Abstract

Starting with the batch composition 1 Al 2O 3:85 SiO 2:19 Na 2O:575 H 2O, a study was made to determine the effect of various additives and other modifications of the starting composition on the growth of larger mordenite crystals in this system. It was found that synthesis of larger mordenite single crystals requires the use of two silica sources, the addition of an appropriate salt, and higher basicity. Thermogravimetric analysis showed two ranges of weight loss which might be concerned with diffusional restrictions because of the large dimensions of mordenite crystals. MAS n.m.r. indicated that the as-synthesized mordenite should be small port mordenite, and there is no octahedral aluminum in the framework of the products. Results of the dispro-portionation of β-methylnaphthalene over different sizes of mordenite crystals show that the shape selectivity observed in these reactions might be related to diffusional restrictions inside the channels of mordenite.

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