By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
On the grounds that 1948, this serial has sought to fill the distance among the papers and the textbooks that train the various parts of catalysis examine. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.
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Extra info for Advances in Catalysis, Vol. 32
The identification was confirmed by using 1 7 0 2 and the two oxygen nuclei were found to be equivalent, indicating adsorption parallel to the surface (68). Irradiation in the presence of oxygen leads to a more complex spectrum, indicating the MOLECULAR OXYGEN SPECIES ON OXIDE SURFACES 37 presence of several oxygen species (68,156). Superhyperfine interactions can also be observed with nearby protons under some conditions (68,159). The formation of 0; by adsorption of oxygen has been reported on MgO (157)and CaO (71,158)which have been thermally activated in uucuo at high temperature.
Simulations of the spectra have been carried out by Shiotani et a/. (66) on two different assumptions. One is based on a different line width for each line of the doublet (the larger linewidth being associated with the larger hyperfine splitting). The other is that the intensity (or radical concentration) of the 0; giving the smaller hyperfine splitting is twice as large as that of the 0; with the larger hyperfine splitting. This latter assumption contradicts the model of two inequivalent 24 M.
96 which is thought to arise from a donor species such as Zn+ ions (155,167-170). 96, 40 M. CHE AND A . J. 042 (155, 167, 170-1740). The range of gLZvalues indicates that there are several sites on the surface which are all in reasonable agreement with adsorption at a cation charge 2 +. The signal is broadened reversibly by excess (80)indicates equivalent oxygen oxygen in the gas phase. Adsorption of 702 nuclei with a hyperfine tensor of A,, = 80, A,, = 0, and A,, = 15 G corresponding to oxygen adsorbed parallel to the surface.
Advances in Catalysis, Vol. 32 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)