Isomorphous Substitution of Metallic Elements for Zeolite Y in Aqueous Solution

Abstract

Abstract: The substitution of Ti, Fe and Zr into zeolite Yin aqueous solution of(NH₄)₂TiF₆, (NH₄)₃ZrF₇ and (NH₄)₃FeF₆ is investigated systematically. It is found that Al in the framework was replaced by the metallic elements and the extent of substitution depends on the M/Al ratio of the solution. The maximum allowable M/Al ratio of the aqueous solution is related with the radius of Matom and the stability constant of the MF_a^m- complex. The substituted, zeolite samples with crystallinity > 80% were characterized with XRD, IR, DTA and TPR. The incorporation of Ti, Fe and Zr into the zeolite leads to an increase in unit cell parameter, a lowering of thermal stability and a red shift of the asymmetric stretch frequency. The extent of these changes is correlated with the ionic radius of the metallic element and the degree of substitution. Results of various characterization methods show that the heteroatoms are substituted readily into the zeolite framework using this preparation method.

Key words: Isomorpous substitution, Zeolite Y, Thermal stability, Temperature-programmed desorption

TrendMD:

Tang Yi, Xu Jin-suo, Gao Zi . Isomorphous Substitution of Metallic Elements for Zeolite Y in Aqueous Solution[J]. Chem. J. Chinese Universities, 1990, 11(12): 1317.

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Isomorphous Substitution of Metallic Elements for Zeolite Y in Aqueous Solution

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