Production d'hydrogène par reformage de l'éthanol sur catalyseurs à base d'iridium et rhodium supportés sur cérine

The main objective of the thesis was to investigate the catalytic performance of stable, active and selective catalytic systems for ethanol steam reforming, ethanol partial oxidation and the combined auto-thermal reforming of ethanol. Two main formulations Ir/CeO2 and Rh/CeO2 were selected to i) investigate surface reaction of adsorbed ethanol via FT-IR and TPD techniques to investigate reaction mechanism; ii) check the ethanol reforming reaction in fixed-bed and micro-structured reactor. Ceria support was found to prevent the highly dispersed active metal particles from sintering and to inhibit coke formation through strong metal-support interactions and redox property. In addition, ceria dispersion was shown to monitor the extent of ethanol conversion and therefore the aging properties of the catalytic systems. It was also possible to identify key elementary steps in reaction mechanism, revealing intermediate products, characteristic of transient, low temperature and short contact time regimes. For the three reactions, excellent performances were obtained with the micro-structured reactor, essentially due to a better heat management, offering real perspectives for an industrial developmentLYON1-BU.Sciences (692662101) / SudocSudocFranceF