Browsing by Author "Uytterhoeven, J. B."

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    Assignment of the Hydroxyl Bands in the Infrared Spectra of Zeolites X and Y: Part 2.—After Different Pretreatments
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1973, 69 (2), 1973) Jacobs, P. A.; Uytterhoeven, J. B.
    The i.r. absorption curve of “ deep bed ” calcined NH4Y zeolites could be broken down into the same components as HY zeolites. The frequency of the peaks was slightly changed, but their half band width remained constant. In a scries of treatments representing increasing hydrolysis non-acidic OH bands around 3680 and 3600 cm-1 increase in intensity, due to surface OH groups near Al defect locations. Polynuclear Al species bridging the cubo-octahcdra are suggested to be partly responsible for the increased thermal stability. The non-acidic OH bands in synthetic faujasites exchanged with polyvalent cations are explained on the same basis, since they behave in a similar way as the non-acidic bands on “ deep bed ” zeolites after different treatments.