Abstract
A series of dealuminated NaY zeolites was studied by ESCA. NaY zeolite was dealuminated using an aqueous solution of H 4EDTA. Changes in surface compositions and chemical states as a result of dealumination are reported. ESCA data indicated that aluminum and sodium are preferentially removed from the external surface of the zeolite during dealumination. This is presumably due to diffusional limitations of EDTA molecules into the internal cavities of the zeolite particles. It was found also that Al atoms in the zeolite crystal termination positions are either neutralized by protons or tri-coordinated.
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