Synthesis, characterization, and application of ruthenium-doped SrTiO3 perovskite catalysts for microwave-assisted methane dry reforming

Lalit S. Gangurde, Guido S.J. Sturm, M. J. Valero-Romero, Reyes Mallada, Jesus Santamaria, Andrzej I. Stankiewicz, Georgios D. Stefanidis

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22 Citations (Scopus)
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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.

Original languageEnglish
Pages (from-to)178-190
JournalChemical Engineering and Processing - Process Intensification
Volume127
DOIs
Publication statusPublished - 2018

Keywords

  • Dielectric properties measurements
  • Methane dry reforming
  • Microwaves
  • Perovskite catalysts

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