By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
Considering the fact that 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the various parts of catalysis learn. This quantity contains articles at the purposes of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra info for Advances in Catalysis, Vol. 32
The EPR spectra at 77 K of 0; on COO-MgO samples. Spectra (a) and (b) were recorded after evacuation of oxygen at 298 K, (c) and (d) in the presence of a small amount of oxygen. 2%COO-MgO sample, whereas spectra (b) and (d) refer to a 5", Coo-MgO sample (the cobalt concentration is expressed as Co atoms per 100 Mg atoms) (110). 062). The (Co3+. . 0;) complex disappears entirely at 25°C and is thought to form Oi-, although there is also an increase in the concentration of 0; adsorbed on Mg2+ ions.
0028 and A , = 47, A , = 58, A 3 = 47 G, the former disappearing at lower temperatures (200°C) than the latter (300°C). 13. The EPR spectra at 77 K of 0 ; ion on SnO, pretreated at 400 C (a) in (b) in hydrogen (188). L'IICUO or MOLECULAR OXYGEN SPECIES ON OXIDE SURFACES 43 Recent experiments using thermal treatment in uucuo and hydrogen (Fig. 13) and a Q-band spectrometer suggest that the hypothesis of Anufrienko et al. is not correct and that the complex spectrum is best explained by the presence of 0; stabilized on Sn4+ ions in different environments (188).
Although well documented in the solid state, no optical absorption or luminescent spectra have been reported for 0; on an oxide surface even where EPR has shown the ion to be present on, for example, zeolites (127h) or the alkaline-earth oxides (128, 129). This may arise because absorption from surface oxide ions in low coordination occurs at about the same energy as the optical absorption for 0; in the oxides such as MgO (f30,131). The 0; ion is not normally expected to be active in the IR but laser Raman studies on the crystalline alkali metal superoxides have led to the assignment of frequencies between 1137 and 1164 cm-' to the 0-0 stretching vibration (21, 132).
Advances in Catalysis, Vol. 32 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)