Thermodynamic properties of chlorite CCa-2. Heat capacities, heat contents and entropies

Gailhanou, Hélène; Rogez, J.; Miltenburg, J.C. van; Genderen, A.C.G. van; Grenèche, Jean‐Marc; Gilles, C.; Jalabert, D.; Michau, Nicolas; Gaucher, Éric C.; Blanc, Philippe

doi:10.1016/j.gca.2009.04.040

Cited by 34 publications

(14 citation statements)

References 37 publications

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“…For all the studied clay minerals, there was no magnetic anomaly caused by magnetic transition of iron, detected in the C p curves of the samples at very low temperatures (T < 10 K). A similar result had been obtained in the case of the ripidolite CCa-2 (Gailhanou et al, 2009), which nevertheless contained more iron compared with the present clays.…”

Section: Calorimetric Entropysupporting

confidence: 89%

“…Chemical analyses of the samples (Table 1) were performed using a series of standard techniques (X-ray fluorescence and volumetric methods) already detailed in Gailhanou et al (2007Gailhanou et al ( , 2009). X-ray diffraction (XRD) analyses were performed on a Siemens D5000 diffractometer equipped with variable slits, a Co anticathode and a diffracted beam monochromator to characterise and quantify impurities and clay phases.…”

Section: Analysis and Characterisation Of The Samplesmentioning

confidence: 99%

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Thermodynamic properties of illite, smectite and beidellite by calorimetric methods: Enthalpies of formation, heat capacities, entropies and Gibbs free energies of formation

Gailhanou

Blanc

Rogez

et al. 2012

Geochimica et Cosmochimica Acta

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Section: Calorimetric Entropysupporting

confidence: 89%

Section: Analysis and Characterisation Of The Samplesmentioning

confidence: 99%

Thermodynamic properties of illite, smectite and beidellite by calorimetric methods: Enthalpies of formation, heat capacities, entropies and Gibbs free energies of formation

Gailhanou

Blanc

Rogez

et al. 2012

Geochimica et Cosmochimica Acta

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“…Calorimetric measurements are described in detail in Gailhanou et al (2007Gailhanou et al ( , 2009Gailhanou et al ( , 2012Gailhanou et al ( and 2013 and Blanc et al (2014a). A compilation of the measured thermodynamic properties is provided in Table 1.…”

Section: Clay Mineralsmentioning

confidence: 99%

ThermoChimie database developments in the framework of cement/clay interactions

Blanc

Vieillard

Gailhanou

et al. 2015

Applied Geochemistry

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“…The structural formulas of chlorite reported in available thermodynamic studies are listed in Table 3. Among them, Gailhanou et al (2009) used a chlorite that has the closest composition to that from Lowson et al (2007) Gailhanou et al (2007) obtained a Gibbs free energy of formation for chlorite to be −7607.1 kJ/mol at room temperature and pressure based on corresponding enthalpy and entropy of formation (−8253.70 kJ/mol and − 2170 J/mol/K, respectively). Thermodynamic parameters of this chlorite are listed in Table 4 together with those for aqueous species from Anderson(2005).…”

Section: Dependence Of Dissolution Rate On Phmentioning

confidence: 99%

Chemical affinity and pH effects on chlorite dissolution kinetics under geological CO2 sequestration related conditions

et al. 2015

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The kinetic dissolution of Flagstaff Hill chlorite (CCa-2 from Clay Minerals Society), (Mg 4.55 Al 1.23 Fe 0.12 ) (Al 1.04 Si 2.96 )O 10 (OH) 8 , was investigated using a well-mixed flow-through reactor at 100°C, pH values ranging from 3.0 to 7.5, and variable saturation states. The objective was to measure the dependence of chlorite dissolution rate on pH as well as on degree of undersaturation under conditions applicable to geologic carbon storage. A batch experiment was conducted to determine the equilibrium constant of the dissolution reaction at 100°C for the chlorite mineral phase used in this study. A series of experiments was run at varying CO 2 partial pressures (0-60 bars) and different flow rates (0.01-0.25 ml/min). We use our experimental results in conjunction with previously published data to separate the effects of pH and solution saturation state. At constant pH, the chlorite dissolution rate decreases slowly as a function of the Gibbs free energy of reaction (ΔG r ), which is a quantitative measure of the degree of undersaturation. The undersaturation required (−ΔG r N 100 kJ/mol) to reach a limiting far-from-equilibrium rate (the "dissolution plateau") is roughly an order of magnitude larger than expected from transition state theory, but similar to that determined for smectite (− ΔG r N 130 kJ/mol) (Cama et al., 2000). Hence, chlorite dissolution behaves as if the chlorite were close to equilibrium even in solutions that are strongly undersaturated. The chlorite dissolution rate (R) as a function of pH and chemical affinity (ΔG r ) at 100°C can be fit reasonably well with the following expression: R ¼ 10 −7:64 a 1:05 H þ 10 −11:56 1−exp −0:01677 ΔGrThe rate law obtained in this study provides a basis for modeling chlorite mineral dissolution over a range of pH and saturation conditions, which is essential in applications such as subsurface CO 2 sequestration.

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Thermodynamic properties of chlorite CCa-2. Heat capacities, heat contents and entropies

Cited by 34 publications

References 37 publications

Thermodynamic properties of illite, smectite and beidellite by calorimetric methods: Enthalpies of formation, heat capacities, entropies and Gibbs free energies of formation

Thermodynamic properties of illite, smectite and beidellite by calorimetric methods: Enthalpies of formation, heat capacities, entropies and Gibbs free energies of formation

ThermoChimie database developments in the framework of cement/clay interactions

Chemical affinity and pH effects on chlorite dissolution kinetics under geological CO2 sequestration related conditions

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