February 11, 2018

Download e-book for kindle: Advances in Catalysis and Related Subjects, Volume 8 by W G Frankenberg

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

The same holds for ions of these elements. The sulfite ion acts as a poison; the sulfate ion does not: The former is bound by a coordinate link, aided by an image force of the ionic charge, which, however, is rather weak here because of the relatively large distances of the negative excess charges from the metal. The sulfate ion exhibits this image force only. In both cases there are the van der Waals’ forces as well, which also will be weak here. Suhrmann (62) explains the strong increase of the normal photoelectric effect of metals caused by the adsorption of water molecules and also by the molecules of ammonia, by accepting similar coordinate links t o function in the chemisorption of these molecules.

V,12). 2. Nonpolar van der Waals’ Forces on Conducting Surfaces The adsorption by nonpolar van der Waals’ forces on metal surfaces demands a separate treatment. Many attempts have been made t o consider the metal as an ideally polarizable structure. As Margenau and Pollard (31) pointed out, there is a serious objection against such a use of the so-called “image” picture. The inducing fields of the continually changing dipoles in a nonpolar molecule change so rapidly that the conduction electrons in the metal are incapable of following their movements.

27 ADSORPTION PHENOMENA As we shall see in the next section, the potential energy of two atoms attracting each other with nonpolar van der Waals’ forces will decrease according t o a Eaut = - (3) r6 where a is a constant and r is the distance between the atoms. 2. Ratio r,,,/rc as a function of r,. The theoretical lines A and B are drawn with the repulsion law (2) for TZ = 12 and n = 10 respectively. , as found from the lattice energies of alkali halides. Experimental points for several alkali halides of the NaCl type are shown a8 +.

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


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