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Alkali-hydrogen exchange kinetics

There are a number of mechanisms that pose potential problems to predicting dissolution rate kinetics as the system approaches saturation. Part of this conundrum originates from current models of glass corrosion kinetics that cannot yet incorporate these unanticipated phenomena into a mathematical equation that is consistent with the constraints of thermodynamics or kinetics. These phenomena include (1) alkali-hydrogen exchange (2) dissimilar reactivity of... [Pg.582]

Hydrogen Transfer. - Both experimental and theoretical approaches have been used to study the reactivity of w-butyrophenone included in alkali-metal-exchanged zeolites. The results indicate that with smaller cations the Norrish Type I process is enhanced over the Norrish Type II reaction. " Others have reported that the photochemical decomposition of w-butyrophenone in a variety of solvents follows first-order kinetics. ... [Pg.11]

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