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    STUDIA CHEMIA - Issue no. 2 / 2004  
         
  Article:   INTERACTIONS OF METHANOL WITH ALPO4-5 AND SAPO-5 SINGLE CRYSTALS.

Authors:  J. BÓDIS, J. KORNATOWSKI, J.A. LERCHER. 		 
       
         
  Abstract:  The interactions of methanol as polar probe molecule with the framework of AlPO4-5 and SAPO-5 molecular sieves in the form of single large crystals were investigated with FT-IR micro-spectroscopy. Methanol exhibited weak interactions with AlPO4-5. The polar molecules of methanol on SAPO-5 interacted primarily with the bridging OH groups. Polar molecules of methanol revealed a bimodal distribution of acid strength of the bridging OH groups. Two adsorbate species have been found to occur, both bound via hydrogen bonds of different strength dependent on the adsorption site. The interactions between the probe molecules and the framework are stronger in the confined environment of the narrow channels than in the wide channels. However, all these interactions are weak and do not lead to irreversible structure changes of AlPO4-5 and SAPO-5 materials.  
         
     
         
         
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