Studies on Emission Spectra of the Catalysts of Alkali Alkaline-Earth Rare-Earth Metal Oxides

Abstract

Abstract: The formation of O^- species in oxide catalysts was investigated by characterization of emission spectra of Eu³⁺ ion.The experimental results show that in M/MgO and M/CaO sys-tems(M=Li⁺, Na⁺ and K⁺) Li⁺ and Na⁺ can enter into the lattice of MgO, and Li⁺, Na⁺ and K⁺ ions can enter into the lattice of CaO.These conclusions are in good agreement with what was found by Lunsford in his ESR studies.Based on the results of emission spectra investigation > an evidence that Li⁺ ion can not enter into the lattice of La₂O₃ in Li/La₂O₃ mixed oxide and, as a result, no O^- species can be formed was gained.The obtained experimental data also provided some useful information about the coordination conditions for simultaneous entrance of both mono- and tri-valence ions into the lattice of alkaline-earth metal oxides.

Key words: Emission spectra, ESR, Doped europium, O^- Species

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YANG Xiang-guang, BI Ying-li, ZHEN Kai-ji, Li Sen-zi, WANG Ji-xiang, WU Yue. Studies on Emission Spectra of the Catalysts of Alkali Alkaline-Earth Rare-Earth Metal Oxides[J]. Chem. J. Chinese Universities, 1992, 13(5): 645.

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Studies on Emission Spectra of the Catalysts of Alkali Alkaline-Earth Rare-Earth Metal Oxides

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