Catalysis Letters

, Volume 13, Issue 1–2, pp 21–26 | Cite as

Nature of active sites in catalytic ammoximation of cyclohexanone to the corresponding oxime on amorphous silica: E.P.R. investigations

  • D. Pinelli
  • F. Trifirò
  • A. Vaccari
  • E. Giamello
  • G. Pedulli
Article

Abstract

Superoxide radical ions were observed at the surface of an amorphous silica active in the catalytic ammoximation of cyclohexanone with molecular oxygen. They were generated by the contact of oxygen with a thermally activated sample. The presence of organic radicals on the spent catalyst, which probably played a role in the catalytic process, was also observed.

Keywords

Amorphous silica superoxide radical ammoximation 

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1992

Authors and Affiliations

  • D. Pinelli
    • 1
  • F. Trifirò
    • 1
  • A. Vaccari
    • 1
  • E. Giamello
    • 2
  • G. Pedulli
    • 3
  1. 1.Department of Industrial Chemistry and of MaterialsV. le del RisorgimentoBolognaItaly
  2. 2.Department of Inorganic ChemistryPhysical Chemistry and Chemistry of MaterialsTorinoItaly
  3. 3.Department of Organic ChemistryV. San DonatoBolognaItaly

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