S. Meijers et V. Ponec, INFRARED SPECTROSCOPIC STUDY OF THE ADSORPTION OF NITRO-COMPOUNDS ANDAMINES ON COBALT OXIDE, Journal of catalysis, 149(2), 1994, pp. 307-316
The adsorption of nitrobenzene on unsupported and SiO2-supported Co3O4
and a range of adsorbed reaction products of nitrobenzene are studied
by infrared spectroscopy. Products observed after adsorption of nitro
benzene on Co3O4 are aniline, azoxybenzene, and cyclohexylamine (reduc
tion products) at lower temperatures and carbonates and cyanates (oxid
ation products) at higher temperatures. One of the supported cobalt ox
ides appears to be very different from the pure Co3O4, probably due to
cobalt silicate formation during its synthesis. With all samples, the
surface reactivity and adsorption of gases are mostly related to hydr
oxyl groups, but Lewis acid sites ace also present on the surface. (C)
1994 Academic Press, Inc.