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Na-LTA membranes have been synthesized on porous nickel supports by in situ crystallization from a true solution. K-LTA and Ca-LTA membranes have been prepared from Na-LTA membranes by ion exchange in 1 M KCl and CaCl2 solutions, respectively. The formation of the LTA structure, its preservation during ion exchange, and achievement of nearly 100% replacement in the near-surface layer of the zeolite...