By Gould R.F. (ed.)
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Extra resources for Molecular Association in Biological and Related Systems
They intcrprct their results instead as an example of the "twin peak" patterii of transitioii metal ion properties, the very low activity a t Fez03 representing the stability of the d5 configuration. There is some doubt about the validity of certain of their experimental results: in our experience, for example, nickel oxide does not show activity in IIz-Dz exchange until it, is superficially reduced. This series has the merit of a common crystal field for the cation (corundum structurr) and a n appreciable resistance to reduction by hydrogen.
For ethylene oxide formation, CL&(,) f O(&) = C&O(,d,), the heat is 15 kcal. [not 2 kcal. as previously stated ( I S ) ]; for acetaldehyde formation, -40 kcal. ; for formaldehyde formation C2H4(,) 2 0 ( a d a ) = 2CHz0(ads),the heat is about 100 kcal. Thus one may judge that one molecule is often reacting with two atoms of adsorbed oxygen in the initial increments, but with later increments t,he main reaction is with single atoms to give adsorbed acetaldehyde or ethylene oxide. + IV. The Emergence and Significance of the Electronic Factor A.
G. temperature, dopents) will tend to be specific rather than subject t o broad generalization. We shall have occasion to see this in Section V. This necessarily limits the scope of purely physical theories such as that of Hauffe (67’). Also, although Wolkenstein (68) makes formal allowance for these factors in recognizing “weak” chemisorption, until this concept is developed in more chemical terms it would seem that his approach is similarly limited. But a t the same time we should recognizc that the correlation of activity with d-electron configuration is equally subtle.