4.6 Article

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

期刊

JOURNAL OF PHYSICS-ENERGY
卷 3, 期 2, 页码 -

出版社

IOP PUBLISHING LTD
DOI: 10.1088/2515-7655/abdd82

关键词

photocatalysis; methanol; water splitting; titania; reforming; water gas shift

资金

  1. UK Catalysis Hub
  2. EPSRC [EP/R026939/1, EP/R026815/1, EP/S030468/1, EP/N010531/1]
  3. EPSRC [EP/N010531/1, EP/R026939/1, EP/S030468/1, EP/R026815/1] Funding Source: UKRI

向作者/读者索取更多资源

The study investigated the reforming of methanol and CO on Pd/P25 TiO2 catalysts for hydrogen production and compared their rates with similarly supported Au and Cu catalysts. It found that methanol reforming proceeds at a faster rate than the water-gas shift reaction, while CO2 yields can sometimes be lower than expected. Additionally, the study showed that dissolution of carbon dioxide into the aqueous phase played a role in the observed lower yields.
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 (WGS) 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 + 3H(2)). 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 H-2 + CO2 reactions, there is little sign of the reverse WGS 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.

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