Catalysis Letters

, Volume 32, Issue 1–2, pp 215–226 | Cite as

Enhancement of catalytic activity of the ammonium/potassium salt of 12-molybdophosphoric acid by iron ion addition for the oxidation of isobutane to methacrylic acid

  • F. Cavani
  • E. Etienne
  • M. Favaro
  • A. Galli
  • F. Trifirò
  • G. Hecquet
Article

Abstract

The oxidation of isobutane to methacrolein and methacrylic acid was carried out over potassium/ammonium salts of 12-molybdophosphoric acid (Keggin-type heteropoly compounds), with overall selectivity to the desired products higher than 50%. The addition of iron to the catalyst composition led to a substantial enhancement of the catalytic activity, with an increase in the yield to the desired products, even though the selectivity decreased. The catalysts all have a secondary cubic structure, and are stable in the reaction environment. No trace of structural decomposition was found in spent catalysts. It was found that the addition of iron led to a substantial increase in the catalyst acidity and it is proposed that the Lewis acidity might play a role in the activation of the paraffin.

Keywords

heteropoly compounds isobutane oxidation methacrylic acid methacrolein iron 

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Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • F. Cavani
    • 1
  • E. Etienne
    • 1
  • M. Favaro
    • 1
  • A. Galli
    • 1
  • F. Trifirò
    • 1
  • G. Hecquet
    • 2
  1. 1.Dipartimento di Chimica Industriale e dei MaterialiBolognaItaly
  2. 2.Elf AtochemCedex 42, 92091 Paris La DefenseFrance

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