# US 2008/0187801 A1 · Fuel oxidizing catalyst, method for preparing the same, reformer including the same, and fuel cell system including the same

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- Number: US 2008/0187801 A1
- Document ID: US20080187801A1
- Status: Published application
- Kind: A1
- Application number: 11/938,158
- Filed: 2007-11-09
- Published: 2008-08-07
- Earliest claimed: 2006-11-15
- Inventors: Leonid Gorobinskiy; Ju-Yong Kim; Kie Hyun Nam; Jin-Goo Ahn; Man-Seok Han; Yong-Kul Lee; Sung-Chul Lee; Chan-Ho Lee; Jin-Kwang Kim; Dong-Uk Lee; Noboru Sato
- Web page: https://patentgrep.com/patent/US20080187801A1

## CPC

- B01J 23/83: with rare earths or actinides
- B01J 23/894: {with rare earths or actinides}
- C01B 3/384: with external heating of the catalyst
- C01B 3/40: characterised by the catalyst
- H01M 8/0612: from carbon-containing material
- B01J 21/04: Alumina
- B01J 37/0205: {in several steps}
- C01B 2203/0233: the reforming step being a steam reforming step
- C01B 2203/0238: the reforming step being a carbon dioxide reforming step
- C01B 2203/0283: containing a CO-shift step, i.e. a water gas shift step
- C01B 2203/044: Selective oxidation of carbon monoxide
- C01B 2203/047: the impurity being carbon monoxide
- C01B 2203/066: with fuel cells
- C01B 2203/0811: by combustion of fuel
- C01B 2203/1047: Group VIII metal catalysts
- C01B 2203/1052: Nickel or cobalt catalysts
- C01B 2203/1058: Nickel catalysts
- C01B 2203/107: Platinum catalysts
- C01B 2203/1076: Copper or zinc-based catalysts
- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- Y02E 60/50: Fuel cells
- Y02P 20/141: Feedstock
- Y02P 20/52: using catalysts, e.g. selective catalysts
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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 fuel oxidizing catalyst, a method of preparing the same, and a reformer and a fuel cell system including the same. In one embodiment, the fuel oxidizing catalyst for a fuel cell includes CeO2, MO (wherein M is a transition metal), and CuO. In this embodiment, the fuel oxidizing catalyst has a relatively high (or excellent) catalytic activity for a fuel oxidizing catalyst reaction and performs a fuel oxidizing catalyst reaction at a relatively low temperature even though it does not include a noble metal.

## Claims

### Claim 1

A fuel oxidizing catalyst for a fuel cell comprising:
a metal oxide comprising CeO2, MO, and CuO,
wherein M is a transition metal.

### Claim 2 (depends on 1)

The fuel oxidizing catalyst of claim 1, wherein M comprises a material selected from the group consisting of Ni, Co, Fe, and combinations thereof.

### Claim 3 (depends on 2)

The fuel oxidizing catalyst of claim 2, wherein M is Fe.

### Claim 4 (depends on 1)

The fuel oxidizing catalyst of claim 1, wherein the fuel oxidizing catalyst comprises the CeO2 in an amount ranging from about 10 to about 30 parts by weight, the MO in an amount ranging from about 0.1 to about 5 parts by weight, and the CuO in an amount ranging from about 1 to about 10 parts by weight.

### Claim 5 (depends on 1)

The fuel oxidizing catalyst of claim 1, wherein the metal oxide further comprises ZrO2.

### Claim 6 (depends on 5)

The fuel oxidizing catalyst of claim 5, wherein the fuel oxidizing catalyst comprises the ZrO2 in an amount ranging from about 5 to about 20 parts by weight, the CeO2 in an amount ranging from about 5 to about 20 parts by weight, the MO in an amount ranging from about 0.1 to about 5 parts by weight, and the CuO in an amount ranging from about 1 to about 10 parts by weight.

### Claim 7 (depends on 1)

The fuel oxidizing catalyst of claim 1, wherein the metal oxide is supported on a carrier comprises a material selected from the group consisting of Al2O3, TiO2, SiO2, cordierite, and combinations thereof.

### Claim 8 (depends on 1)

The fuel oxidizing catalyst of claim 1, further comprising a platinum-based metal.

### Claim 9 (depends on 8)

The fuel oxidizing catalyst of claim 8, wherein M comprises a material selected from the group consisting of Ni, Co, Fe, and combinations thereof.

### Claim 10 (depends on 9)

The fuel oxidizing catalyst of claim 9, wherein M is Ni.

### Claim 11 (depends on 8)

The fuel oxidizing catalyst of claim 8, wherein the platinum-based metal comprises a material selected from the group consisting of Pt, Pd, Ru, Rh, and combinations thereof.

### Claim 12 (depends on 8)

The fuel oxidizing catalyst of claim 8, wherein the fuel oxidizing catalyst comprises the platinum-based metal in an amount ranging from about 0.1 to about 50 parts by weight, the CeO2 in an amount ranging from about 10 to about 30 parts by weight, the MO in an amount ranging from about 0.1 to about 2 parts by weight, and the CuO in an amount ranging from about 1 to about 10 parts by weight.

### Claim 13 (depends on 8)

The fuel oxidizing catalyst of claim 8, wherein the metal oxide further comprises ZrO2.

### Claim 14 (depends on 13)

The fuel oxidizing catalyst of claim 13, wherein the fuel oxidizing catalyst comprises the platinum-based metal in an amount ranging from about 0.1 to about 50 parts by weight, the ZrO2 in an amount ranging from about 5 to about 20 parts by weight, the CeO2 in an amount ranging from about 5 to about 20 parts by weight, the MO in an amount ranging from about 0.1 to about 2 parts by weight, and the CuO in an amount ranging from about 1 to about 10 parts by weight.

### Claim 15 (depends on 8)

The fuel oxidizing catalyst of claim 8, wherein the metal oxide is supported on a carrier comprising a material selected from the group consisting of Al2O3, TiO2, SiO2, cordierite, and combinations thereof.

### Claim 16

A method of preparing a fuel oxidizing catalyst for a fuel cell, the method comprising:
dissolving a Ce precursor and an M precursor in a Cu-containing solution; and
heating the precursor dissolved solution,
wherein M is a transition metal.

### Claim 17 (depends on 16)

The method of claim 16, wherein the Ce precursor comprises a material selected from the group consisting of cesium nitrate, ammonium cesium nitrate, cesium acetate, cesium chloride, hydrates thereof, and combinations thereof.

### Claim 18 (depends on 16)

The method of claim 16, wherein the M precursor comprises a material selected from the group consisting of M nitrate, M acetate, M chloride, hydrates thereof, and combinations thereof.

### Claim 19 (depends on 16)

The method of claim 16, further comprising:
dissolving a Cu precursor in a solvent to prepare the Cu-containing solution.

### Claim 20 (depends on 19)

The method of claim 19, wherein the Cu precursor comprises a material selected from the group consisting of copper nitrate, copper acetate, hydrates thereof, and mixtures thereof.

### Claim 21 (depends on 19)

The method of claim 19, wherein the solvent for dissolving the Cu precursor comprises a material selected from the group consisting of water, methanol, ethanol, and combinations thereof.

### Claim 22 (depends on 16)

The method of claim 16, further comprising:
adding a Zr precursor to the Cu-containing solution.

### Claim 23 (depends on 22)

The method of claim 22, wherein the Zr precursor comprises a material selected from the group consisting of zirconium nitrate, ammonium zirconium nitrate, zirconium acetate, zirconium chloride, hydrates thereof, and combinations thereof.

### Claim 24 (depends on 16)

The method of claim 16, further comprising:
adding a carrier to the Cu-containing solution.

### Claim 25 (depends on 24)

The method of claim 24, wherein the carrier comprises a material selected from the group consisting of Al2O3, TiO2, SiO2, cordierite, and combinations thereof.

### Claim 26 (depends on 16)

The method of claim 16, wherein the heating the precursor dissolvent comprises:
heating the precursor dissolvent at a temperature ranging from about 100 to about 200° C.

### Claim 27 (depends on 16)

The method of claim 16, wherein the heating the precursor dissolvent comprises:
heating the precursor dissolvent for a period ranging from about 1 to about 3 hours.

### Claim 28 (depends on 16)

The method of claim 16, further comprising:
calcinating the metal oxide.

### Claim 29 (depends on 28)

The method of claim 28, wherein the calcinating the metal oxide comprises:
calcinating the metal oxide at a temperature ranging from about 450 to about 550° C.

### Claim 30 (depends on 28)

The method of claim 28, wherein the calcinating the metal oxide comprises:
calcinating the metal oxide for a period ranging from about 1 to about 3 hours.

### Claim 31 (depends on 16)

The method of claim 16, further comprising:
adding a metal oxide to a solution including a platinum-based metal precursor; and
heating the metal oxide added solution.

### Claim 32 (depends on 31)

The method of claim 31, wherein the platinum-based metal precursor comprises a material selected from the group consisting of H2PtCl6, Pt(C5H7O2)2, H6Cl2N2Pt, PtCl2, PtBr2, PdCl2, Pd(C2H3O2)2, Pd(C5H7O2)2, RuCl3, Ru(C5H7O2)3, (NH4)2RuCl6, (NH4)3RhCl6, [Rh(CH3COO)2]2, Rh(H2O)(NO3)3, hydrates thereof, and combinations thereof.

### Claim 33 (depends on 31)

The method of claim 31, wherein the solution including the platinum-based metal precursor is prepared by dissolving the platinum-based metal precursor in a solvent comprising a material selected from the group consisting of water, N,N-dimethylformamide, methanol, and combinations thereof.

### Claim 34 (depends on 31)

The method of claim 31, wherein the heating the metal oxide added solution comprises:
heating the metal oxide added solution at a temperature ranging from about 100 to about 200° C.

### Claim 35 (depends on 31)

The method of claim 31, wherein the heating the metal oxide added solution comprises:
heating the metal oxide added solution for a period ranging from about 15 minutes to about 45 minutes.

### Claim 36 (depends on 31)

The method of claim 31, further comprising:
calcinating the oxidizing catalyst.

### Claim 37 (depends on 36)

The method of claim 36, wherein the calcinating the oxidizing catalyst comprises:
calcinating the oxidizing catalyst at a temperature ranging from about 650 to about 750° C.

### Claim 38 (depends on 36)

The method of claim 36, wherein the calcinating the oxidizing catalyst comprises:
calcinating the oxidizing catalyst for a period ranging from about 0.5 to about 2 hours.

### Claim 39

A reformer for a fuel cell comprising:
a heating source for generating heat through an oxidizing catalyst reaction of a fuel and an oxidant; and
a reforming reaction part for generating a hydrogen-rich gas through a reforming catalyst reaction,
wherein the fuel oxidizing catalyst comprises:
a metal oxide comprising CeO2, MO, and CuO, and
wherein M is a transition metal.

### Claim 40 (depends on 39)

The reformer of claim 39, wherein M comprises a material selected from the group consisting of Ni, Co, Fe, and combinations thereof.

### Claim 41 (depends on 39)

The reformer of claim 39, wherein the metal oxide further comprises ZrO2.

### Claim 42 (depends on 39)

The reformer of claim 39, wherein the fuel oxidizing catalyst further comprises a platinum-based metal.

### Claim 43 (depends on 42)

The reformer of claim 42, wherein the platinum-based metal comprises a material selected from the group consisting of Pt, Pd, Ru, Rh, and combinations thereof.

### Claim 44 (depends on 42)

The reformer of claim 42, wherein the fuel oxidizing catalyst further comprises ZrO2.

### Claim 45 (depends on 39)

The reformer of claim 39, wherein the metal oxide is supported on a carrier comprising a material selected from the group consisting of Al2O3, TiO2, SiO2, cordierite, and combinations thereof.

### Claim 46

A fuel cell system comprising:
a reformer comprising:
a heating source for generating heat through an oxidizing catalyst reaction of a fuel and an oxidant, and
a reforming reaction part for generating a hydrogen-rich gas through a reforming catalyst reaction,
wherein the fuel oxidizing catalyst comprises:
a metal oxide comprising CeO2, MO, and CuO, and
wherein M is a transition metal;
at least one electricity generating element for generating electrical energy through an electrochemical reaction of hydrogen gas and an oxidant;
a fuel supplier for supplying the fuel to the reformer and the electricity generating element; and
an oxidant supplier for supplying the oxidant to the reformer and the electricity generating element.

### Claim 47 (depends on 46)

The fuel cell system of claim 46, wherein M comprises a material selected from the group consisting of Ni, Co, Fe, and combinations thereof.

### Claim 48 (depends on 46)

The fuel cell system of claim 46, wherein the metal oxide further comprises ZrO2.

### Claim 49 (depends on 46)

The fuel cell system of claim 46, wherein the fuel oxidizing catalyst further comprises a platinum-based metal.

### Claim 50 (depends on 49)

The fuel cell system of claim 49, wherein the platinum-based metal comprises a material selected from the group consisting of Pt, Pd, Ru, Rh, and combinations thereof.

### Claim 51 (depends on 49)

The fuel cell system of claim 49, wherein the fuel oxidizing catalyst further comprises ZrO2.

### Claim 52 (depends on 46)

The fuel cell system of claim 46, wherein the metal oxide is supported on a carrier comprising a material selected from the group consisting of Al2O3, TiO2, SiO2, cordierite, and combinations thereof.