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Abstract:
The principle of preparation of modified zeolites by solid-state reaction is illustracted using simple systems such as mixtures of alkaline, alkaline earth or lanthanum chlorides and ammonium or hydrogen forms of zeolites. The avantages of this approach are discusse solid-state reaction is an attractive route to preparation of acidic or bifunctional catalysts. Finally, it is shown that solid-state modification is also possible using the as-synthesized sodium forms, for instance for an ion exchange with mono-, bi-and trivalent cations, which is investigates by IR, 23Na MAS NMR, TPE and, in the case of FeCI2, additionally with Mössbauer spectroscopy.
