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A microcalorimetric study of the adsorption of NH3 on H, Na-MOR catalysts

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Abstract

The adsorption of NH3 has been studied on N,Na-MOR samples at 573 K by microcalorimetry. The heat of adsorption as a function of coverage shows a stepwise change. The steps can be attributed to different cationic sites characterized by distinct energy of ammonia adsorption. An increase in the degree of ion exchange increases not only the number of acid sites but their strength, too. The calorimetric measurements made possible to determine the number of acid centers of different strengths.

Abstract

Микрокалориметрическим методом исследована адсорбция NH3 на N,Na-MOR при 573 K. Теплота адсорбции изменяется ступенчатым образом в зависимости от степени заполнения поверхности. Отдельные ступени приписываются к различным катионным центрам, характеризованным различными энергиями адсорбции аммиака. Увеличение степени ионного обмена увеличивает не только число, но и силу кислотных центров. Калориметрические измерения позволяют определить число кислотных центров различной силы.

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Authors and Affiliations

  1. N.D. Zelinskii Institute of Organic Chemistry, USSR Academy of Sciences, Moscow, USSR

    A. L. Klyachko, T. R. Brueva & G. I. Kapustin

  2. Central Research Institute for Chemistry of the Hungarian Academy of Sciences, P.O. Box 17, 1025, Budapest, Hungary

    I. Bankós

Authors
  1. A. L. Klyachko
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  2. I. Bankós
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  3. T. R. Brueva
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  4. G. I. Kapustin
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Klyachko, A.L., Bankós, I., Brueva, T.R. et al. A microcalorimetric study of the adsorption of NH3 on H, Na-MOR catalysts. React Kinet Catal Lett 29, 451–455 (1985). https://doi.org/10.1007/BF02068540

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  • DOI: https://doi.org/10.1007/BF02068540

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