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.
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References
L. Cairati and F. Trifirò, J. Catal. 80 (1983) 25.
J.N. Armor, J. Catal. 70 (1981) 72.
J.N. Armor, E.J. Carlson, S. Soled, W.D. Conner, A. Laverick, B. De Rites and W. Gates, J. Catal. 70 (1981) 84.
D.P. Dreoni, D. Pinelli and F. Trifirò, in:Proc. “12 Simposio Ibero Americano de Catalise, Rio de Janeiro 1990, Vol. 2, p. 305.
D.P. Dreoni, D. Pinelli and F. Trifirò, in:Proc. 3rd European Workshop Meeting on Selective Oxidation, Louvain-la-Neuve, 1991, pp. 1–8.
D.P. Dreoni, D. Pinelli and F. Tifirò, J. Mol. Catal. 69 (1991) 171.
D.P. Dreoni, D. Pinelli, F. Tifirò, G. Busca and V. Lorenzelli, J. Mol. Catal. 71 (1992) 101.
R.K. Iler,The Chemistry of Silica (J. Wiley and Sons, New York, 1979).
M. Che and A.J. Tench, Advan. Catal. 32 (1983) 1.
M. Che and E. Giamello, Stud. Surf. Sci. Catal. 57(B) (1990) 265.
Y. Yamada, A. Hasegawa and M. Miura, Bull. Chem. Soc. Jpn. 42 (1969) 1836.
A. Ogata, A. Kazukasa and M. Enyo, J. Phys. Chem. 90 (1986) 5201.
M. Anpo, C. Yun and Y. Kubokawa, J. Catal. 61 (1980) 267.
V.A. Radtsig and A.V. Bystrikov, Kinet, Katal. 19 (1978) 713.
B. Fubini, E. Giamello, L. Pugliese and M. Volante, Solid State Ionics 32/33 (1989) 334.
M. Shiotani, G. Moro and J.H. Freed, J. Chem. Phys. 74 (1981) 2616.
M. Anpo, N. Aikawa, Y. Kubokawa, M. Che, C. Louis and E. Giamello, J. Phys. Chem. 89 (1985) 5689.
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Pinelli, D., Trifirò, F., Vaccari, A. et al. Nature of active sites in catalytic ammoximation of cyclohexanone to the corresponding oxime on amorphous silica: E.P.R. investigations. Catal Lett 13, 21–26 (1992). https://doi.org/10.1007/BF00770943
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DOI: https://doi.org/10.1007/BF00770943