Steam reforming catalyst and fuel cell system using the same

Patent metadata

Field	Value
Publication number	US-11883801-B2
Application number	US-201917056018-A
Country	US
Kind code	B2
Filing date	May 22, 2019
Priority date	Jun 20, 2018
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

A steam reforming catalyst that promotes production of hydrogen from a gas containing a hydrocarbon in the presence of steam includes a carrier and two or more catalyst metals supported on the carrier and including a first metal and a second metal. The first metal includes Ni, the second metal includes at least one of Co and Ru, and the carrier is represented by LaNbO 4 or La 1-x Sr x NbO 4 where x is in a range of 0<x≤0.12.

First claim

The invention claimed is:

1. A steam reforming catalyst that promotes production of hydrogen from a gas containing a hydrocarbon in the presence of steam, the steam reforming catalyst comprising:
a carrier; and
two or more catalyst metals supported on the carrier and including a first metal and a second metal,
wherein the first metal includes Ni,
the second metal includes at least one of Co and Ru, and
the carrier is represented by La 1-x Sr x NbO 4 where x is in a range of 0<x≤0.12.

2. The steam reforming catalyst according to claim 1 , wherein the carrier is formed of La 1-x Sr x NbO 4 where x is in a range of 0.08≤x≤0.12.

3. The steam reforming catalyst according to claim 1 , wherein the second metal includes at least Co.

4. The steam reforming catalyst according to claim 1 ,
wherein a content of the catalyst metals is 1% by mass or more and 5% by mass or less based on a total of the catalyst metals and the carrier, and
a content of the second metal is 0.15% by mass or more and 0.5% by mass or less based on the total of the catalyst metals and the carrier.

5. The steam reforming catalyst according to claim 1 , wherein the carrier is supported on a porous body.

6. The steam reforming catalyst according to claim 5 , wherein the porous body has a honeycomb structure.

7. The steam reforming catalyst according to claim 1 , wherein the hydrocarbon includes propane.

8. The steam reforming catalyst according to claim 1 , wherein the gas containing a hydrocarbon is a mixed gas containing the hydrocarbon and oxygen.

9. A fuel cell system comprising:
a fuel cell that includes
a cell structure including a cathode, an anode, and a solid electrolyte layer disposed between the cathode and the anode,
a cathode-side separator disposed on a cathode side with respect to the solid electrolyte layer,
an anode-side separator disposed on an anode side with respect to the solid electrolyte layer,
an oxidant channel which is formed between the cathode-side separator and the cathode and through which an oxidant is supplied to the cathode, and
a fuel channel which is formed between the anode-side separator and the anode and through which a fuel is supplied to the anode; and
a steam reformer that includes the steam reforming catalyst according to claim 1 .

10. The fuel cell system according to claim 9 , wherein an operating temperature of the fuel cell and a reaction temperature of the steam reformer are each 400° C. or higher and 600° C. or lower.

11. The fuel cell system according to claim 9 , wherein the steam reformer has a cylindrical shape.

12. The fuel cell system according to claim 11 , wherein the steam reformer includes two concentric treatment chambers.

13. The fuel cell system according to claim 12 , wherein the two concentric treatment chambers are separated by a porous body.

14. The fuel cell system according to claim 13 , wherein the porous body has a honeycomb shape.

Assignees

• Sumitomo Electric Industries

Inventors

• Hiraiwa Chihiro
• Majima Masatoshi
• Higashino Takahiro
• Mizuhara Naho
• Tawarayama Hiromasa

Classifications

• B01J23/892 Primary

  Nickel and noble metals · CPC title

• B01J23/20

  Vanadium, niobium or tantalum · CPC title

• B01J23/755

  Nickel · CPC title

• B01J23/89

  combined with noble metals · CPC title

• C01B3/40

  characterised by the catalyst · CPC title