Reaction Condition Effects on the Photocatalytic Production of H2 from Ethanol in the Gas Phase over Pt/TiO2

Abstract

The effects of reaction parameters on H (Formula presented.) production from ethanol photocatalysis in the gas phase have been investigated. The photocatalytic activity evolves from an early mass-transfer limited regime to an independent one at later irradiation times, which is interpreted in terms of a photocatalytic site activity distribution. Ethanol molar fraction exhibits two different domains, with H (Formula presented.) production increasing up to a molar fraction of 0.12, beyond which it plateaus. H (Formula presented.) :AcH ratios are very sensitive to reaction conditions, reaching 1.8 at low reactant flows. UV light is converted to H (Formula presented.) with an efficiency of nearly 3 %.