TY - JOUR
T1 - Hydrogen production via water dissociation using Pt–TiO2 photocatalysts
T2 - An oxidation–reduction network
AU - Guayaquil-Sosa, J. F.
AU - Calzada, Alan
AU - Serrano, Benito
AU - Escobedo, Salvador
AU - de Lasa, Hugo
N1 - Publisher Copyright:
© 2017 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2017/11
Y1 - 2017/11
N2 - Several TiO2 based semiconductors with different Pt loadings are prepared using incipient impregnation, wet impregnation and the sol-gel method. These photocatalysts are evaluated in the Photo-CREC-Water II Photoreactor for hydrogen production via water dissociation, using an organic renewable scavenger (ethanol). Results obtained show the influence of the photocatalyst preparation in the production of hydrogen and in the observed quantum yields. Furthermore, it is established that the reaction networks leading to hydrogen production, using various photocatalysts, share common features. This analysis is developed by both identifying and quantifying different chemical species and their changes with irradiation time. Key species in this oxidation–reduction network are hydrogen, hydrogen peroxide, ethanol, methane, ethane, acetaldehyde and carbon dioxide. On this basis, it is shown that under an inert gas atmosphere, ethanol consumption is sub-stoichiometric. This points towards simultaneous ethanol consumption and the formation of the ethanol scavenger.
AB - Several TiO2 based semiconductors with different Pt loadings are prepared using incipient impregnation, wet impregnation and the sol-gel method. These photocatalysts are evaluated in the Photo-CREC-Water II Photoreactor for hydrogen production via water dissociation, using an organic renewable scavenger (ethanol). Results obtained show the influence of the photocatalyst preparation in the production of hydrogen and in the observed quantum yields. Furthermore, it is established that the reaction networks leading to hydrogen production, using various photocatalysts, share common features. This analysis is developed by both identifying and quantifying different chemical species and their changes with irradiation time. Key species in this oxidation–reduction network are hydrogen, hydrogen peroxide, ethanol, methane, ethane, acetaldehyde and carbon dioxide. On this basis, it is shown that under an inert gas atmosphere, ethanol consumption is sub-stoichiometric. This points towards simultaneous ethanol consumption and the formation of the ethanol scavenger.
KW - Hydrogen
KW - Photocatalysis
KW - Platinum
KW - Titanium dioxide
KW - Water and electron scavenger
UR - http://www.scopus.com/inward/record.url?scp=85033549811&partnerID=8YFLogxK
U2 - 10.3390/catal7110324
DO - 10.3390/catal7110324
M3 - Artículo
AN - SCOPUS:85033549811
SN - 2073-4344
VL - 7
JO - Catalysts
JF - Catalysts
IS - 11
M1 - 324
ER -