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Issue 6, 2016
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Continuous flow gas phase photoreforming of methanol at elevated reaction temperatures sensitised by Pt/TiO2

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Abstract

Gas phase photoreforming of methanol using a Pt/TiO2 photocatalyst has been performed under flow conditions at elevated temperatures. Comparing the activity of the reforming process as a function of temperature under dark and irradiated conditions shows a significant enhancement in the rate of H2 production using the photo-assisted conditions at temperatures between 100–140 °C. At higher temperatures, the effect of irradiation is small with the process dominated by the thermal process. Deactivation of the catalyst was observed under irradiation but the catalyst was easily regenerated using an oxygen treatment at 120 °C. Diffuse reflectance infra-red Fourier transform spectroscopy (DRIFTS) showed that the activity of the catalyst could be correlated with the presence of the photogenerated trapped electrons. In addition, lower amounts of CO adsorbed on Pt, compared to those observed in the dark reaction, were found for the UV-irradiated systems. It is proposed that CO and adsorbed intermediates, such as formate, can act as inhibitors in the photoreforming process and this is further supported by the observation that, before and after the regeneration process in O2, the CO and surface adsorbed organic intermediate products are removed and the activity is recovered.

Graphical abstract: Continuous flow gas phase photoreforming of methanol at elevated reaction temperatures sensitised by Pt/TiO2

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Publication details

The article was received on 27 Jul 2016, accepted on 30 Sep 2016 and first published on 11 Oct 2016


Article type: Paper
DOI: 10.1039/C6RE00140H
Citation: React. Chem. Eng., 2016,1, 649-657
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    Continuous flow gas phase photoreforming of methanol at elevated reaction temperatures sensitised by Pt/TiO2

    A. Caravaca, H. Daly, M. Smith, A. Mills, S. Chansai and C. Hardacre, React. Chem. Eng., 2016, 1, 649
    DOI: 10.1039/C6RE00140H

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