Gazéification catalytique du Miscanthus X giganteus et vaporeformage d'un composé modèle : production de gaz de synthèse.

Abstract : This study presents the gasification of Miscanthus X giganteus (MXG). The MXG presents many advantage (high yield, perennial crop, easily harvesting?) so it?s a good candidate in terms of renewable energy sources. Several works have been carried out in the agricultural field, but this study is the first dealing with gasification in order to produce a syngas. The first part of this work concerns the study of gasification in fluidized bed reactor with olivine-based catalysts. The results obtained in different tests gave a good gas yield (CO + H2) comparable to others biomass. The catalyst characterisation by XRD and SEM is related to the properties of olivine (mechanical strength, recycling), while Ni-olivine gave much better results. Tar analysis by FTIR and GC/MS showed the presence of mainly PAH at high temperature (>800°C).The second part of this study deals with the steam reforming of methylnaphthalene which is representative of the tar composition issued from the MXG gasification. The steam reforming performed with the same catalysts as in the case of gasification. In addition to the main reaction, this study allowed us high lights the existence of secondary reaction such as the water gas shift reaction. Moreover these tests confirmed the high efficiency of Ni-olivine for tar removing. An overall mechanism was proposed with the important role of catalytic oxygen issued from water decomposition
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Rudy Michel. Gazéification catalytique du Miscanthus X giganteus et vaporeformage d'un composé modèle : production de gaz de synthèse.. Autre. Université Paul Verlaine - Metz, 2009. Français. ⟨NNT : 2009METZ044S⟩. ⟨tel-01752675⟩

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