Hydrogen production by the photo-reforming of methanol and the photocatalytic water gas shift reaction

Kennedy, Julia ORCID: https://orcid.org/0000-0003-4482-6392, Hayward, James, Davies, Philip ORCID: https://orcid.org/0000-0003-4394-766X and Bowker, Michael ORCID: https://orcid.org/0000-0001-5075-1089 2021. Hydrogen production by the photo-reforming of methanol and the photocatalytic water gas shift reaction. Journal of Physics: Energy 3 (2) , 024007. 10.1088/2515-7655/abdd82

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license.
Publisher:	IOP Publishing
ISSN:	2515-7655
Funders:	UK Catalysis Hub, funded through EPSRC grants EP/R026939/1 and EP/R026815/1, and from EPSRC EP/S030468/1, EP/N010531/1
Date of First Compliant Deposit:	21 January 2021
Date of Acceptance:	19 January 2021
Last Modified:	26 Jul 2024 17:27
URI:	https://orca.cardiff.ac.uk/id/eprint/137830

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