Download e-book for iPad: Advances in Catalysis and Related Subjects, Volume 25 by Daniel Douglas Eley, etc.

By Daniel Douglas Eley, etc.

ISBN-10: 0120078252

ISBN-13: 9780120078257

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

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Extra resources for Advances in Catalysis and Related Subjects, Volume 25

Sample text

The electronic properties of silver aggregates change from a semiconductor type at a few atoms toward a metal type at several atoms. , spacing of a few kT between energy levels). Figure 6 shows the energy gap between HOMO and LUMO as a function of aggregate size for linear aggregates. Apparently the ZP and EA are converging t o a value =7 eV. These results indicate a longwavelength shift in light absorption as particle size increases. This effect is consistent with experiments by Comes (43) on the absorption of Ag particles as size changes.

All orbitals including 4d, Ss, and 5 p are included in this calculation. As the data in Table I11 indicate, EH is better than CNDO in predicting R, and BE, and the CNDO procedure predicts a longer-range interaction. For IP, CNDO is more accurate. The IP of Ag2 is experimentally less 18 ROGER C. BAETZOLD 1 I I I I I 2 4 6 8 10 Internuclear distance (A") FIG. 1. 3; curve B-EH, Eq. (8); curve C-complete neglect of differential overlap. than the ZP of Ag atom, and only the CNDO calculation is in accord with this trend.

It is expected that similar trends will be found in other Group IBVIII alloy systems. 34 ROGER C. 0- - 0 0 1 20 I I 40 60 80 100 IV. Chemisor ption A. SCOPE The MO procedure has recently been applied t o adsorbates o n a wide variety of substrates. We shall be concerned primarily with the effect of substrate o n electronic properties of adsorbed atoms. Clusters of Ag and Pd on nonionic (carbon) substrate and ionic (AgBr) substrate have been examined for this effect. In addition, properties of small atomic number adatoms on graphite were calculated in an extensive study, which is reviewed here.

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Advances in Catalysis and Related Subjects, Volume 25 by Daniel Douglas Eley, etc.


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