A gas-phase reactor powered by solar energy and ethanol for H2 production

In the view of H-2 as the future energy vector, we presented here the development of a homemade photoreactor working in gas phase and easily interfacing with fuel cell devices, for H-2 production by ethanol dehydrogenation. The process generates acetaldehyde as the main co-product, which is more economically advantageous with respect to the low valuable CO2 produced in the alternative pathway of ethanol photoreforming. The materials adopted as photocatalysts are based on TiO2 substrates but properly modified with noble (Au) and not-noble (Cu) metals to enhance light harvesting in the visible region. The samples were characterized by BET surface area analysis, Transmission Electron Microscopy (TEM) and UV-visible Diffusive Reflectance Spectroscopy, and finally tested in our homemade photo-reactor by simulated solar irradiation. We discussed about the benefits of operating in gas phase with respect to a conventional slurry photo-reactor (minimization of scattering phenomena, no metal leaching, easy product recovery, etc.). Results showed that high H-2 productivity can be obtained in gas phase conditions, also irradiating titania photocatalysts doped with not-noble metals. (C) 2014 Elsevier Ltd. All rights reserved.