TIO2 – Catalysts dopped or impregnated with Pt on hydrogen production via water disociation using heterogeneous photocatalysis

Conference Dates

June 19-24, 2016


Alternative energies among them, hydrogen production via water dissociation using heterogeneous photocatalysis offers special promise [1]. Currently TiO2 is the most widely used photocatalyst. In the present study, experiments of hydrogen production via water splitting were developed using a Photo CREC Water II Reactor, with a specially adapted with H2 collector tank [2]. Ethanol 2 vol.% was employed as a renewable hole (h+) scavenger. TiO2 was doped with Pt using different loadings of Pt. The following methodologies were used: incipient impregnation, wetness impregnation and sol-gel. The prepared photo catalysts were characterized by BET, UV-Vis-diffuse reflectance, X-ray diffraction (XRD). The near UV lamp employed was characterized with a spectrophotoradiometer.

The semiconductor prepared with gol gel displayed the highest specific superficial area (125 54 m2/g) and a reduced band gap (2.7 eV versus the 3.2 eV for DP25). The quantum yield reactor efficiency (QY) for hydrogen production was calculated, using QY=[dNi/dt]/Pa x 100. In all the cases, at pH = 4, the hydrogen profiles were linear. and produced with a 1.7% Pt loading and a 17% QY. QYs were constant throughout the experiment, as a result of the zero order hydrogen formation.

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