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Oxidation of carbon monoxide on rare earth cobaltites — Role of spin state equilibrium

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Abstract

The catalytic oxidation of CO on a series of LnCoO3 compounds (where Ln=La, Pr, Nd, Sm, Eu, Gd, Dy or Ho) has been studied. The Arrhenius plots show gradient changes around 180–200 °C which is the temperature range wherein ordering of low spin and high spin states starts. The activation energy for CO oxidation in the low temperature region varies linearly with oxygen deficiency. IR-Spectra of the adsorbed species in both the high and low temperature regions show the presence of carbonate species.

Abstract

Каталитическое окисление CO было исследовано в серии LnCoO3(где Ln=La, Pr, Nd, Sm, Eu, Gd, Dy или Ho). Аррениусовские зависимости свидетельствуют о постепенном изменении при 180–200°C, что представляет собой температурный интервал, где наступает упорядочение низкоспинового и высокоспиновых состояний. Энергия активации окисления CO в низкотемпературной области изменяется линейно с дефицитом кислорода. ИК-Спектры адсорбированных частиц в обеих высоко- и низкотемпературных областях указывают на присутствие карбонатных частиц.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology, 600 036, Madras, India

    B. Viswanathan & Susan George

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  1. B. Viswanathan
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  2. Susan George
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Viswanathan, B., George, S. Oxidation of carbon monoxide on rare earth cobaltites — Role of spin state equilibrium. React Kinet Catal Lett 27, 321–324 (1985). https://doi.org/10.1007/BF02070466

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  • DOI: https://doi.org/10.1007/BF02070466

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