Abstract
Ir and Pt have been tested as dopants for ruthenium sulfide supported on ordered SBA-15 mesoporous silica. The incorporation of Ir or Pt into RuS2/SBA-15 was found to enhance the activity in the gas-phase hydrodeoxygenation (HDO) of phenol carried out at 310 °C and 30 bar of total H2 pressure. X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy, temperature programmed desorption of NH3 and H2-temperature-programmed reduction of the sulfided catalysts were used to characterize the catalysts. XPS analysis of the spent catalysts confirmed the oxidation of ruthenium sulfide during HDO of phenol. The main factor that influences the catalyst activity was the surface exposure of the active phases, whereas the formation of oxysulfide species did not inhibit the HDO reaction.
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