Perovskite-type catalyst for catalytic combustion in MCFC system

Jun Ho Jang, Dae Won Lee, Sungmin Kim, Joon Yeob Lee, Yun Sung Kim, Kwan Young Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lots of developed MCFC power generation systems are combined with LNG reforming system for suppling hydrogen. In MCFC-LNG reformer combined system, some unreacted hydrogen was effluented as residue gases with appreciable amount of heat. To enhance the energy efficiency of MCFC power generation system, we will use hot residue gases which include unreacted hydrogen to heat up MCFC stack by using catalytic combustion. ABO3- type perovskite oxides have high potential for oxidation. And substitution of the metal in position A and/or B can change catalytic property of oxides. La1-x A' xFeO3 (A: Sr, Ag, Ce, X : 0.1, 0.3) perovskites were synthesized by citiric acid sol gel method using metal nitrates. The catalysts were chacterized by powder XRD and BET. The catalytic activity in hydrogen combustion were tested in a conventional flow reactor. Surface area of perovskite oxides decreased with increasing metal content up. La 0.9Ce0.1Fe03 catalyst showed the highest surface area 23.0m2/g at 700°C calcined. The patterns observed for all sample correspond mainly perovskite-type structure by using JCPDS program. This means that Sr, Ce was well substituted and posed in perovskite structure. But Ag substituted perovskite was looked Ag2O peak at 38.0 degree and the peak site was larger when X=0.3. Catalytic activity of all A-site substitutued catalyst are always higher than LaFeO3. Especially La0.9Sr0.9Fe03 shows the highest hydrogen combustion activity. The temperatures required for 50% and 90% conversion of hydrogen in its combustion are 139°Cand 185°C, respectively for the La0.9Sr0.1Fe03, and 227 °C and 345 °C, respectively for the LaFeO3.

Original languageEnglish
Title of host publicationAIChE Annual Meeting, Conference Proceedings
Publication statusPublished - 2007 Dec 1
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: 2007 Nov 42007 Nov 9

Other

Other2007 AIChE Annual Meeting
CountryUnited States
CitySalt Lake City, UT
Period07/11/407/11/9

Fingerprint

Molten carbonate fuel cells (MCFC)
Perovskite
Hydrogen
Catalysts
Oxides
Metals
Liquefied natural gas
Power generation
Catalyst activity
Gases
Reforming reactions
Nitrates
Powders
Sol-gel process
Energy efficiency
perovskite
Substitution reactions
Thermodynamic properties
Oxidation
Acids

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Jang, J. H., Lee, D. W., Kim, S., Lee, J. Y., Kim, Y. S., & Lee, K. Y. (2007). Perovskite-type catalyst for catalytic combustion in MCFC system. In AIChE Annual Meeting, Conference Proceedings

Perovskite-type catalyst for catalytic combustion in MCFC system. / Jang, Jun Ho; Lee, Dae Won; Kim, Sungmin; Lee, Joon Yeob; Kim, Yun Sung; Lee, Kwan Young.

AIChE Annual Meeting, Conference Proceedings. 2007.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Jang, JH, Lee, DW, Kim, S, Lee, JY, Kim, YS & Lee, KY 2007, Perovskite-type catalyst for catalytic combustion in MCFC system. in AIChE Annual Meeting, Conference Proceedings. 2007 AIChE Annual Meeting, Salt Lake City, UT, United States, 07/11/4.
Jang JH, Lee DW, Kim S, Lee JY, Kim YS, Lee KY. Perovskite-type catalyst for catalytic combustion in MCFC system. In AIChE Annual Meeting, Conference Proceedings. 2007
Jang, Jun Ho ; Lee, Dae Won ; Kim, Sungmin ; Lee, Joon Yeob ; Kim, Yun Sung ; Lee, Kwan Young. / Perovskite-type catalyst for catalytic combustion in MCFC system. AIChE Annual Meeting, Conference Proceedings. 2007.
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AB - Lots of developed MCFC power generation systems are combined with LNG reforming system for suppling hydrogen. In MCFC-LNG reformer combined system, some unreacted hydrogen was effluented as residue gases with appreciable amount of heat. To enhance the energy efficiency of MCFC power generation system, we will use hot residue gases which include unreacted hydrogen to heat up MCFC stack by using catalytic combustion. ABO3- type perovskite oxides have high potential for oxidation. And substitution of the metal in position A and/or B can change catalytic property of oxides. La1-x A' xFeO3 (A: Sr, Ag, Ce, X : 0.1, 0.3) perovskites were synthesized by citiric acid sol gel method using metal nitrates. The catalysts were chacterized by powder XRD and BET. The catalytic activity in hydrogen combustion were tested in a conventional flow reactor. Surface area of perovskite oxides decreased with increasing metal content up. La 0.9Ce0.1Fe03 catalyst showed the highest surface area 23.0m2/g at 700°C calcined. The patterns observed for all sample correspond mainly perovskite-type structure by using JCPDS program. This means that Sr, Ce was well substituted and posed in perovskite structure. But Ag substituted perovskite was looked Ag2O peak at 38.0 degree and the peak site was larger when X=0.3. Catalytic activity of all A-site substitutued catalyst are always higher than LaFeO3. Especially La0.9Sr0.9Fe03 shows the highest hydrogen combustion activity. The temperatures required for 50% and 90% conversion of hydrogen in its combustion are 139°Cand 185°C, respectively for the La0.9Sr0.1Fe03, and 227 °C and 345 °C, respectively for the LaFeO3.

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