Catalyst for production of hydrogen and process for producing hydrogen using the catalyst, and catalyst for combustion of ammonia, process for producing the catalyst and process for combusting ammonia using the catalyst

Patent metadata

Field	Value
Publication number	US-10857523-B2
Application number	US-201916299550-A
Country	US
Kind code	B2
Filing date	Mar 12, 2019
Priority date	Mar 17, 2009
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

Disclosed is a catalyst which can be used in the process for producing hydrogen by decomposing ammonia, can generate heat efficiently in the interior of a reactor without requiring excessive heating the reactor externally, and can decompose ammonia efficiently and steadily by utilizing the heat to produce hydrogen. Also disclosed is a technique for producing hydrogen by decomposing ammonia efficiently utilizing the catalyst. Specifically disclosed is a catalyst for use in the production of hydrogen, which is characterized by comprising an ammonia-combusting catalytic component and an ammonia-decomposing catalytic component. Also specifically disclosed is a catalyst for use in the production of hydrogen, which is characterized by comprising at least one metal element selected from the group consisting of cobalt, iron, nickel and molybdenum.

First claim

The invention claimed is:

1. A process for producing hydrogen from a gas containing ammonia and oxygen by using a catalyst for production of hydrogen, comprising adding the oxygen to the ammonia to obtain the gas, and bringing the gas into contact with the catalyst for production of hydrogen to produce the hydrogen,
wherein the catalyst for production of hydrogen comprises at least one metal element selected from the group consisting of cobalt, iron, and molybdenum, and
wherein the catalyst for production of hydrogen further comprises ceria-zirconia as a carrier.

2. The process for producing hydrogen according to claim 1 , wherein at least one metal element consists of cobalt.

3. The process for producing hydrogen according to claim 1 , the catalyst for production of hydrogen further comprises an alkali metal.

4. The process for producing hydrogen according to claim 1 , the catalyst for production of hydrogen further comprises an alkaline earth metal.

5. The process for producing hydrogen according to claim 1 , the catalyst for production of hydrogen further comprises rare earth element.

6. The process for producing hydrogen according to claim 1 , wherein 0.05 mol or more and less than 0.75 mol of oxygen is added to 1 mol of ammonia.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Okamura Junji
• Yoshimune Masanori
• Kirishiki Masaru
• Tsuneki Hideaki

Classifications

• B01J35/30

  characterised by their physical properties · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/733

  Perovskite-type · CPC title

• C01B3/06

  by reaction of inorganic compounds containing electro-positively bound hydrogen with inorganic reducing agents · CPC title

• B01J37/031

  Precipitation · CPC title