TY - GEN
T1 - Perovskite-type catalyst for catalytic combustion in MCFC system
AU - Jang, Jun Ho
AU - Lee, Dae Won
AU - Kim, Sungmin
AU - Lee, Joon Yeob
AU - Kim, Yun Sung
AU - Lee, Kwan Young
PY - 2007
Y1 - 2007
N2 - 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.
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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M3 - Conference contribution
AN - SCOPUS:56349112903
SN - 9780816910229
T3 - AIChE Annual Meeting, Conference Proceedings
BT - 2007 AIChE Annual Meeting
T2 - 2007 AIChE Annual Meeting
Y2 - 4 November 2007 through 9 November 2007
ER -