When kaolinite is heated under pressures of self‐generated H 2 O vapor from 0.4 to 3.2 atm, the dehydroxylation is best described by a nucleation‐and‐growth equation with m varying from 1.10 to 2.16 as the pressure is increased. The temperature coefficient of the rate constant, expressed as an apparent activation energy, varies from 62.4 to 260 kcal/mol. The H 2 O vapor evolved in a self‐generated‐atmosphere sample holder was automatically swept into a gas chromatograph at fixed intervals. The measurement is specific for H 2 O.
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Anthony et al. (1974) studied this question.
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