Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

In this study, CH4 dry reforming was demonstrated on a novel microwave-synthesized ruthenium (Ru)/carbon nanotube (CNT) catalyst. The catalyst was tested in an isothermal laboratory-packed bed reactor, with gas analysis by gas chromatography/thermal conductivity detection. The catalyst demonstrated excellent dry-reforming activity at modest temperatures (773-973 K) and pressure (3.03 x 10(5) Pa). Higher reaction temperatures favored increased conversion of CH4 and CO2, and increased H-2/CO product ratios. Slight coke deposition, estimated by carbon balance, was observed at higher temperatures and higher feed CH4/CO2. A robust global kinetic model composed of three reversible reactions-dry reforming, reverse water gas shift, and CH4 decomposition-simulates observed outlet species concentrations and reactant conversions using this Ru/CNT catalyst over the temperature range of this study. This engineering kinetic model for the Ru/CNT catalyst predicts a somewhat higher selectivity and yield for H-2, and less for CO, in comparison to previously published results for a similarly prepared Pt_Pd/CNT catalyst from our group.