引用本文:
杨雪敏, 章彬, 贺鹤勇, 高滋. α-Fe2O3在Y沸石上的分散[J]. 物理化学学报,
1991, 7(01): 16-21.
doi:
10.3866/PKU.WHXB19910103
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
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
α-Fe2O3在Y沸石上的分散
摘要:
用草酸高铁铵浸渍NaY沸石, 并在高温下焙烧, 得到α-Fe_2O_3/NaY沸石体系。经XRD相定量外推法测定, α-Fe_2O_3在NaY沸石上的最大分散量为0.060 gα-Fe_2O_3/gNaY, 仅占α-Fe_2O_3在沸石表面密置单层量的5.5%。首次尝试用正电子寿命谱方法测定α-Fe_2O_3在沸石表面的最大分散量, 所得结果与XRD方法完全吻合。由程序升温还原方法发现沸石上α-Fe_2O_3的还原分两步进行, α-Fe_2O_3先还原成Fe_3O_4, 然后再还原成金属。α-Fe_2O_3分散相与沸石之间的强相互作用, 使这两个还原反应受到阻抑。
English
Dispersion of α-Fe2O3 on NaY Zeolites
Abstract:
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.
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