Promotion Mechanisms of Au Supported on TiO2 in Thermal- And Photocatalytic Glycerol Conversion

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

DOI

  • Yanbin Shen, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Soochow University, Synfuels China Co., Ltd.
  • ,
  • Aref Mamakhel
  • Xi Liu, Synfuels China Co., Ltd.
  • ,
  • Thomas W. Hansen, Technical University of Denmark (DTU)
  • ,
  • Tommaso Tabanelli, Università di Bologna
  • ,
  • Danilo Bonincontro, Università di Bologna
  • ,
  • Bo B. Iversen
  • Laura Prati, University of Milan
  • ,
  • Yongwang Li, Synfuels China Co., Ltd.
  • ,
  • J. W.Hans Niemantsverdriet, Synfuels China Co., Ltd., Syngaschem BV
  • ,
  • Graham Hutchings, Cardiff University, The UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory
  • ,
  • Nikolaos Dimitratos, Università di Bologna, The UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Cardiff University
  • ,
  • Alberto Villa, University of Milan, The UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory
  • ,
  • Ren Su

Catalytic glycerol conversion by means of either photon or thermal energy is of great importance and can be realized by metal supported on TiO2 systems. Although various procedures have been employed to synthesize efficient metal/TiO2 catalysts, the promotional mechanisms for both reactions are still unclear due to the lack of well-defined systems. Here, we have deposited gold nanoparticles on a series of highly crystalline anatase TiO2 substrates with different crystallite sizes (7, 12, 16, 28 nm) by both direct precipitation and sol-immobilization methods to examine the effect of metal deposition methods and TiO2 sizes on both photo- and thermal catalytic glycerol reforming. For photocatalytic H2 evolution from glycerol, optimum performance was observed for the Au supported on 12 nm TiO2 for both deposition methods. For thermal catalytic glycerol oxidation, all catalysts show a similar selectivity to glycerate (>70%) regardless of the TiO2 size and metal deposition method; however, the metal deposition method significantly influences the catalytic activity. In situ UV-vis spectrometry reveals that the optimized photocatalytic performance originates from enhanced charge transfer kinetics and a more negative Fermi level for proton reduction, whereas electrochemical analysis reveals that the promoted glycerol oxidation is caused by the enhanced oxygen reduction half-reaction.

OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry C
Vol/bind123
Nummer32
Sider (fra-til)19734-19741
Antal sider8
ISSN1932-7447
DOI
StatusUdgivet - 2019

Se relationer på Aarhus Universitet Citationsformater

ID: 167041831