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Rutile-type Cr/Sb mixed oxides as heterogeneous catalysts for the ammoxidation of propane to acrylonitrile

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Abstract

Cr/Sb mixed oxides with a rutile-type structure were synthesized by calcining (700 °C) a mixture of oxohydrates obtained by coprecipitation from an alcohol solution containing the required amount of the components. The samples were characterized using X-ray powder diffraction (XRD), FT-IR spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). In the Cr/Sb/O compound prepared with Cr/Sb 1/0.8 (atomic ratio), an almost stoichiometric CrSbO4develops (no antimony or chromium oxides are found), which however is characterized by enrichment in Sb in outmost rutile atomic layers, and thus by a non-homogeneous intracrystalline distribution of the two components. For Cr/Sb ratios lower than 1, the amount of Sb in the rutile-type structure exceeds the stoichiometric value. The reactivity of Cr/Sb/O catalysts with increasing Sb contents (from Cr/Sb 1/0.8 to 1/2.8) is slightly affected by the Cr/Sb atomic ratio. In particular, the selectivity increases with increasing Sb content, while the catalytic activity is higher for the samples having higher Cr/Sb ratios. The Cr/Sb/O system presents considerable differences with respect to the V/Sb/O rutile system; these differences are discussed in reference to the properties of the transition metal components of the rutile mixed oxides.

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Authors and Affiliations

  1. Dipartimento di Chimica Industriale e dei Materiali, Universitá di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy

    N. Ballarini, C. Giunchi, S. Masetti & F. Trifirò

  2. Dipartimento di Chimica Industriale e dei Materiali, Universitá di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy

    F. Cavani

  3. EniTecnologie, Via Maritano 26, S. Donato Milanese, Mi, Italy

    D. Ghisletti

  4. Snamprogetti, Via Maritano 26, S. Donato Milanese, Mi, Italy

    U. Cornaro & R. Catani

Authors
  1. N. Ballarini
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  2. F. Cavani
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  3. C. Giunchi
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  4. S. Masetti
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  5. F. Trifirò
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  7. U. Cornaro
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  8. R. Catani
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Ballarini, N., Cavani, F., Giunchi, C. et al. Rutile-type Cr/Sb mixed oxides as heterogeneous catalysts for the ammoxidation of propane to acrylonitrile. Topics in Catalysis 15, 111–119 (2001). https://doi.org/10.1023/A:1016666202748

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