Theoretical free energy of activation for dehydration of hydrated ions in solution

Abstract

Dehydration of Hydrated Ions in Solution 1245 C112O is 23 kcal/mol while for CuO is 25 kcal/mol. This latter oxide is partly reduced to CU2O at least on the surface, due to the pretreatment adopted in catalysis (480°, 4 hr, 10-5 Torr). Consequently, its activity and its Ea are attributed to Cu+ .14 On the other hand, the Ea values obtained for the MCu specimens clearly resemble that found on CU2O. In these specimens the Cu+ content, formed during the outgassing treatment, can be evaluated by the esr methods only indirectly. In Table III an attempt to correlate the amount of Cu+ formed and the catalytic activity of some MCu specimens is made. The table reports the fraction of surface sites occupied by Cu+ ions, calculated from the decrease of Cu2+surface per unit surface area together with the absolute rate constant (kaba) at 350°for the N2O decomposition. It may be noted that the amount of reduced Cu+ formed parallels the increase in activity, thus suggesting that the main active sites in the N2O decomposition can be identified as Cu+ ions.

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