Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 270, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118846
Keywords
Methanation; Encapsulation of Ru nanoparticles; O-vacancy; Charge transfer; EMSI; SMSI; In situ DRIFTS; HAADF-STEM; XPS; EPR
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Aiming at a better understanding of the complex interactions between metal nanoparticles (NPs) and oxide supports, ranging from purely electronic metal-support interactions (EMSIs) to structural modifications associated with strong metal-support interactions (SMSIs), we investigated the impact of a temperature programmed reduction treatment (TPR) of a highly active Ru/TiO2 catalyst on its physical properties and its CO and CO2 methanation performance by kinetic and spectroscopic techniques, in combination with structural characterization. XP, EPR and DRIFT spectra resolved a significant shift of the Ru 3d levels to lower binding energies, the formation of O-vacancy defects and a red-shift of COad related bands, respectively, after the TPR sequence. This indicates an increase of the local charge density in the Ru NPs, due to charge transfer from O-vacancy defects to the Ru NPs. Finally, from CO adsorption and XPS measurements we conclude on a partial encapsulation of the Ru NPs by a TiOx layer.
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