Crystallization kinetics of amorphous |
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| Authors: | Chrissafis K. Efthimiadis K. G. Polychroniadis E. K. Chadjivasiliou S. C. |
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| Affiliation: | (1) Faculty of Agriculture, Institute of Food Technology, University of Belgrade, 11080 Beograd-Zemun, Nemanjina 6, P.O. Box 127, Yugoslavia;(2) Faculty of Physical Chemistry, University of Belgrade, 11000 Beograd, Akademski trg 12, P.O. Box 137, Yugoslavia;(3) Institute 'Vinca' Beograd, Yugoslavia |
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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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| Keywords: | CO dealuminated Y zeolite TPD |
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