The ability of quaternary ammonium polymers to influence and to direct crystallization of zeolites is described for a series of l,4-diazabicyclo[2.2.2]octane-based polyelectrolytes. Examples are shown in which polymers force crystallization of large-pore zeolites (mordenite) where small-pore species would otherwise have resulted (analcite). It is shown that polymeric cations can prevent stacking faults in a synthetic gmelinite, faults which have hitherto restricted access to the 12-ring channels of both natural and synthetic samples of this zeolite. It is proposed that these polyelectrolytes function as templates in the crystallization.

The fixed bed microcatalytic system reported earlier (Chen and Lucki, 1971) has been modified and automated. The automated system is used to do repeated cycles of crackinghegeneration. Thus, the cyclic nature of the catalytic cracking process can be simulated by this unit. The test procedure is programmed by an electric timer to actuate six control circuits over a 60-min cycle allowing unit operation substantially unattended. The circuit is particularly suited for studies of long term stability of cracking catalysts.

Der Einfluß polymerer quaternärer Ammonium‐Ionen von Brom‐ und Alky1‐substituierten 1,4‐Diazabicyclo‐ [2.2.2]octanen auf die Kristallisation von Zeolithen (Gmelinit, Gmelinit + Chabasit , Analcit, Mordenit) wird untersucht.