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Citation: Yang Xun-Min, Zhang Bin, He He-Yong, Gao Zi. Dispersion of α-Fe₂O₃ on NaY Zeolites[J]. Acta Physico-Chimica Sinica, ;1991, 7(01): 16-21. doi: 10.3866/PKU.WHXB19910103 shu

Dispersion of α-Fe₂O₃ on NaY Zeolites

1.
Department of Chemistry, Fudan University

Received Date: 19 July 1989
Available Online: 15 February 1991

The α-Fe_2O_3/NaY zeolite samples were prepared by impregnating NaY zeolite with ammonium ferrioxalate solution and calcining at high temperature. The maximum dispersion amount of α-Fe_2O_3 on NaY zeolite measured with XRD quantitative phase analysis is 0.060 gα-Fe_2O_3/gNaY, which is only 5.5% of the monolayer capacity of α-Fe_2O_3 on NaY according to a close-packed monolayer model. For the first time positron lifetime spectroscopy has been used to detect the dispersion amount of oxide on zeolite. The maximum dispersion amount of α-Fe_2O_3 obtained is fully consistent with that obtained from XRD phase analysis. TPR spectra of the samples show that the reduction of α-Fe_2O_3 on the zeolite consists of two steps, α-Fe_2O_3 is first reduced to Fe_2O_3 at low temperature and then to the metal at higher temperature. Both reduction reactions are ingibited by the strong interaction of the dispersed α-Fe_2O_3 phase with the zeolite.
- α-Fe₂O₃; NaY zeolite; XRD; Positron lifetime spectroscopy
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Dispersion of α-Fe2O3 on NaY Zeolites

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Dispersion of α-Fe₂O₃ on NaY Zeolites