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


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.


Amorphous silica superoxide radical ammoximation 


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  1. [1]
    L. Cairati and F. Trifirò, J. Catal. 80 (1983) 25.Google Scholar
  2. [2]
    J.N. Armor, J. Catal. 70 (1981) 72.Google Scholar
  3. [3]
    J.N. Armor, E.J. Carlson, S. Soled, W.D. Conner, A. Laverick, B. De Rites and W. Gates, J. Catal. 70 (1981) 84.Google Scholar
  4. [4]
    D.P. Dreoni, D. Pinelli and F. Trifirò, in:Proc. “12 Simposio Ibero Americano de Catalise, Rio de Janeiro 1990, Vol. 2, p. 305.Google Scholar
  5. [5]
    D.P. Dreoni, D. Pinelli and F. Trifirò, in:Proc. 3rd European Workshop Meeting on Selective Oxidation, Louvain-la-Neuve, 1991, pp. 1–8.Google Scholar
  6. [6]
    D.P. Dreoni, D. Pinelli and F. Tifirò, J. Mol. Catal. 69 (1991) 171.Google Scholar
  7. [7]
    D.P. Dreoni, D. Pinelli, F. Tifirò, G. Busca and V. Lorenzelli, J. Mol. Catal. 71 (1992) 101.Google Scholar
  8. [8]
    R.K. Iler,The Chemistry of Silica (J. Wiley and Sons, New York, 1979).Google Scholar
  9. [9]
    M. Che and A.J. Tench, Advan. Catal. 32 (1983) 1.Google Scholar
  10. [10]
    M. Che and E. Giamello, Stud. Surf. Sci. Catal. 57(B) (1990) 265.Google Scholar
  11. [11]
    Y. Yamada, A. Hasegawa and M. Miura, Bull. Chem. Soc. Jpn. 42 (1969) 1836.Google Scholar
  12. [12]
    A. Ogata, A. Kazukasa and M. Enyo, J. Phys. Chem. 90 (1986) 5201.Google Scholar
  13. [13]
    M. Anpo, C. Yun and Y. Kubokawa, J. Catal. 61 (1980) 267.Google Scholar
  14. [14]
    V.A. Radtsig and A.V. Bystrikov, Kinet, Katal. 19 (1978) 713.Google Scholar
  15. [15]
    B. Fubini, E. Giamello, L. Pugliese and M. Volante, Solid State Ionics 32/33 (1989) 334.Google Scholar
  16. [16]
    M. Shiotani, G. Moro and J.H. Freed, J. Chem. Phys. 74 (1981) 2616.Google Scholar
  17. [17]
    M. Anpo, N. Aikawa, Y. Kubokawa, M. Che, C. Louis and E. Giamello, J. Phys. Chem. 89 (1985) 5689.Google Scholar

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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