Aprovechamiento de CO2 para la producción de gas natural sintético (GNS) mediante metanación con H2 renovable

Résumé

The impact of human activity on the Earth and related anthropogenic CO2 emissions have significantly elevated GHG concentration in atmosphere leading to global warming of around 1.5°C since preindustrial period, which is nowadays reflected as notorious climate change. Accordingly, strategic policies for decarbonizing the energetic system are being applied such as Power-to-Gas (Gas: CH4), which is gaining interest to reduce CO2 emissions while generating Synthetic Natural Gas (SNG). This technology requires an active, selective and stable catalyst to carry out CO2 methanation using renewable H2 at mild industrial conditions.In this thesis, alumina- and zeolite-supported Ni and Ru catalysts have been synthesized and optimized for efficient CO2 methanation. Reaction kinetics on Ni/Al2O3 are studied and satisfactorily described by akinetic model with high statistical significance, including the role of formates and carbonyls as reaction intermediates. Substantial insights into the reaction mechanism on Ni/Na-BETA and Ni-La2O3/Na-BETA catalysts are reported, identifying the type of adsorbed species on different surface sites (BETA zeolite, exchanged Na+, impregnated La2O3 and Ni).