By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
Given that 1948, this serial has sought to fill the distance among the papers and the textbooks that educate the various components of catalysis examine. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Additional info for Advances in Catalysis, Vol. 32
2 G. This corresponds to adsorption at an A13+ site. On "Mo03/Mg0, there is no indication of Mo6+ sites available either at 77 K or at 300 K. The 0; ions are adsorbed on Mg2+ sites (108). The superhyperfine tensor has also been used to derive the amount of spin delocalization on the cation leading to the superhyperfine structure. In view of what has been said above on the origin of the superhyperfine interaction, the result must be handled with caution. Thus, the unpaired electron 30 M. CHE AND A.
These species have similar hyperfine parameters and also appear to be very similar to the organic peroxy radicals and SiOO in the bulk (Table IV). There are at present few examples in this class of adsorbed species formed by secondary reactions (96). It is relevant here to mention that I7O has been used to study related dioxygen radicals in the biochemical field. For example, Bray et a / . (100) reported that a dioxygen species, formed enzymatically in aqueous solution and then cooled to 77 K, had equivalent oxygen nuclei with A,, = 72 G, in good agreement with the data in Table 111.
No work with I7O2 has been reported to check these two possibilities. 002 for 0;. Although the authors did not discuss the adsorption site, the gzz value suggests that the 0; ion is adsorbed on A13+ rather than on CdZ+,in agreement also with the line shape of the signal, which indicates probable broadening due to 27AI nuclei. 3. 896 which has been attributed to donor electrons (183). Oxygen adsorption gives a complex signal (183-186). 5 G (74). This seems unlikely in view of the fact that only the major species shows a hyperfine splitting with "0.