An in-situ DRIFTS-MS study of the photocatalytic H_2 production from ethanol_((aq)) vapour over Pt/TiO_2 and Pt-Ga/TiO_2 catalysts

摘要

In this paper, Pt/TiO2and PtGa/TiO2catalysts with similar Pt dispersion and similar structural and morphological characteristics were compared in the H2production from the phototransformation of aqueous solutions of ethanol. Catalysts were characterized by means of N2adsorption-desorption, XRD, Raman, H2-TPR, UV–Vis diffuse reflectance spectroscopy, XPS and CO chemisorption. The photocatalytic reaction was carried out in liquid and vapour phase. The photocatalytic transformation of ethanol(aq)vapour over Pt/TiO2and PtGa/TiO2catalysts was studied by in situ DRIFTS-MS. Differences in the photocatalytic transformation of ethanol(aq)over Pt/TiO2and PtGa/TiO2were determined. The effect of Ga is analysed in the light of the evolution of surface species under photocatalytic reaction conditions.