Zeolite omega composition

Characterization of Zeolite Omega. Chemical Composition. Analytical data for several samples of zeolite to are collected in Table II. The... 

A series of preliminary test syntheses of ZSM-20 from reference gel compositions using variable TEA+/Si02 values (TEA+ introduced as bromide as to keep the alkalinity constant) revealed that ZSM-20 is formed in optimal conditions for ratios close to 0.9, value which was recommended by Valyocsik (341. For values lower than 0.5, dense phases such as Analcime, zeolite P or compact Na silicates are formed. For higher TEA+ concentrations ( TEA+/Si02 higher than 1.5), thermodynamically more stable Hydroxysodalite or zeolite Omega (ZSM-4) cocrystallize. 

The desire to synthesize molecular sieve compositions containing other than the typical silicon and aluminum atoms is evidenced by the large number of efforts, primarily in the primary synthesis area. The Secondary Synthesis process has now been extended to include substitution of both Fe3t and T1 + into the frameworks of a number of zeolites. This paper will describe substitution of iron or titanium ions into the frameworks of zeolites Y, L, W, mordenite, ZSM-5 and LZ-202. Zeolites Y, L, W and mordenite were obtained from Union Carbide Corporation. Zeolon, a synthetic mordenite, was obtained from The Norton Company. ZSM-5 was synthesized according to the procedures described by Argauer et al., (8). LZ-202 is an omega type zeolite, synthesized without the... 

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