Ketone adsorption by montmorillonite was found to be greatly influenced by the nature of the exchangeable cation. Mechanisms of bonding included (i) direct ion‐dipole interaction of the carbonyl with the ion in cases where the ion had a low hydration energy or where special treatments were used to dehydrate the ion; (ii) outer sphere coordination to the metal ion by bridging through directly coordinated water molecules; (iii) formation of electrovalent bonds through proton donation by 2,4 pentanedione to the clay saturated with Al or Cu ions to form the acetylacetonates of these ions.
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Parfitt et al. (1968) studied this question.
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