Well-dispersed Rh nanoparticles with high activity for the dry reforming of methane

• Published in: International journal of hydrogen energy 2017-06, Vol.42 (25), p.16127-16138
• Main Authors: Faroldi, Betina, Múnera, John, Falivene, Juan Manuel, Ramos, Inmaculada Rodríguez, García, Álvaro Gutiérrez, Fernández, Loreto Tejedor, Carrazán, Silvia González, Cornaglia, Laura
• Format: Article
• Language: English
• Subjects: Dry reforming; Membrane reactor; Pure hydrogen; Rh nanoparticles; SiO2 binary supports
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2017.04.070

Rh catalysts with low Rh content were prepared by incipient wetness impregnation using [NH4]3[RhCl6]·3H2O or RhCl3·3H2O as precursor salts, on CaO–SiO2 supports. All solids showed a high stability after 48 h on stream for the dry reforming of methane with low carbon content, which made them suitable for obtaining ultrapure hydrogen in a membrane reactor. The methane conversion and hydrogen recovery were measured increasing the sweep gas flow rates to rise the driving force for hydrogen permeation. The catalyst with 0.36 wt.% of Rh showed a slight deactivation. However, the Rh(0.6)/CaO–SiO2 solid, in which the Rh impregnation was performed using [NH4]3[RhCl6]·3H2O, exhibited an increase on CH4 conversion of 77% and a hydrogen recovery equal to 84%. Nanoparticles of about 1.4–1.7 nm surface average diameter were detected for the reduced and used solids indicating that Rh is well dispersed and sintering was not produced after the catalytic tests. Rh particle sizes calculated by CO chemisorption were coincident with those measured by Transmission Electron Microscopy. Characterization by this technique and Laser Raman Spectroscopy of the solids used in membrane reactor revealed the formation of scarce carbon filaments. However, a surface re-oxidation was detected in the low loading catalyst used in the membrane reactor suggesting that it is the main cause for the decrease in the activity of the highly dispersed catalyst. •Rh nanoparticles of about 1.4–1.7 nm were well dispersed on the CaO–SiO2 surface.•All the stable catalysts were applied in a membrane reactor for dry reforming of CH4.•The catalyst with 0.36 wt.% of Rh showed a slight deactivation.•No agglomeration of the Rh nanoparticles were observed by Transmission Electron Microscopy.•The main cause for the decrease in the activity was the oxidation of small Rh nanoparticles.