Effects of SiO2-doping on high-surface-area Ru/TiO2 catalysts for the selective CO methanation

Sebastian Cisneros, Shilong Chen, Thomas Diemant, Joachim Bansmann, Ali M. Abdel-Mageed*, Michael Goepel, Sine E. Olesen, Eike S. Welter, Magdalena Parlinska-Wojtan, Roger Gläser, Ib Chorkendorff, R. Jürgen Behm*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Aiming at a better understanding of the role of electronic / chemical modifications of the support on the performance of high specific surface area Ru/TiO2 catalysts in the selective CO methanation, we prepared and examined four different Ru/TiO2 catalysts with similar Ru loading and similar high specific surface area, but with the support doped with different amounts of Si (0–12 wt.% SiO2). Their activity for methane formation exhibits a volcano-shaped dependence on the SiO2 content, with a maximum between 4 and 8 wt.%. The CO adsorption properties showed distinct differences, with the weakest CO adsorption strength for the most active catalysts. Based on the results of a variety of different characterization techniques and pyrrole/pyridine adsorption measurements, the higher activity / lower CO adsorption strength cannot be explained by a single property, such as particle size, but must rather be caused by a complex combination of different effects.
Original languageEnglish
Article number119483
JournalApplied Catalysis B: Environmental
Volume282
Number of pages11
ISSN0926-3373
DOIs
Publication statusPublished - 2021

Keywords

  • Selective CO methanation
  • Si-doping
  • Ru catalyst
  • DRIFTS
  • UV–Vis spectroscopy

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