Abstract
AbstractThree series of dealuminated Y zeolites have been prepared by chemical extraction of hydrothermally dealuminated Y zeolite (USY) with H2Na2EDTA, HCl and H4EDTA. The unit cell constant, mesopore distribution, acidity and extraframework aluminum (EFAL) of the zeolites were studied with XRD, chemical analyses, adsorption, IR and NH3‐TPD techniques. It was shown that H2Na2EDTA only removed EFAL species deposited in the pores of USY, by contrast, HCl and H4EDTA extract both extraframework and framework aluminum, and make the zeolite framework further dealuminated. Adsorption tests gave evidence that a secondary pore system exists in these dealuminated zeolites. H2Na2EDTA extraction increased both micropore and mesopore volumes, but after HCl and H4EDTA treatments, new mesopores formed and the micropore volume was decreased. The pyridine‐IR and NH3‐TPD measurements demonstrated that EFAL had no evident contribution to the zeolite acidity.
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