NUEVOS CATALIZADORES DE Rh SOPORTADOS SOBRE La2O3-SiO2 PARA LA PRODUCCIÓN DE HIDRÓGENO EMPLEANDO UN REACTOR DE MEMBRANA.

JOHN MÚNERA, ALEJANDRO ROA, CARLOS CARRARA, SILVIA IRUSTA, EDUARDO LOMBARDO, LAURA CORNAGLIA

Santa Fe-Argentina

Congreso; XIV CONGRESO ARGENTINO DE CATÁLISIS; 2005

Universidad Nacional del Litoral

The membrane reactors employed for the dry reforming reaction were based on different membrane types. This reaction taken as a source of H2, was performed in the present work using a well-known catalyst, Rh/La2O3, together with a novel one, Rh/La2O3-SiO2, in a hydrogenpermeable membrane reactor. The catalysts were characterized by DRX, TPR, FTIR, LRS, H2 and CO chemisorption. The effect of the operation variables upon the performance of the membrana reactor was also studied. The novel Rh(0.6%)/La2O3(27%)-SiO2 catalyst proved to be the best formulation. Operating at 823 K, both methane and CO2 conversions were 40% higher than the equilibrium values, producing 0.5 mol H2/mol CH4. This catalyst, tested at W/F three times coger than the Rh(0.6%)/La2O3, showed a similar performance. In all cases, the activity of the Rh catalysts remained constant after 100 hours on stream at 823 K. The incorporation of the promoter (La2O3) to the silica support induced a parallel increase in the metal dispersion (CO adsorption) The concentration of surface Rh atoms slightly increased with lanthanum addition. The better performance of Rh(0.6%)/La2O3(27%)-SiO2 was related to the high dispersion and reaction rate of this formulation.