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Methanol photo-reforming with water on pure titania for hydrogen production

Bowker, M. and Jones, W. 2020. Methanol photo-reforming with water on pure titania for hydrogen production. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences 378 (2176) , 20200058. 10.1098/rsta.2020.0058

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Abstract

The behavior of titania for the photo-reforming of methanol with water at ambient temperature has been examined. It is shown that the reactivity is very poor, compared with metal-loaded catalysts at low methanol levels in solution, but the rate becomes much higher at high methanol levels, such that the difference from metal-loaded samples is much less. The optimum yield is with approximately a 1:1 methanol/water solution. The reaction also proceeds well in the gas phase. During all such catalysis the titania becomes blue, due to light absorption increasing across the range 400-800 nm. However, this does not result in visible range activity for the photo-reforming and is due to the reduction of the material in the presence of light and the formation of anion vacancies and Ti3+ centres. These anion vacancies are only very slowly re-oxidised in air on P25 titania, taking days to recover the original whiteness of the oxide. The performance of anatase, rutile and the mixed phase are compared.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Royal Society, The
ISSN: 1364-503X
Date of First Compliant Deposit: 24 June 2020
Date of Acceptance: 15 April 2020
Last Modified: 31 Aug 2020 16:31
URI: http://orca.cf.ac.uk/id/eprint/132766

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