| DEFECTS IN PEROVSKITE-TYPE CATALYSTS Ca_xLa_(1-x)MnO_(3 λ) AND THEIR ROLE IN AMMONIA OXIDATION |
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| 引用本文： | 王承宪,窦伯升,范淑蓉,于作龙,谢筱帆,吴越.DEFECTS IN PEROVSKITE-TYPE CATALYSTS Ca_xLa_(1-x)MnO_(3 λ) AND THEIR ROLE IN AMMONIA OXIDATION[J].中国科学B辑(英文版),1984(8). |
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| 作者姓名： | 王承宪 窦伯升 范淑蓉 于作龙 谢筱帆 吴越 |
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| 作者单位： | Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica，Changchun Institute of Applied Chemistry，Academia Sinica |
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| 摘 要： | The crystal structure of perovskite-type catalysts, Ca_xLa_(1-x)MnO_(3 λ), remains unchangedwhen x varies from 0 to 1 as identified by X-ray analysis. Both non-stoichiometric amountof oxygen (denoted by λ) and Mn~(4 ) content are functions of x. ESR analysis showed thatvarying the substitution value x in A, the oxidation state of B could simultaneously be adjust-ed, this permits one to change the oxygen chemisorpting ability of these catalysts and toraise their catalytic activity. Based upon the experimental results and from the point ofview of solid defect chemistry, a theoretical analysis for the possible formation of defecttypes is made, and the assumption that the formation of the active species O_2~- or O~- isthrough the reaction of oxygen anion defect with molecular oxygen in gas phase is proposed.This idea is supported by the data obtained by XPS investigation. The reaction mechanism ofpcrovskite-type catalyst for ammonia oxidation is discussed accordingly.
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