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Article Dans Une Revue Chemical Engineering and Technology Année : 2006

A practical method to derive sample temperature during nonisothermal coupled thermogravimetry analysis and differential scanning calorimetry experiments

Résumé

Nonisothermal thermogravimetry differential scanning calorimetry (TG-DSC) mounting is intensively used for the determination of kinetic parameters and reaction heat along the chemical transformation of a solid. Nevertheless, when tests are performed with heating rates as high as those encountered in industrial processes, e.g., several tens of K min-1 , there is great uncertainty in the knowledge of the exact sample temperature. In this work, a method to derive a simple mathematical expression is proposed and fully described in order to calculate the real sample temperature throughout a temperature-ramped test on a commercial apparatus. The furnace temperature and the heat flow signals were used, together with the crucible specific heat and the heating rate. A number of validation tests were performed to derive similar reaction rates for a reference. First-order kinetic reactions were presented and reconciled over a large range of heating rates from 3 to 50 K min-1 .
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Dates et versions

hal-01847589 , version 1 (06-11-2018)

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Sylvain Salvador, Jean Henry Ferrasse. A practical method to derive sample temperature during nonisothermal coupled thermogravimetry analysis and differential scanning calorimetry experiments. Chemical Engineering and Technology, 2006, 29 (6), p.696-702. ⟨10.1002/ceat.200600022⟩. ⟨hal-01847589⟩
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