Abstract
The effect of alkaline modification on the structure of highly dealuminated zeolite Y, prepared by steaming (at 973 K) the ammoniation product of NH4-Y zeolite (53% NH4 +, Si/Al=2.37) pretreated at 873 K in a humid atmosphere, was studied by means of IR spectra of the zeolite lattice vibrations. Treatment of the sample with 0.25 N KOH at 293 K causes the dissolution of the non-framework aluminum hydroxide species with formation of basic aluminate, and the cleavage of linear siloxane bridges at the dealuminated sites. At 353 K the cleavage involves the non-linear disiloxane bonds, while the interaction of potassium aluminate with the terminal ≡Si-O(H,K) bonds thus formed brings about the regeneration of normal Al-O-Si bridges; however, parallel amorphization of the zeolite structure takes place due to pronounced depolymerization of the high-siliceous framework.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 797–799, April, 1993.
The author is grateful to V.Lutz (ZIPhCh, Germany) who kindly submitted samples1,2, and4, and to N. N. Feoktistova (IChS of the RAS), for the samples of silicaalumogel.
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Kosheleva, L.S. IR study of the peculiarities of alkaline realumination of the highly dealuminated product of hydrothermal treatment of zeolite Y. Russ Chem Bull 42, 766–768 (1993). https://doi.org/10.1007/BF00704024
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DOI: https://doi.org/10.1007/BF00704024