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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1409 (January) (2013)  >  pp.95-99

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1409 (January) (2013)   pp.95 - 99 Next article>>

Carbon oxidation activity of complex oxides (Part 2)—Characteristics of La0.9Ag0.1FeOα synthesized at low temperature using co-precipitation method—

Susumu NAKAYAMA1), Ryushiro TOKUNAGA1), Masaki SHIOMI2), Takahiro NAKA3)
1) Department of Applied Chemistry and Biotechnology, Niihama National College of Technology 2) Manufacturing Education Support Center, Niihama National College of Technology 3) Automobile R&D Center, Honda R&D Co., Ltd.

The perovskite oxide, LaFeO3, was synthesized by different preparation methods, i.e., the calcination of co-precipitated precursors [La(Ag)–Fe–CO3 and La–Fe–CO3] and a mixture of La2O3 and Fe2O3 (La–Fe–O). By using the solution of Ag, the formation temperature (600°C) of the LaFeO3 single phase obtained by the calcining of La(Ag)–Fe–CO3 was about 500°C lower than that of La–Fe–CO3. The formation temperature of the LaFeO3 single phase of La–Fe–O was 1100°C as well as that of La–Fe–CO3. Their carbon oxidations were investigated by DSC (differential scanning calorimetry) measurements. The DSC exothermic peak of La0.9Ag0.1FeOα obtained by the calcining of La(Ag)–Fe–CO3 at 700°C occurred at 409°C and showed a higher carbon oxidation activity when compared to LaFeO3 (477 and 562°C) obtained by the calcining of La–Fe–CO3 and La–Fe–O at 1100°C. The carbon oxidation activation energies observed for the non-catalyzed and catalyzed reactions (mixture of La0.9Ag0.1FeOα) were 160 and 130 kJ·mol−1, respectively.


Keyword:
Perovskite oxide, LaFeO3, Precursor, Oxide-mixing, Activation energy

Received: July 16, 2012
Accepted: November 06, 2012 , Published online: January 01, 2013
Copyright © 2013 The Ceramic Society of Japan

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