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Zeolites Zeolites V 1350Na-A (LTA) Zeolite Synthesis Directly from Alumatrane and Silatrane by Sol-Gel Microwave Techniques. -The title zeolite (1 µm crystal size) is synthesized via a sol-gel process and microwave heating technique using alumatrane and silatrane in NaOH or NaCl as precursor solution (Teflon vessel, various Si:Al ratios). The samples are characterized by DSC/TGA, FTIR, XRD, N 2 porosometry, and SEM. The NaOH concentration strongly affects the particle size and particle size distribution, but not the product composition. The moisture absorption ability of the synthesized Na-A zeolites is higher than that of the commercial one by approximately 20%. -(SATHUPUNYA, M.; GULARI, E.; WONGKASEMJIT*, S.; J.