Get Advances in Catalysis, Vol. 32 PDF

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

ISBN-10: 0120078325

ISBN-13: 9780120078325

When you consider that 1948, this serial has sought to fill the space among the papers and the textbooks that train the varied components of catalysis examine. This quantity comprises articles at the functions of adsorption microcalorimetry and natural syntheses utilizing aluminosilicates.

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191) and by Setaka and Kwan (182)for CeO, on A l , 0 3 . A large giWvalue is found also for 0; on UO,/AI,O, (182). Probably the simple ionic model is not suitable for these systems, which have an unpaired electron in extended f orbitals. 010. 010 is also involved. This would bring the results of Steinberg and Eyal in line with those of Loginov et a/. 055, g,,,. 9995, are in reasonable agreement with our new assignments. Loginov et ul. (1Y4) have looked at 0; on a number of rare-earth oxides which have preadsorbed gases such as H, and CO.

This cleans the surface and produces a slight nonstoichiometry or valence change in the metal oxide so that the surface adsorbs oxygen readily. (ii) For stoichiometric oxides, UV or y irradiation has often been used after thermal treatment to provide excess electrons at the surface. The oxygen species are produced by adding oxygen to the samples after irradiating either in uucuo or in a reducing atmosphere; alternatively, by contacting the thermally treated sample with oxygen and then irradiating it in oxygen.

An anionic coadsorbate is formed with 70,which shows a hyperfine pattern characteristic of nonequivalent oxygen nuclei. On MgO (63)a complex ion (C0,-0,)- is formed with A,, of 100 and 50 G. It seems likely that 0, is adsorbed on top of the adsorbed CO, or CO but that the unpaired electron is localized very largely on the adsorbed 0,. Calculations by Ben Taarit et al. 5A are assumed for (C0,-O,)-. A similar species has recently been reported on the CrO,/SiO, system with A,, of 98 and 42 G (86)and on the MoO,/SiO, system with A,, of 104 and 40 G (87) (Fig.

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


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