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- W2020147418 abstract "A series of AlHY zeolites has been prepared in which the original sodium ion was replaced by aluminum and hydrogen ions in varying concentrations. These zeolites show greater initial activity for the disproportionation of toluene than an acidic zeolite prepared from NH4Y zeolite; however, the activity decreases to the level of NH4Y upon the addition of more toluene. It is possible to introduce up to 16 exchangeable aluminum ions per unit cell, which is more than the number found in an ultrastable zeolite. In contrast to the ultrastable zeolite no aluminum is removed from the lattice during the formation of the AlHY zeolites. The AlHY zeolites are unstable to hydrothermal treatment. Infrared studies show that the number of hydroxyl groups with stretching frequencies at 3640 and 3540 cm−1 decreased as the aluminum exchange increased. No band at 3600 cm−1 was observed. The presence of exposed aluminum ions was confirmed by the EPR spectrum of adsorbed NO and O2−." @default.
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- W2020147418 date "1972-02-01" @default.
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- W2020147418 title "The physical properties and catalytic activity of AlHY zeolites" @default.
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- W2020147418 doi "https://doi.org/10.1016/0021-9517(72)90070-x" @default.
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