Mössbauer spectrometric study of nonstoichiometric perovskite,A (Co0.8Fe0.2) O3−° (A=Ba,Sr, Ca), for oxidative coupling of methane |
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| Authors: | Kiyoshi Nomura Takeshi Goda Yusuke Ujihira Takashi Hayakawa Katsuomi Takehira |
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| Affiliation: | (1) Faculty of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113 Tokyo, Japan;(2) National Chemical Laboratory for Industry, Higashi 1-1, 305 Tsukuba city, Ibaragi Pref., Japan |
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| Abstract: | Nonstoichiometric perovskites. A(Co0.8Fe0.2)O3−6, were prepared by a pyrolysis of mixed metal citrates, and the catalytic property and structure of these perovskites were investigated. The efficiency of an oxidative coupling of methane increases with the order of Ba. Sr, and Ca substituted in A site and decreases with the amounts of deficient oxygens. The mixed valence of B site ions in the disordering of deficient oxygen is considered to contribute mainly to the oxidative coupling of methane. |
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