TY - JOUR

T1 - Photocatalytic Reforming of Aqueous Acetic Acid into Molecular Hydrogen and Hydrocarbons over Co-catalyst-Loaded TiO2

T2 - Shifting the Product Distribution

AU - Hamid, Saher

AU - Dillert, Ralf

AU - Bahnemann, Detlef W.

N1 - © 2018 American Chemical Society

PY - 2018/6/21

Y1 - 2018/6/21

N2 - Acetic acid in aqueous suspensions of co-catalyst-loaded TiO 2 was photocatalytically converted into carbon dioxide, molecular hydrogen, methane, and ethane. The formed amounts of CO 2 were found to increase in the order Ag/TiO 2 < Au/TiO 2 < Rh/TiO 2 < RuO 2/TiO 2 < IrO 2/TiO 2 < Pt/TiO 2, thus indicating that the metal oxides employed here are suitable co-catalysts to promote the photocatalytic conversion of acetic acid. The same sequence of activities was found for methane evolution but not for the formation of H 2. The evolved amounts of these products as well as the amount distribution were found to be strongly affected by the initial concentration of the organic acid and by the co-catalyst. A large value of the work function of the employed co-catalyst seems to favor H 2 evolution. Gaseous mixtures rich in hydrocarbons are photocatalytically produced at sufficiently high initial concentrations of acetic acid employing a composite photocatalyst, where the co-catalyst has a low value of the work function, such as IrO 2 and Ag.

AB - Acetic acid in aqueous suspensions of co-catalyst-loaded TiO 2 was photocatalytically converted into carbon dioxide, molecular hydrogen, methane, and ethane. The formed amounts of CO 2 were found to increase in the order Ag/TiO 2 < Au/TiO 2 < Rh/TiO 2 < RuO 2/TiO 2 < IrO 2/TiO 2 < Pt/TiO 2, thus indicating that the metal oxides employed here are suitable co-catalysts to promote the photocatalytic conversion of acetic acid. The same sequence of activities was found for methane evolution but not for the formation of H 2. The evolved amounts of these products as well as the amount distribution were found to be strongly affected by the initial concentration of the organic acid and by the co-catalyst. A large value of the work function of the employed co-catalyst seems to favor H 2 evolution. Gaseous mixtures rich in hydrocarbons are photocatalytically produced at sufficiently high initial concentrations of acetic acid employing a composite photocatalyst, where the co-catalyst has a low value of the work function, such as IrO 2 and Ag.

UR - http://www.scopus.com/inward/record.url?scp=85047653822&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b02691

DO - 10.1021/acs.jpcc.8b02691

M3 - Article

VL - 122

SP - 12792

EP - 12809

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

SN - 1932-7455

IS - 24

ER -