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Characterisation of the active phase in caesium-doped iron-vanadium-oxide catalysts for the selective oxidation of polyaromatics

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Abstract

The addition of caesium sulphate to unsupported vanadium-iron-oxide materials leads to the formation of an amorphous non-stoichiometric phase, as well as the crystalline phases, FeVO4, Fe2V4O13, and Fe1-XS (pyrrhotite). Caesium was only present in the amorphous parts of the sample, and the amount of the new phase formed was found to vary depending on the vanadium:iron ratio and the amount of caesium dopant added. The new phase contains Fe3+ ions with oxide lattice vacancies in their coordination sphere, i.e. Fe3+-VO(e-) species. Catalytic testing demonstrated that the caesium-doped samples were more selective for the oxidation of fluorene to 9-fluorenone. The role of the caesium is probably to modify the surface acidity of the catalyst and act in the formation of stable oxide lattice vacancies.

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Authors
  1. A.P.E. York
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  2. A. Brückner
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  3. P.-M. Wilde
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  4. H. Mehner
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  5. M. Kraum
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  6. M. Baerns
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York, A., Brückner, A., Wilde, PM. et al. Characterisation of the active phase in caesium-doped iron-vanadium-oxide catalysts for the selective oxidation of polyaromatics. Catalysis Letters 43, 107–115 (1997). https://doi.org/10.1023/A:1018926219595

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