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Kinetics of Kaolinite Dehydroxylation
Author(s) -
ANTHONY GAYLORD D.,
GARN PAUL D.
Publication year - 1974
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1974.tb10835.x
Subject(s) - nucleation , kaolinite , activation energy , kinetics , analytical chemistry (journal) , mineralogy , atmosphere (unit) , vapor pressure , chemistry , partial pressure , reaction rate constant , materials science , thermodynamics , chromatography , oxygen , organic chemistry , physics , quantum mechanics
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.