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  • 1 Faculty of Agriculture Belrade-Zemun Yugoslavia 11080 Nemanjina 6 Belrade-Zemun Yugoslavia 11080 Nemanjina 6
  • | 2 Institut de Recherches sur la Catalyse Villeurbanne Cedex France 69626 2, Av. Einstein Villeurbanne Cedex France 69626 2, Av. Einstein
  • | 3 Institute of General and Physical Chemistry Belgrade Yugoslavia 11000 Studentski trg 12 Belgrade Yugoslavia 11000 Studentski trg 12
  • | 4 University of Belgrade Faculty of Physical Chemistry Belgrade Yugoslavia Belgrade Yugoslavia
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Abstract  

In this work, room temperature interaction of n-hexane with HZSM-5 (Si/Al=20) and ion-exchanged samples containing one (CuZSM-5, FeZSM-5 and MnZSM-5) or two transition-metal cations (Fe,CuZSM-5; Cu,MnZSM-5 and Fe,MnZSM-5) was studied by microcalorimetry and TPD methods. Both differential heats and the amounts of n-hexane adsorbed per one unit cell were quantitatively determined. Higher heats of adsorption and higher amounts of adsorbed gas were found for ion-exchanged samples than for HZSM-5. The experiments of n-hexane adsorption on hydrated samples were also performed. The amounts of n-hexane adsorbed on hydrated ZSM-5 were lower in comparison with dehydrated samples, while the energies of interaction were similar.