Metal alloy/oxide, metal alloy/nitride composite catalyst for ammonia decomposition

Patent metadata

Field	Value
Publication number	US-2021001311-A1
Application number	US-202016920056-A
Country	US
Kind code	A1
Filing date	Jul 2, 2020
Priority date	Jul 3, 2019
Publication date	Jan 7, 2021
Grant date	—

Abstract

The present invention discloses a series of ammonia decomposition catalysts, the method of making such catalysts and the use of such catalysts. The said catalysts are made of composite metal or metal alloys supported on composite oxides or nitrides as the catalyst supports. The catalysts are useful in ammonia decomposition at various temperatures and pressures, including temperatures below 500° C. and pressures up to 30 atm.

First claim

We claim a catalyst for ammonia decomposition, which consists of:

1 . A catalyst, comprising:
a first element comprising at least one of:
cobalt, iron, chromium, manganese, and vanadium;
a second element comprising at least one of:
nickel, copper, and niobium;
a support; and a promoter; wherein the first element and the second element are combined to form at least one of a first mixture, the first mixture being at least one of:
a bimetallic nanocluster; and
an alloy;
wherein the first mixture is supported on the support, the support comprising at least one of:
a mixed oxide;
a nitride; and
a perovskite;
wherein the promoter is an alkali metal.

2 . The catalyst of claim 1 , wherein the support comprises an alkaline earth metal.

3 . The catalyst of claim 2 , wherein the alkaline earth metal comprises at least one of magnesium, calcium, strontium, and barium.

4 . The catalyst of claim 2 , wherein the support further comprises a rare earth metal.

5 . The catalyst of claim 4 , wherein the rare earth metal comprises at least one of cerium, lanthanum, praseodymium.

6 . The catalyst of claim 2 , wherein the support further comprises at least one of aluminum, zirconium, molybdenum, and titanium.

7 . The catalyst of claim 1 , wherein the alkali metal of the promoter is at least one of potassium, cesium, sodium, lithium, and rubidium.

8 . The catalyst of claim 1 , wherein:
the first mixture is the bimetallic nanocluster; the support is a mixed oxide comprising at least one of:
an alkaline earth metal and a rare earth metal; and
at least one of aluminum, zirconium, molybdenum; and titanium;
wherein the alkaline earth metal comprises at least one of:
magnesium, calcium, strontium, and barium; and

wherein the rare earth metal comprises at least one of:
cerium, lanthanum, praseodymium; and

the promoter is at least one of potassium, cesium, sodium, lithium, and rubidium.

9 . The catalyst of claim 1 , wherein the catalyst comprises the first element and the second element at a concentration between fifteen percent and eighty-five percent by mass.

10 . The catalyst of claim 1 , wherein the first element and the second element form an alloy comprising cobalt.

11 . A system for decomposing ammonia, comprising:
a catalyst; a liquid comprising ammonia; a pump; a heat exchanger for vaporizing the liquid ammonia; a reactor; and a purification unit; wherein the liquid is contained in a container, wherein the pump is configured to receive the liquid from the container and guide the liquid to a heat exchanger, wherein the heat exchanger is configured to vaporize the liquid into a vapor and feed the vapor to a reactor, wherein the reactor comprises the catalyst and is configured to decompose the vapor into a mixture comprising hydrogen and nitrogen, and wherein the reactor is configured to guide the mixture to the heat exchanger, wherein the heat exchanger is further configured to reduce a temperature of the mixture and guide the liquid to the purification unit, and wherein the purification unit is configured to separate the hydrogen from the mixture.

12 . The system of claim 11 , wherein the catalyst comprises:
a first element comprising at least one of:
cobalt, iron, chromium, manganese, and vanadium;
a second element comprising at least one of:
nickel, copper, and niobium;
a support; and a promoter; wherein the first element and the second element are combined to form at least one of a first mixture, the first mixture being at least one of:
a bimetallic nanocluster; and
an alloy;
wherein the first mixture is supported on the support, the support comprising at least one of:
a mixed oxide;
a nitride; and
a perovskite;
wherein the promoter is an alkali metal.

13 . The system of claim 12 , wherein the heat exchanger is configured to adjust the temperature of the liquid to temperatures below 500 degrees Celsius.

14 . The system of claim 12 , wherein the heat exchanger is configured to adjust the temperature of the liquid to temperatures at or above 500 degrees Celsius.

15 . The system of claim 11 , wherein the heat exchanger is configured to adjust the temperature of the liquid to temperatures below 500 degrees Celsius.

16 . The system of claim 11 , wherein the heat exchanger is configured to adjust the temperature of the liquid to temperatures at or above 500 degrees Celsius.

17 . A system, comprising:
a liquid comprising ammonia; and a catalyst comprising:
a first element comprising at least one of:
cobalt, iron, chromium, manganese, and vanadium;

a second element comprising at least one of:
nickel, copper, and niobium;

a support; and
a promoter;
wherein the first element and the second element are combined to form at least one of a first mixture, the first mixture being at least one of:
a bimetallic nanocluster; and
an alloy;

wherein the first mixture is supported on the support, the support comprising at least one of:
a mixed oxide;
a nitride; and
a perovskite;

wherein the promoter is an alkali metal.

Assignees

• Bettergy Corp
• Univ New York State Res Found

Inventors

• Wu Gang
• Mukherjee Shreya
• Tang Zhong
• Lu Bo

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• B01J37/18

  with gases containing free hydrogen · CPC title