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Catalytic hydrothermal gasification of model compounds of biomasses and wastes

Technological challenge: Green and decarbonated energy incl. bioprocesses and waste valorization (learn more)

Department: Département Thermique Conversion et Hydrogène (LITEN)

Laboratory: Laboratoire réacteurs et procédés

Start Date: 01-10-2022

Location: Grenoble

CEA Code: SL-DRT-22-0668

Contact: hary.demeycedeno@cea.fr

Hydrogen and methane production from biomasses and wastes is a hot topic that has attracted great interest in the energy transition in the recent years. Hydrothermal gasification (HTG) is a thermochemical process which employs the supercritical conditions of water (T > 374 ° C, P > 221 bar), in order to convert the organic carbon contained in the wet feedstock into a gaseous phase (which contains CH4, H2, CO and CO2, mainly). Hydrothermal gasification is an endothermic process, in which the higher conversion yields are usually obtained at high operating conditions of temperature and pressure (around 600 ° C and 300 bar). Thus, the utilization of catalyst-materials has been studied recently, to improve the efficiency of carbon conversion into gas at moderate temperatures (400 ° C-500 ° C) and also to increase the selectivity of species towards a gas richer in methane or in hydrogen. However, the reaction pathways are poorly studied in the literature, which represent the key for understanding the biomass conversion at supercritical conditions. The thesis aims to study the reaction mechanisms of model-molecules of biomasses at supercritical conditions. The study will lead to the formulation and optimization of catalysts-materials to improve the conversion yields. The focus of this PhD work will involve: i) the formulation of new catalysts (metal/support); ii) the stability of the catalysts in the supercritical medium (activation/deactivation); iii) the selectivity of the catalysts towards a gas richer in hydrogen or methane.

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