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

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

ISBN-10: 0120078325

ISBN-13: 9780120078325

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

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Extra resources for Advances in Catalysis, Vol. 32

Example text

19b)have suggested that such species perturbed by the strong electrical forces of the quasi-ionic solid would give bands of higher wavenumbers than the above values, due to partial electron withdrawal from antibonding orbitals. In this discussion, the possibility of backbonding from metal orbitals to the antibonding orbitals of oxygen (134c),which will tend to decrease the voo frequency of the dioxygen species, has been neglected. They have suggested that all reported bands on m-Fe2O3 between 1350 and 1250cm-' should be assigned to a perturbed 0; species, intermediate between 0, and O;, and absorption between 1100 and 900 cm-' to perturbed 0:- species, intermediate between 0;and 0;-.

007, which has been attributed to 0; (166). Two kinds of 0; ions adsorbed at Mg2+ and Co3+ sites can be identified (Fig. 1 l ) , together with some evidence for 0;. 987. The large value (gzz) is high for adsorption at a 3 + cation (Fig. 5 G was observed and confirms that the adsorption site is a cobalt ion. It would seem that the bonding in the (Co” . . 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.

149a) have reported IR observations of a negatively charged oxygen species formed when oxygen is adsorbed on chromic oxide absorbing at a frequency of 985 cm-'. The molecular nature of this species was confirmed by isotopic labeling and it was found to convert to an atomic form when the reaction temperature was increased to 200°C. The molecular species was not identified by the authors, but comparison with Raman data on bulk peroxides (149b) where the stretching frequency is near 800 cm-' suggest that the 0-0 bond is very weak and if it is a dioxygen species, it would correspond to 0;- on the surface.

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


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