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Citation: Yang Li-Ying, Chen Shu, Xu Wen-Qing, Li Guo-Ying, YIN Yuan-Gen. Identification of γ-Fe₂O₃ in Ferrite-ferric Oxide Catalysts Using Second Derivative IR Spectra[J]. Acta Physico-Chimica Sinica, ;1994, 10(02): 164-167. doi: 10.3866/PKU.WHXB19940215 shu

Identification of γ-Fe₂O₃ in Ferrite-ferric Oxide Catalysts Using Second Derivative IR Spectra

1.
Department of Chemical Engineering, Beijing Institute of Chemical Fibre Technology, Beijing 100029

Received Date: 8 June 1992
Available Online: 15 February 1994

It is well known that γ-Fe_2O_3 is a very active and selective catalyst for okidative dehydrogenation ofbutene to butadiene. It is hard, however, to distingulsh between ferrite spinels and therefore to identify its existence in ferrite-ferric oxide catalysts using XRD. On the IR spectra γ-Fe_2O_3 has characteristic bands in the range of 600~800 cm~(-1), which do not exist for α-Fe_2O_3, Fe3O4, ZnFe_2O_4 and MgFe_2O_4. But these bands are too weak to deterAnne for the small amount of γ-Fe_2O_3, e g. less than 30% (mass fraction), in catalysts.
Usually using second derivative IR spectra can increase the analytical sensitivity substantially. The mechanical mixtures of γ-Fe_2O_3 and MgFe_2O_4 in different ratio were prepared and their second derivative IR spectra were taken. It was found that the bands 730 and 695 cm~(-1) were characteristic of γ-Fe_2O_3 and their intensities increased with the content of γ-Fe_2O_3 in the mixtures. A staight line with R=0.994 can describe the relation between γ-Fe_2O_3 content and the peak area of band 695 cm~(-1). The lowest detectable content of γ-Fe_2O_3 is about 1% (mass fraction). The existence of γ-Fe_2O_3 in the used B-02 comercial catalyst was identified by this method.
- Second derivative IR spectrm,
- γ-Fe₂O₃,
- Ferrite,
- Spinel,
- Oxidative dehydrogenation of butenes
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沈阳化工大学材料科学与工程学院沈阳 110142

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Identification of γ-Fe2O3 in Ferrite-ferric Oxide Catalysts Using Second Derivative IR Spectra

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通讯作者: 陈斌, bchen63@163.com

Identification of γ-Fe₂O₃ in Ferrite-ferric Oxide Catalysts Using Second Derivative IR Spectra