# US 6,720,100 B2 · Catalyst for oxidation of gaseous compound

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- Number: US 6,720,100 B2
- Document ID: US6720100B2
- Status: Granted
- Kind: B2
- Application number: 10/149,399
- Filed: 2002-06-11
- Published: 2002-12-05
- Granted: 2004-04-13
- Earliest claimed: 2000-10-27
- Assignees: Shinko Electric Industries Co., Ltd.
- Inventors: Kazunori Sato; Takashi Wakabayashi; Manabu Takezawa; Yasunobu Inoue; Shigeaki Suganuma
- Web page: https://patentgrep.com/patent/US6720100B2

## CPC

- B01J 23/62: with gallium, indium, thallium, germanium, tin or lead
- B01J 23/002: {Mixed oxides other than spinels, e.g. perovskite}
- B01J 23/89: combined with noble metals
- B01J 23/8913: {Cobalt and noble metals}
- B01J 37/03: Precipitation; Co-precipitation
- C01B 3/386: Catalytic partial combustion
- C01B 3/40: characterised by the catalyst
- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- H01M 4/9025: {Oxides specially used in fuel cell operating at high temperature, e.g. SOFC}
- B01J 2523/00: Constitutive chemical elements of heterogeneous catalysts
- C01B 2203/0261: containing a catalytic partial oxidation step [CPO]
- C01B 2203/1052: Nickel or cobalt catalysts
- C01B 2203/1064: Platinum group metal catalysts
- C01B 2203/107: Platinum catalysts
- C01B 2203/1241: Natural gas or methane
- H01M 8/1226: characterised by the supporting layer
- H01M 2004/8684: {Negative electrodes}
- H01M 2008/1293: {Fuel cells with solid oxide electrolytes}
- Y02E 60/50: Fuel cells
- Y02P 20/52: using catalysts, e.g. selective catalysts
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A solid electrolyte fuel cell having an anode including an oxidation catalyst of a gaseous compound fine in size and superior in oxidation action able to eliminate pulverization work is provided. The oxidation catalyst is of a gaseous compound comprising a catalyst for promoting an oxidation reaction of a gaseous compound by oxygen ions supplied through a solid electrolyte under an environment where no oxygen molecules are present, comprising metal oxide particles produced by firing a precipitate comprised of a mixture of two types of metal hydrates obtained by coprecipitation from a mixed solution of two types of metal salts of different metal positive ions dissolved together, the composition of said metal oxide particles being expressed by the formula ABO2 (where, A is one element selected from the group consisting of Pd, Pt, Cu, and Ag, B is one element selected from the group consisting of Co, Cr, Rh, Al, Ga, Fe, In, Sc, and Tl).

## Claims

### Claim 1

A solid electrolyte fuel cell having an anode including an oxidation catalyst of a gaseous compound comprising a catalyst for promoting an oxidation reaction of a gaseous compound by oxygen ions supplied through a solid electrolyte under an environment where no oxygen molecules are present, wherein the oxidation catalyst comprises a composition of metal oxide particles produced by firing a precipitate comprised of a mixture of two metal hydrates obtained by coprecipitation from a mixed solution of two metal salts of different metal positive ions dissolved together, the composition of said metal oxide particles is expressed by the formula:
ABO2
wherein, A is an element selected from the group consisting of Pd, Pt, Cu and Ag;
B is an element selected from the group consisting of Co, Cr, Rh, Al, Ga, Fe, In, Sc, and Tl
wherein the fuel cell is comprised of a large number of dispersed layers formed by dispersing said metal oxide particles inside a conductive porous body.

### Claim 2 (depends on 1)

A solid electrolyte fuel cell as set forth in claim 1, comprised of a layer formed by carrying said metal oxide particles on the outer surface of a conductive porous body.

### Claim 3 (depends on 1)

A solid electrolyte fuel cell as set forth in claims 1, wherein said gaseous compound is methane.

### Claim 4 (depends on 3)

A solid electrly fuel cell as set forth in claim 3, wherein said metal oxide particles are PdCoO2 or PtcoO2.

### Claim 5 (depends on 1)

A solid electrolyte fuel cell as set forth in claim 1, wherein said metal oxide particles are PdCoO2 or PtCoO2.