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Characterization of Extra-framework Cations in Zeolites. A temperature-programmed desorption (TPD) study

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Abstract

We have investigated the interaction of a few 5-ring organic compounds (cyclopentane, cyclopentene, furan, 2-methylfuran, 2,5-dihydrofuran and tetrahydrofuran) with alkali-metal cation-exchanged faujasites (LSX, X and Y types) by means of temperature-programmed desorption (TPD). The desorption behavior at higher temperatures of all probe molecules on the sodium ion containing faujasites with different Si/Al ratios reflects the higher cation content of zeolites with greater aluminum content. Only the desorption profiles of tetrahydrofuran and 2,5-dihydrofuran show, depending on the kind of cation, additional desorption features at higher temperatures. Using a regularization method, desorption energy distribution functions for furan and tetrahydrofuran were calculated. The calculated desorption energy distributions clearly illustrate the very different adsorption behavior of furan and tetrahydrofuran which leads to large differences in the binding energies between the corresponding adsorption complexes.

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Authors and Affiliations

  1. Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, D-04103, Leipzig, Germany

    I. A. Beta, B. Hunger & H. Böhlig

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  1. I. A. Beta
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  2. B. Hunger
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  3. H. Böhlig
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Beta, I.A., Hunger, B. & Böhlig, H. Characterization of Extra-framework Cations in Zeolites. A temperature-programmed desorption (TPD) study. Journal of Thermal Analysis and Calorimetry 64, 1191–1199 (2001). https://doi.org/10.1023/A:1011553231042

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