum tribromide and the initial support material is SBA-15.

7. The method of preparing an acidic catalyst of claim 1 wherein the metal halide is aluminum tribromide and the initial support material is ZSM-5.

8. The method of preparing an acidic catalyst of claim 1 wherein the initial support material is MCM-41.

9. The method of preparing an acidic catalyst of claim 1 wherein the initial support material is SBA-15.

10. The method of preparing an acidic catalyst of claim 1 wherein the initial support material is ZSM-5.

11. A method of preparing an acidic catalyst comprising:
a. heating a metal halide to produce a vapor phase metal halide;
b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
e. contacting the intermediate acidic catalyst with between 0.1% and 20% gas phase HBr in an inert gas thereby causing a second chemical reaction and thereby producing an acidic catalyst product.

12. The method of preparing an acidic catalyst of claim 11 wherein the metal halide is aluminum trichloride and the initial support material is silica gel.

13. The method of preparing an acidic catalyst of claim 11 wherein the initial support material is MCM-41.

14. The method of preparing an acidic catalyst of claim 11 wherein the initial support material is SBA-15.

15. The method of preparing an acidic catalyst of claim 11 wherein the initial support material is ZSM-5.

16. A method of preparing an acidic catalyst comprising:
a. heating a metal halide to produce a vapor phase metal halide;
b. contacting an initial support material with the vapor phase metal halide in a reaction vessel thereby causing a first chemical reaction and thereby producing an intermediate acidic catalyst;
c. wherein the initial support material is selected from an aluminum oxide based catalyst and a silicon oxide based catalyst;
d. wherein the vapor phase metal halide is selected from aluminum trichloride and aluminum tribromide;
e. contacting the intermediate acidic catalyst with HBr thereby causing a second chemical reaction and thereby producing an acidic catalyst product;
f. wherein the HBr is gas phase HBr; and
g. wherein the heating of the metal halide to produce the vapor phase metal halide and the contacting the intermediate acidic catalyst with HBr are separate sequential steps.

17. The method of preparing an acidic catalyst of claim 16 wherein the metal halide is aluminum trichloride and the initial support material is silica gel.

18. The method of preparing an acidic catalyst of claim 16 wherein the initial support material is MCM-41.

19. The method of preparing an acidic catalyst of claim 16 wherein the initial support material is SBA-15.

20. The method of preparing an acidic catalyst of claim 16 wherein the initial support material is ZSM-5.

Assignees

• Spivey James J
• Ding Kunlun
• Kanitkar Swarom
• Univ Louisiana State

Inventors

• Spivey James J
• Ding Kunlun
• Kanitkar Swarom

Classifications

• B01J37/0209

  involving a reaction between the support and a fluid · CPC title

• B01J29/70 Primary

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• C07C5/2708

  with crystalline alumino-silicates, e.g. molecular sieves · CPC title

• C07C2/76

  by condensation of hydrocarbons with partial elimination of hydrogen · CPC title

• C07C5/2705

  with metal oxides · CPC title