Synthesis, characterization, and application of ruthenium-doped SrTiO3 perovskite catalysts for microwave-assisted methane dry reforming
L.S. Gangurde (TU Delft - Intensified Reaction and Separation Systems)
G. S.J. Sturm (TU Delft - Intensified Reaction and Separation Systems)
Maria Jose Valero-Romero (TU Delft - ChemE/Catalysis Engineering)
Reyes Mallada (Environmental Technology C/ Mariano Esquillor)
Jesus Santamaría (Environmental Technology C/ Mariano Esquillor)
AI Stankiewicz (TU Delft - Intensified Reaction and Separation Systems)
Georgios Stefanidis (Katholieke Universiteit Leuven, TU Delft - Intensified Reaction and Separation Systems)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
A series of ruthenium-doped strontium titanate (SrTiO3) perovskite catalysts were synthesized by conventional and microwave-assisted hydrothermal methods. The structure was analyzed by X-Ray diffraction (XRD) confirming the formation of the perovskite phase with some TiO2 anatase phase in all the catalysts. Microwave irradiation decreases the temperature and time of synthesis from 220 °C for 24 h (conventional heating) to 180 °C for 1h, without affecting the formation of perovskite. A 7 wt. % ruthenium-doped SrTiO3 catalyst showed the best dielectric properties, and thus its catalytic activity was evaluated for the methane dry reforming reaction under microwave heating in a custom fixed-bed quartz reactor. Microwave power, CH4:CO2 vol. % feed ratio and gas hourly space velocity (GHSV) were varied in order to determine the best conditions for performing dry reforming with high reactants conversions and H2/CO ratio. Stable maximum CH4 and CO2 conversions of ∼99.5% and ∼94%, respectively, at H2/CO ∼0.9 were possible to reach with the 7 wt. % ruthenium-doped SrTiO3 catalyst exposed to maximum temperatures in the vicinity of 940 °C. A comparative theoretical scale-up study shows significant improvement in H2 production capability in the case of the perovskite catalyst compared to carbon-based catalysts.