Catalytic combustion of SOFC stack flue gas over CuO and Mn2O3 supported by La0.8Sr0.2Mn0.67Cu0.33O3 perovskite

Jae Gi Sung; Taewook Kim; Han Kyu Jung; Hwan Kim; Jong Shik Chung

doi:10.1002/aic.15980

Catalytic combustion of SOFC stack flue gas over CuO and Mn₂O₃ supported by La_0.8Sr_0.2Mn_0.67Cu_0.33O₃ perovskite

Jae Gi Sung, Taewook Kim, Han Kyu Jung, Hwan Kim, Jong Shik Chung

Department of Energy Chemical Engineering

Pohang University of Science and Technology

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

An efficient oxidation catalyst was developed to increase the combustion efficiency of unreacted CO, H₂, and CH₄ in flue gas of solid oxide fuel cell (SOFC) stack. Amorphous Cu-Mn oxide catalyst (CuMnLa/Alumina) showed high catalytic activity, but significant degradation occurred due to phase transition to spinel structure at high temperatures (T > 650°C). La_0.8Sr_0.2Mn_0.67Cu_0.33O₃ perovskite (LSMC(p)) supported CuO or Mn₂O₃ exhibited improved thermal stability than CuMnLa/Alumina catalyst. Especially in case of 50Mn/LSMC(p), after the catalyst was exposed to 800°C for 24 h, T₅₀ of CO, H₂ and CH₄ was achieved at 170, 230, and 600°C, respectively. This result is much lower than that of CuMnLa/Alumina, which was exposed to the same condition. The high combustion efficiency is due to retention of the Cu²⁺-Mn³⁺ redox couple, and supply of lattice oxygen from LSMC(p), especially at high temperature.

Original language	English
Pages (from-to)	940-949
Number of pages	10
Journal	AIChE Journal
Volume	64
Issue number	3
DOIs	https://doi.org/10.1002/aic.15980
State	Published - Mar 2018

Keywords

copper-manganese oxide
hopcalite
methane SOFC
oxidation catalyst
SOFC stack flue gas

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@article{0a27419524004790ad38d4b3a3abf505,

title = "Catalytic combustion of SOFC stack flue gas over CuO and Mn2O3 supported by La0.8Sr0.2Mn0.67Cu0.33O3 perovskite",

abstract = "An efficient oxidation catalyst was developed to increase the combustion efficiency of unreacted CO, H2, and CH4 in flue gas of solid oxide fuel cell (SOFC) stack. Amorphous Cu-Mn oxide catalyst (CuMnLa/Alumina) showed high catalytic activity, but significant degradation occurred due to phase transition to spinel structure at high temperatures (T > 650°C). La0.8Sr0.2Mn0.67Cu0.33O3 perovskite (LSMC(p)) supported CuO or Mn2O3 exhibited improved thermal stability than CuMnLa/Alumina catalyst. Especially in case of 50Mn/LSMC(p), after the catalyst was exposed to 800°C for 24 h, T50 of CO, H2 and CH4 was achieved at 170, 230, and 600°C, respectively. This result is much lower than that of CuMnLa/Alumina, which was exposed to the same condition. The high combustion efficiency is due to retention of the Cu2+-Mn3+ redox couple, and supply of lattice oxygen from LSMC(p), especially at high temperature.",

keywords = "copper-manganese oxide, hopcalite, methane SOFC, oxidation catalyst, SOFC stack flue gas",

author = "Sung, {Jae Gi} and Taewook Kim and Jung, {Han Kyu} and Hwan Kim and Chung, {Jong Shik}",

note = "Publisher Copyright: {\textcopyright} 2017 American Institute of Chemical Engineers",

year = "2018",

month = mar,

doi = "10.1002/aic.15980",

language = "English",

volume = "64",

pages = "940--949",

journal = "AIChE Journal",

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T1 - Catalytic combustion of SOFC stack flue gas over CuO and Mn2O3 supported by La0.8Sr0.2Mn0.67Cu0.33O3 perovskite

AU - Sung, Jae Gi

AU - Kim, Taewook

AU - Jung, Han Kyu

AU - Kim, Hwan

AU - Chung, Jong Shik

PY - 2018/3

Y1 - 2018/3

N2 - An efficient oxidation catalyst was developed to increase the combustion efficiency of unreacted CO, H2, and CH4 in flue gas of solid oxide fuel cell (SOFC) stack. Amorphous Cu-Mn oxide catalyst (CuMnLa/Alumina) showed high catalytic activity, but significant degradation occurred due to phase transition to spinel structure at high temperatures (T > 650°C). La0.8Sr0.2Mn0.67Cu0.33O3 perovskite (LSMC(p)) supported CuO or Mn2O3 exhibited improved thermal stability than CuMnLa/Alumina catalyst. Especially in case of 50Mn/LSMC(p), after the catalyst was exposed to 800°C for 24 h, T50 of CO, H2 and CH4 was achieved at 170, 230, and 600°C, respectively. This result is much lower than that of CuMnLa/Alumina, which was exposed to the same condition. The high combustion efficiency is due to retention of the Cu2+-Mn3+ redox couple, and supply of lattice oxygen from LSMC(p), especially at high temperature.

AB - An efficient oxidation catalyst was developed to increase the combustion efficiency of unreacted CO, H2, and CH4 in flue gas of solid oxide fuel cell (SOFC) stack. Amorphous Cu-Mn oxide catalyst (CuMnLa/Alumina) showed high catalytic activity, but significant degradation occurred due to phase transition to spinel structure at high temperatures (T > 650°C). La0.8Sr0.2Mn0.67Cu0.33O3 perovskite (LSMC(p)) supported CuO or Mn2O3 exhibited improved thermal stability than CuMnLa/Alumina catalyst. Especially in case of 50Mn/LSMC(p), after the catalyst was exposed to 800°C for 24 h, T50 of CO, H2 and CH4 was achieved at 170, 230, and 600°C, respectively. This result is much lower than that of CuMnLa/Alumina, which was exposed to the same condition. The high combustion efficiency is due to retention of the Cu2+-Mn3+ redox couple, and supply of lattice oxygen from LSMC(p), especially at high temperature.

KW - copper-manganese oxide

KW - hopcalite

KW - methane SOFC

KW - oxidation catalyst

KW - SOFC stack flue gas

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DO - 10.1002/aic.15980

M3 - Article

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SN - 0001-1541

VL - 64

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JO - AIChE Journal

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ER -

Catalytic combustion of SOFC stack flue gas over CuO and Mn₂O₃ supported by La_0.8Sr_0.2Mn_0.67Cu_0.33O₃ perovskite

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