Adsorption of octamethylcyclotetrasiloxane (D4) on silica gel (SG): Retention mechanism

Abstract : Silica gel (SG) is an efficient adsorbent for the removal of octamethylcyclotetrasiloxane (D4) - a volatile organic silicon compound present in biogas. Complementary physicochemical characterizations of SG before and after D4 adsorption were performed: specific surface area, porosity, pH measurements, infrared spectroscopy, thermodesorption, thermogravimetry and differential scanning calorimetry. A retention mechanism, based on a combination of hydrogen bonding (at low uptake) and polymerization (at higher uptake) is proposed. This mechanism is able to explain the difficulties of siloxane thermal desorption.
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Léa Sigot, Gaëlle Ducom, Patrick Germain. Adsorption of octamethylcyclotetrasiloxane (D4) on silica gel (SG): Retention mechanism. Microporous and Mesoporous Materials, Elsevier, 2015, 213, pp.118 - 124. ⟨10.1016/j.micromeso.2015.04.016⟩. ⟨hal-01743285⟩



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