Abstract : Study of a treatment of siloxane by adsorption process into porous materials: treatment application to biogas Biogases have strong content of methane used in the production of heat or electricity. They contain more or less important quantities of siloxanes, which are forbidden for numerous uses of biogases. The possibility of siloxanes elimination by adsorption process is studied. The study in batch reactors allows us to evaluate the adsorption capacities of different materials as activated carbons cloths and grains, zeolites and silica gel. The influence on the treatment capacities of siloxanes under the presence of CH4, CO2, humidity, and other volatile organic compounds is studied. Good adsorption capacities for some adsorbents were found. For the most disadvantageous conditions of adsorption, a reduction of 20 % on the adsorption capacities has been found. The adsorption capacity remains modest. The influence of the operational conditions of the process is studied in order to improve the treatment capacities and to reduce the quantity of the adsorbent used. The results allowed us to define, validate and design a reduced scale system in the treatment of siloxanes. The process consists of an adsorption into activated carbon cloth, alternating with thermal regeneration by Joule effect. A pilot plant allowed us to accomplish and evaluate the aging of the process. All this work allows us to see the possibilities of industrial applications of the process, even if a trial stage on site in real conditions is still necessary.