Kinetic analyses using simultaneous TG/DSC measurements

Sanders, J.P.; Gallagher, P. K.

doi:10.1016/s0040-6031(02)00032-1

Cited by 95 publications

(12 citation statements)

References 8 publications

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“…In this study, the range of E α values as determined by the AIC and MLT methods was $175 \le E_\alpha \le$ 200 kJ/mol; these values are in agreement with previous studies[72–76] of the decomposition of CaCO 3 in which the range was $170 \le E_\alpha \le 210$ kJ/mol. However, as discussed herein, these values are considered problematic because they include unreliable values.…”

Section: Methodssupporting

confidence: 91%

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Han

Saito

2012

J Comput Chem

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This article presents, firstly, a short review of methods for evaluating kinetic parameters of solid state reactions and a critical analysis of the isoconversional principle of model free methods. It shows theoretically that the activation energy for complex reactions is not only a function of the reaction degree but also of heating programs, and points out that any method that attempts to extract the dependences of activation energy on conversion degree without considering the dependences of heating programs is problematic. Then an analysis is given of the invariant kinetic parameters (IKP) method and recommends an incremental version of it. Based on the incremental IKP method and model free method, a comprehensive method is proposed that predicts the degree of the dependences of activation energy on heating programs, selects reliable values of activation energy and extracts the values of variable pre-exponential factor. This comprehensive method is tested using both simulation data and experimental data, the results of which show it can not only give reliable values of kinetic parameters but also be helpful in explaining inconsistencies of kinetic results in solid state reactions.

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Section: Methodssupporting

confidence: 91%

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Han

Saito

2012

J Comput Chem

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“…The authors described the decomposition Decomposition kinetics of alkaline earth carbonates by integral approximation method (Cinética de decomposição de carbonatos de terra alcalina pelo método de aproximação integral) mechanism as phase boundary reaction with cylindrical symmetry. Sanders et al [5] performed dynamic kinetic analyses on CaCO 3 decomposition using simultaneous TG and DSC measurements in both wet and dry flowing argon. They discussed the differences in the results in terms of the property measured and the possible influence of the atmosphere on the structural nature of the solid product, CaO.…”

Section: Introductionmentioning

confidence: 99%

Decomposition kinetics of alkaline earth carbonates by integral approximation method

Maitra

Chakrabarty

Pramanik³

2008

Cerâmica

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The decomposition kinetics of four synthetic alkaline earth metal carbonates (MgCO 3 , CaCO 3 , SrCO 3 and BaCO 3 ) was studied under non-isothermal conditions from thermo-gravimetric measurements as compared to. The integral approximation method of Coats and Redfern was used to determine the kinetic parameters for the decomposition processes. The decomposition reactions followed mostly first order kinetics and the activation energy of the decomposition reactions increased with the increase in the molecular mass of the carbonates. The change in enthalpy for the decomposition processes was also calculated and compared with the activation energies for the decomposition processes. The activation energy of the decomposition process for all the carbonates was higher than the enthalpy of the reaction excepting SrCO 3 Keywords: decomposition, alkaline earth carbonates, non-isothermal kinetics, thermogravimetry. Resumo A cinética de decomposição de quatro carbonatos sintéticos de metais de terra alcalina (MgCO

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“…The mass loss rates exhibit a slight increase with the increasing of Na 2 SiO 3 . This may be due to the loss of the silanol group and further condensation reactions of silica, which is similar to the burning of organics. The large mass loss stages at 600∼800 °C can be ascribed to the decomposition of CaCO 3 .…”

Section: Resultsmentioning

confidence: 85%

Polymorphic Crystallization and Diversified Growth of CaCO₃ in HPAM‐HABS‐Na₂SiO₃ Hybrid Solutions

et al. 2018

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CaCO3 crystallization is a controversial topic hampered in part by the lack of empirical evidence of the growth of polymorphic crystals. In this work, great effort has been made to investigate the polymorphic crystal growth mechanism and the diversified morphologies, including peanut, shuttle, worm‐like and irregular cubic CaCO3 that occur in hydrolysed polyacrylamide (HPAM) ‐ heavy alkylbenzene sulfonate (HABS) ‐ Na2SiO3 hybrid system. It is verified that silica has an inhibition effect during the phase‐transformation of CaCO3. With the addition of HPAM, a new morphology of CaCO3 composited with CaCO3 fibres was received in the HPAM‐Na2SiO3 mixed solution. In the ternary additive system, the template effect of HPAM is undermined by HABS, and HPAM forms a new polymer‐surfactant complex conformation. Meanwhile, the inhibition effect of silica is weakened with the increase of organics.

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Kinetic analyses using simultaneous TG/DSC measurements

Cited by 95 publications

References 8 publications

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Decomposition kinetics of alkaline earth carbonates by integral approximation method

Polymorphic Crystallization and Diversified Growth of CaCO₃ in HPAM‐HABS‐Na₂SiO₃ Hybrid Solutions

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Kinetic analyses using simultaneous TG/DSC measurements

Cited by 95 publications

References 8 publications

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Comprehensive method based on model free method and IKP method for evaluating kinetic parameters of solid state reactions

Decomposition kinetics of alkaline earth carbonates by integral approximation method

Polymorphic Crystallization and Diversified Growth of CaCO3 in HPAM‐HABS‐Na2SiO3 Hybrid Solutions

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Product

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Polymorphic Crystallization and Diversified Growth of CaCO₃ in HPAM‐HABS‐Na₂SiO₃ Hybrid Solutions