Download Advances in Catalysis, Vol. 32 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.) PDF

By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

ISBN-10: 0120078325

ISBN-13: 9780120078325

On the grounds that 1948, this serial has sought to fill the space among the papers and the textbooks that train the various components of catalysis examine. This quantity contains articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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Example text

It is more likely, as indicated in Section 11, that a partial electron withdrawal from the antibonding orbitals of the oxygen molecule occurs to form an adsorbed species with some 0;character. C. ). It has been previously treated in an earlier review by the present authors (1) as a dimer 0 - species. Although well known as a bulk peroxide (33b), this ion is difficult to characterize on the surface because it is diamagnetic and would be expected to be infrared inactive. Peroxides are associated with a broad optical absorption at about 260 nm (245a,b),which is very similar to 0;(Section III,A,4).

This case is considered in more detail in the next section. b. Dioxygen Species with Inequivalent Oxygen Nuclei. When the oxygen nuclei are found to be inequivalent, the spectrum is then more complex (Fig. 7) and the analysis as shown later is not always straightforward. For all these species only the A,, components can be resolved and these values, one for each oxygen nucleus, have been used to calculate the total spin densities following the method described earlier. The total spin densities given in Table IV are close to unity, but some minor variations exist, probably due to the difficulty of obtaining reproducible values from the spectra.

0;) complex is more D type than n type and the ionic model is not suitable. No I7O2 work has been reported. Adsorption of oxygen at temperatures above -70°C gives O;, thought to be adsorbed at a Mg2+ MOLECULAR OXYGEN SPECIES ON OXIDE SURFACES 39 I ) 0;IMg2') FIG. 1 1 . 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).

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