Alkali metal doped molybdenum carbide supported on gamma-alumina for selective CO2 hydrogenation into CO

Patent metadata

Field	Value
Publication number	US-11266980-B2
Application number	US-201916508474-A
Country	US
Kind code	B2
Filing date	Jul 11, 2019
Priority date	Jul 15, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A method for CO2 hydrogenation via the reverse water-gas shift (RWGS) reaction using alkali metal-doped molybdenum carbide, supported on gamma alumina (A-Mo2C/γ-Al2O3, A=K, Na, Li). The A-Mo2C/γ-Al2O3 catalyst is synthesized by co-impregnation of molybdemun and alkali metal precursors onto a γ-Al2O3 support. It is then carburized to form the A-Mo2C/γ-Al2O3. Also disclosed is the related catalyst material.

First claim

What is claimed as new and desired to be protected by Letters Patent of the United States is:

1. A method for CO 2 hydrogenation via the reverse water-gas shift (RWGS) reaction for the selective formation of CO, comprising:
co-impregnating molybdenum and alkali-metal precursors onto a γ-Al 2 O 3 support, wherein the alkali metal is K, Na, or Li;
drying and calcining impregnated γ-Al 2 O 3 support;
carburizing the dried and calcined γ-Al 2 O 3 support to form A-Mo 2 C/γ-Al 2 O 3 , wherein A is K, Na, or Li; and
reacting the A-Mo 2 C/γ-Al 2 O 3 with CO 2 and H 2 to form CO.

2. The method of claim 1 , wherein the loading of Mo is in the range of 1 to 70 weight percent.

3. The method of claim 1 , wherein the loading of the alkali metal is in the range of 0.1 to 15 weight percent.

4. The method of claim 1 , wherein the carburization is performed at a temperature in the range of 400 to 1000° C.

5. The method of claim 1 , wherein the reaction is performed while applying external heat.

6. The method of claim 1 , wherein the reaction is performed at a temperature in the range of 250 to 1000° C.

7. The method of claim 1 , wherein the reaction is performed at a pressure between 0 and 350 psig.

8. The method of claim 1 , wherein the reaction is performed while flowing carbon dioxide, hydrogen gas, or any combination thereof, over the A-Mo 2 C/γ-Al 2 O 3 catalyst material.

9. The method of claim 1 , wherein the reaction is performed while applying external heat and flowing carbon dioxide, hydrogen gas, or any combination thereof, over the A-Mo 2 C/γ-Al 2 O 3 catalyst material.

10. The method of claim 1 , wherein the CO 2 hydrogenation via the RWGS reaction achieves a CO yield of 12% or greater.

11. The method of claim 1 , wherein the CO 2 hydrogenation via the RWGS reaction achieves a CO selectivity of 90% or greater.

Assignees

• Us Gov Sec Navy

Inventors

• Porosoff Marc
• Willauer Heather D

Classifications

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J27/22 Primary

  Carbides · CPC title

• B01J37/0201

  Impregnation · CPC title

• C01B32/949

  Tungsten or molybdenum carbides · CPC title

• B01J21/02

  Boron or aluminium; Oxides or hydroxides thereof · CPC title