role of the surface chemistry of activated carbons in the adsorption of siloxanes for biogas purification
Résumé
Taking into account the continuous increase concern over greenhouse gases, such as methane and carbon dioxide, the biogas mixture produced in landfills or waste water treatment plants can be collected and utilized as a fuel for producing energy. However, the use of biogas as an energy source sets various design requirements for gas quality and gas cleaning systems [1].
A special issue regarding biogas concerns the presence of traces siloxanes, semi-volatile
methylated organosilicon compounds containing Si–O bonds. Originating from hygiene,
health care and industrial products, siloxanes are converted during biogas combustion process into crystalline silica inducing the engine damage [2].
This study aims to investigate the adsorption of siloxane compounds over different activated
carbon (AC) solids. The objectives are to test octamethylcyclotetrasiloxane (D4) adsorption
capacity of the ACs from different sources under dry/humid atmosphere, deeply characterize
the solids and then search the dependence between the D4 adsorption capacity and the AC
surface chemistry and textural characteristics.