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Article Dans Une Revue Bioresource Technology Année : 2014

Kinetics of the hydrothermal treatment of tannin for producing carbonaceous microspheres

Résumé

Aqueous solutions of condensed tannins were submitted to hydrothermal carbonization (HTC) in a stainless steel autoclave, and the kinetics of hydrothermal carbon formation was investigated by changing several parameters: amount of tannin (0.5; 1.0; 1.5; 2.0 g in 16 mL of water), HTC temperature (130, 160, 180 and 200 degrees C) and reaction times (from 1 to 720 h). The morphology and the structure of the tannin-based hydrothermal carbons were studied by TEM, krypton adsorption at - 196 degrees C and helium pycnometry. These materials presented agglomerated spherical particles, having surface areas ranging from 0.6 to 10.0 m(2) g(-1). The chemical composition of the hydrothermal carbons was found to be constant and independent of reaction time. HTC kinetics of tannin were determined and shown to correspond to first-order reaction. Temperature-dependent measurements led to an activation energy of 91 kJ mol(-1) for hydrothermal conversion of tannin into carbonaceous microspheres separable by centrifugation.
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Dates et versions

hal-01295577 , version 1 (31-03-2016)

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F. L. Braghiroli, Vanessa Fierro, M. T. Izquierdo, J. Parmentier, Antonio Pizzi, et al.. Kinetics of the hydrothermal treatment of tannin for producing carbonaceous microspheres. Bioresource Technology, 2014, 151, pp.271-277. ⟨10.1016/j.biortech.2013.10.045⟩. ⟨hal-01295577⟩
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