부산대학교 도서관

Alkaline hydrides MH are insoluble in all known solvents. Dispersed in strictly anhydrous solvents, KH has an extraordinary behavior with respect to Brønsted acids HA:  it reacts with difficulty with strong acids, but reacts readily with weak acids. The reason for this behavior is ascribed to the fact that the reaction K⁺H^-(s) + HA(sol) → K⁺A^-(s) + H2(g) does not occur via an acid−base pathway, but via electron transfer from H^- to HA. A model is proposed for the autocatalytic activation of acid−base reaction due to the presence of a superficial layer of adsorbed K⁺ A^- ionic pairs. The effect of these ionic pairs is to reduce the activation energy for the acid−base pathway. This model predicts that in some conditions the production rate of H2 formed via the acid−base pathway oscillates with time.