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- Resumen es exacto "The main objective of this research is to study the steam reforming of glycerol to produce hydrogen. To this end, the preparation of supported catalysts Ni-Mg-Al is optimized. Additionally, the effect of process variables on glycerol conversion and yields to gaseous products are analysed.
In order, to contextualize this research and to explain why it necessary to add value to glycerol, a synthesis regarding biofuels status including biodiesel is performed. Furthermore, the concept of biorefineries is considered. A detailed analysis of the published bibliography as regards the steam reforming of glycerol is done; mainly considering the catalysts employed (active phase and support) and the reaction conditions. Moreover, various studies related to the catalytic system Ni-Mg-Al are taken into account.
Results from the thermodynamic analysis of the steam reforming of glycerol, obtained by the stoichiometric method, are presented. The aim is to identify the reactions conditions in order to maximize hydrogen production while carbon formation is minimized.
In the experimental section, the different characterization technique employed to study catalysts are described. Also, a description of both the equipment used for catalyst evaluation and the chromatographic technique are included. The different parameters considered for catalytic evaluation are considered.
As regards to the optimization of the preparation of Ni-Mg-Al catalysts, a large study is performed; considering the following variables: the calcination temperature of the support and of the catalysts, Mg(II) and Ni(II) contents. An attempt to correlate the textural and structural characteristics of the solids with the catalytic performance is done.
The effect on the catalytic activity of the variables of the process (reaction temperature, contact time and feed composition), for both catalysts, are analysed. Based on these studies, it is feasible to propose a reaction scheme for the steam reforming over both catalysts. As well, the effect of reactants ratio in the feed is considered, in order to propose a kinetic behaviour.
Finally, the activity results for both catalysts obtained under the same reaction conditions are compared and correlated with the corresponding characterization results. In addition, stability test and coke formation studies for both catalysts are considered."
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