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Hydrogen production by the photo-reforming of methanol and the photocatalytic water gas shift reaction
Authors:
Julia
Kennedy
(Cardiff University)
,
James
Hayward
(Cardiff University)
,
Philip
Davies
(Cardiff University)
,
Michael
Bowker
(University of Cardiff)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Physics: Energy
State:
Published (Approved)
Published:
January 2021

Abstract: We have examined the reforming of methanol and CO on Pd/P25 TiO2 catalysts for hydrogen production, and compared it with rates for similarly supported Au and Cu catalysts. Both reactions proceed, but the photocatalytic water gas shift reaction is much slower than for methanol reforming. CO2 is evolved as expected, but the yields can be much lower than for the expected stoichiometry (CH3OH + H2O CO2 + 3H2). We show that this is due to dissolution of the carbon dioxide into the aqueous phase. We have also carried out both reactions in the gas phase. Both proceed at a higher rate in the gas phase, and for methanol reforming, there is some CO evolution. In H2 + CO2 reactions, there is little sign of the reverse water gas shift reaction, but some photo-methanation does occur. Of the three catalysts Pd is the best for the methanol reforming reaction, while Au is best for the water gas shift. Nonetheless, Cu works reasonably well for methanol reforming and makes a much cheaper, earth-abundant catalyst.
Diamond Keywords: Photocatalysis
Subject Areas:
Chemistry,
Energy
Technical Areas:
Added On:
27/01/2021 23:06
Documents:
Kennedy+et+al_2021_J._Phys._Energy_10.1088_2515-7655_abdd82.pdf
Discipline Tags:
Energy Storage
Earth Sciences & Environment
Sustainable Energy Systems
Energy
Climate Change
Physical Chemistry
Catalysis
Chemistry
Technical Tags: