New PDF release: Advances in Catalysis and Related Subjects, Volume 8

By W G Frankenberg

ISBN-10: 0080565123

ISBN-13: 9780080565125

ISBN-10: 0120078082

ISBN-13: 9780120078080

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Extra info for Advances in Catalysis and Related Subjects, Volume 8

Example text

E q u a h n (26) could then be used t o calculate the contribution t o the adsorption energy due t o this polarization. It is not necessary to calculate F , however, as E, is immediately given by Some figures obtained in this way for gases adsorbed on charcoal are given in Table I. 1 It is clear that this effect leads t o a rather important contribution t o the adsorption energy, if not t o the most important, in those cases of adsorption of gases on conducting surfaces where no chemical interaction results.

The distances, however, from the ions of the outer layer to those of the second layer may have undergone material alterations. I n a theoretical study Verwey ( 7 ) came to the conclusion th a t the negative surface ions of the free surfaces of alkali halide crystals are generally displaced, so that their distances from the next layers of the lattice are increased, and the positive surface ions are displaced toward the inside of the lattice. ;whereas the chloride ions of the outer layer are located a t a distance of 2;86 8.

17), the force acting in opposite direction. Surface spots exactly in between surface ions, do not exercise electrostatic forces on an adsorbed ion. Therefore, a t the short distances over which the electrostatic surface forces are active they cause a periodical unhomogeneous field. The movement of a single adsorbed ion over the surface may be hampered by these variations. I n all these electrostatic considerations the surface of the ionic crystal was idealized, as described in Sec. IV,2, as if it were cut by means of an ideally sharp razor blade.

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Advances in Catalysis and Related Subjects, Volume 8 by W G Frankenberg


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