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http://dx.doi.org/10.12925/jkocs.2007.24.3.8

Catalytic Activity Change of Perovskite Catalysts with A-Site Substitution  

Hahm, Hyun-Sik (Department of Chemical Engineering, Myongji University)
Kim, Kyu-Sung (Department of Chemical Engineering, Myongji University)
Ahn, Sung-Hwan (Department of Chemical Engineering, Myongji University)
Shin, Ki-Seok (Department of Chemical Engineering, Myongji University)
Kim, Song-Hyoung (Department of Chemical Engineering, Myongji University)
Park, Hong-Soo (Department of Chemical Engineering, Myongji University)
Publication Information
Journal of the Korean Applied Science and Technology / v.24, no.3, 2007 , pp. 272-277 More about this Journal
Abstract
Catalytic activity changes of perovskite catalysts were examined with their A-site substitution. For the preparation of catalysts, Mn was used for B-site component and La, Ce, Sr, Ba, Ca, Ag were used for A-site component of the perovskite $catalysts(ABO_3)$ The effect of calcination temperature on methane combustion and perovskite structure was also investigated. The surface area and adsorbed oxygen species were tested with BET apparatus and $O_2-TPD$, respectively. Perovskite catalysts whose A-site was partially substituted needed higher calcination temperature than un-substituted one to form the perovskite structure. From $O_2-TPD$ experiment, it was found that methane combustion activity was directly related to the oxygen desorbing ability of the catalysts. The prepared catalyst(LM-7) was stable at $600^{\circ}C$ for 72 hours of reaction.
Keywords
methane combustion; perovskite catalyst; calcination temperature; oxygen species;
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