Stability of functionalized activated carbon in hot liquid water

Acidity and stability of activated carbon-based solid acid catalysts for aqueous-phase reactions are investigated

Adam H. Van Pelt; Olga A. Simakova; Sarah M. Schimming; Jessica L. Ewbank; Guo Shiou Foo; Evgeny A. Pidko; Emiel J.M. Hensen; Carsten Sievers

2014

Scholarcy highlights

  • Acidity and stability of activated carbon-based solid acid catalysts for aqueous-phase reactions are investigated
  • Carbon is acidified with liquid and gas phase methods, using nitric and sulfuric acid, hydrogen peroxide and calcination in air at 300 and 400 °C
  • Modified carbons are characterized by nitrogen physisorption, scanning electron microscopy, point of zero charge measurements, Boehm titration, temperature-programmed desorption–mass spectrometry, and X-ray photoelectron spectroscopy
  • Stability of acid functional groups under typical reaction conditions for biomass conversion is investigated by exposing carbons to hydrothermal treatment
  • Strong acid sites formed by sulfuric acid treatment show a much higher stability than those formed by the other acidification procedures
  • Such strong acid sites remain on the carbon surface after exposure to hot liquid water at 225 °C

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