# US 7,410,717 B2 · Solid oxide fuel cell(SOFC) for coproducing syngas and electricity by the internal reforming of carbon dioxide by hydrocarbons and electrochemical membrane reactor system

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- Number: US 7,410,717 B2
- Document ID: US7410717B2
- Status: Granted
- Kind: B2
- Application number: 10/830,225
- Filed: 2004-04-23
- Published: 2005-04-28
- Granted: 2008-08-12
- Earliest claimed: 2003-10-25
- Assignees: Korea Institute of Science and Technology
- Inventors: Dong Ju Moon; Jong Woo Ryu; Jong Min Park; Byung Gwon Lee; Sang Deuk Lee
- Web page: https://patentgrep.com/patent/US7410717B2

## CPC

- H01M 4/9066: {of metal-ceramic composites or mixtures, e.g. cermets}
- H01M 4/8621: {containing only metallic or ceramic material, e.g. made by sintering or sputtering}
- H01M 4/8885: {Sintering or firing}
- H01M 4/90: Selection of catalytic material
- H01M 4/9033: {Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites}
- Y02E 60/50: Fuel cells
- 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

## Abstract

The present invention relates to a solid oxide fuel cell for internal reforming of hydrocarbons and carbon dioxide, in particular, to a solid oxide fuel cell in which one side of solid oxide electrolyte (YSZ) is attached to an air electrode (La0.8Sr0.2MnO3) and its other side is attached to a catalyst electrode of Ni-YSZ type or perovskite type metal oxide. The electrochemical conversion system using the solid oxide fuel cell permits the occurrence of internal reforming of hydrocarbons and carbon dioxide concomitantly with the coproduction of a syngas and electricity, and overcomes the shortcomings associated with the catalytic deactivation due to carbon deposition and the high-energy consumption.

## Claims

### Claim 1

A solid oxide fuel cell for coproducing syngas and electricity by internal reforming of methane and carbon dioxide, comprising
an ion conductive solid oxide electrolyte,
a catalyst electrode (anode) and an air electrode (cathode) contacting the electrolyte, wherein said catalyst electrode (anode) comprises Ni-YSZ type or perovskite type metal oxide, and
a gas mixture having the following gas volume ratio:
CH4:CO2:H2O:O2:H2:CO=1:0.4-0.6:0.4-0.7:0.01-0.2:0-1:0-1.

### Claim 2 (depends on 1)

The solid oxide fuel cell according to claim 1, wherein one side of said solid oxide electrolyte is contacts a LaSrMnO3 type air electrode (cathode) and the other side of said solid oxide electrolyte contacts a catalyst electrode (anode) of Ni-YSZ type or perovskite type metal oxide.

### Claim 3 (depends on 1, 2)

The solid oxide fuel cell according to claim 1 or 2, wherein said Ni-YSZ type metal oxide has a composition of 40-55 wt % of Ni, 40-55 wt % of YSZ and 0-10 wt % of CeO2 or MgO.

### Claim 4

An electrochemical conversion system, comprising
a gas feed,
a reactor comprising a solid oxide fuel cell having an air electrode (cathode) and a catalyst electrode (anode) of Ni-YSZ type or perovskite type metal oxide in flow communication with said gas feed,
a gas mixture having the following gas volume ratio:
CH4:CO2:H2O:O2:H2:CO=1:0.4-0.6:0.4-0.7:0.01-0.2:0-1:0-1,
where the gas mixture is introduced to said reactor through said gas feed.

### Claim 5 (depends on 4)

The electrochemical conversion system according to claim 4, wherein the feed of CO2 and CH4 to said system is at least partially from a process producing CO2 and CH4 as by-products.