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Thermal Dehydration of Lithium Sulfate Monohydrate Revisited with Universal Kinetic Description over Different Temperatures and Atmospheric Water Vapor Pressures
journal contribution
posted on 2020-05-22, 18:36 authored by Yui Yamamoto, Loic Favergeon, Nobuyoshi KogaThis
study aims to universally describe the kinetic features of
the thermal dehydration of lithium sulfate monohydrate across different
temperatures (T) and atmospheric water vapor pressures
(p(H2O)) as a model reaction of the thermal
dehydration of crystalline hydrates. The features of the physicogeometrical
consecutive process, comprising the induction period (IP)–surface
reaction (SR)–phase boundary-controlled reaction (PBR), and
the effect of p(H2O) on kinetic behavior
were revealed experimentally under various heating conditions. Then,
the accommodation function (AF), accounting for the effect of p(H2O) on the kinetic behavior, was derived by
considering the consecutive/concurrent elementary steps of SR and
PBR at the atomic and molecular levels. The universal kinetic descriptions
for the IP and subsequent mass-loss process were realized by introducing
the AF into formal kinetic equations and using the isoconversional
kinetic relationship. Furthermore, by combining the physicogeometrical
consecutive IP–SR–PBR(n) model and
the formulated AF, the universal kinetic descriptions for each physicogeometrical
reaction step across different T and p(H2O) conditions were obtained, which reveal novel kinetic
features of each reaction step and these variations as the reaction
step advances. The significance of the revealed kinetic features is
discussed through demonstrating the development of the novel kinetic
approach.
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Keywords
water vapor pressuresphysicogeometrical reaction stepUniversal Kinetic Descriptionreaction stepPBRinduction periodThermal Dehydrationaccommodation functionLithium Sulfate Monohydrate RevisitedSRH 2 OAtmospheric Water Vapor Pressuresheating conditionsmodel reactionmass-loss processAFIPDifferent Temperaturesreaction step advanceslithium sulfate monohydrate
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