COMMUNICATIONSreaction inixture allixccd to stir at thih temperature. After 15 minutes, diethyl ether (10 m L) was condenscd onto the inixture. and I precipitated as acolorlesssolid. The liquid w a s decanted into the second iirin of the Schlenk vessel, the volatiles were pumped off undcr dynamic wxuum ;it --3O"C. and the solid was then allowed to bcarm slo~.ly to rooin tcmperature. 2. 3: After addition of the ether at -35 C a second phase was formed which was dccantrd into the second iirni of the reaction vessel. The workup of the residue was carried out as described for I .

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Eine deutliche Erweiterung des Anwendungsbereiches der Zweiphasenkatalyse bringen ionische Flüssigkeiten von Typ 1. Denn nun können auch in Wasser nur wenig lösliche oder instabile Substrate, Komplexe und Liganden für diese industriell hochinteressante Variante der Homogenkatalyse eingesetzt werden .

The dynamic behaviour of the NO SCR-reaction on Fe-exchanged zeolites was investigated by the transient response method (TRM). The results were used to develop a mathematical model for catalysts containing Fe-exchanged zeolites capable of describing the dynamic phenomena observed.

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