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Tthe investigation of strong active sites of dealuminated y-type zeolite by TPD of carbon monoxide

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Abstract

The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (TM»620-690°C) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell). The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (Edes»240 kJ mol-1, A»1011 s-1).

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Authors and Affiliations

  1. Faculty of Agriculture, Institute of Food Technology, University of Belgrade, 11080, Beograd-Zemun, Nemanjina 6, P.O. Box 127, Yugoslavia

    V. M. Rakić

  2. Faculty of Physical Chemistry, University of Belgrade, 11000, Beograd, Akademski trg 12, P.O. Box 137, Yugoslavia

    V. T. Dondur & R. V. Hercigonja

  3. Institute 'Vinca' Beograd, Yugoslavia

    V. Andrić

Authors
  1. V. M. Rakić
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  2. V. T. Dondur
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  3. R. V. Hercigonja
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  4. V. Andrić
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Rakić, V.M., Dondur, V.T., Hercigonja, R.V. et al. Tthe investigation of strong active sites of dealuminated y-type zeolite by TPD of carbon monoxide. Journal of Thermal Analysis and Calorimetry 72, 761–767 (2003). https://doi.org/10.1023/A:1025049727731

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