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Effect of precipitation medium and thermal treatment on structure and textural properties of chromium orthophosphates

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Abstract

The effect of the precipitation agent on the structure and textural properties of CrPO4 (Cr/P=1) catalysts has been studied. Catalysts obtained in propylene oxide-aqueous ammonia exhibited higher thermal stability and, hence, greater surface areas and pore volumes than catalysts obtained in propylene oxide or aqueous ammonia exclusively. The former also showed a small surface area decrease on increasing calcination temperature up to 1073 K. Nevertheless, calcination at 1273 K develops in all cases crystalline CrPO4, showing the β-structure. Moreover, CrPO4 catalysts thermally treated below 1273 K only exhibited hydrogen bonded hydroxy groups\((\nu _{{\rm O} - {\rm H}} \simeq 3450 cm^{ - 1} )\).

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Authors and Affiliations

  1. Department of Organic Chemistry, Faculty of Sciences, Cordoba University, Avda. S. Alberto Magno, s/no, E-14004, Cordoba, España

    F. M. Bautista, J. M. Campelo, A. Garcia, D. Luna, J. M. Marinas & M. R. Urbano

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  1. F. M. Bautista
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  2. J. M. Campelo
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  3. A. Garcia
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  4. D. Luna
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  5. J. M. Marinas
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  6. M. R. Urbano
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Bautista, F.M., Campelo, J.M., Garcia, A. et al. Effect of precipitation medium and thermal treatment on structure and textural properties of chromium orthophosphates. React Kinet Catal Lett 49, 173–181 (1993). https://doi.org/10.1007/BF02084045

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  • DOI: https://doi.org/10.1007/BF02084045

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