By Vladimir Ponec and Geoffrey C. Bond (Eds.)
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Extra resources for Catalysis by Metals and Alloys
IO o F / o 1. l l 1 1 1 = - t [ The total contribution by s, p bonding is then subtracted, values being taken from graphs such as that in figure 8, and the rest of the binding energy is divided by the number of unpaired d-electrons. For example, hcp cobalt is expected to have the configuration dTsp. From the sum of all d-orbitals, two should be occupied by pairs of electrons and three by unpaired electrons. The maximum possible number of unpaired electrons is considered as the ground state configuration.
However, the change in the number of the sp-electrons leads according to the Engel-Brewer theory to a change in the number of d-electrons. Thus, it was expected , that the number of d-electrons could be varied by changing the composition of the alloys. It was not appreciated in this approach that the Engel-Brewer theory makes an assumption about the electronic configuration of the free atoms from which the alloy is made. The Engel-Brewer theory does not draw any conclusion about the electronic structure of the solid alloys and of course says nothing about the surface composition of alloys.
From the jellium edge. The shaded area indicates the positive background of 7ellium'. u. 053 nm). ; the parameter rs = 2 describes the somewhat high density of the positive charge, for example in a metal such as Al or Pb. 2 Chemisorption of undissociated molecules The main features of the theory dealing with this problem can be best understood by taking adsorption of carbon monoxide as an example. Metals can be classified into the following groups. (i) The block of metals between Sc to La (on the left side) and Cr to W (on the right side).
Catalysis by Metals and Alloys by Vladimir Ponec and Geoffrey C. Bond (Eds.)