Formal Kinetic Description of Photocatalytic Hydrogen Evolution from Ethanol Aqueous Solutions in the Presence of Sodium Hydroxide

Abstract

The dependences of the rate of the photocatalytic hydrogen production in ethanol aqueous solutions on the concentration of ethanol and sodium hydroxide on the 1% Pt/10% Ni(OH)₂/Cd_0.3Zn_0.7S photocatalyst under visible light irradiation (λ = 450 nm) are studied. To describe kinetic data, the Langmuir–Hinshelwood equation was modified. An equation was proposed that reflects the dependence of the reaction rate on the concentration of NaOH, and an equation was derived for the first time that shows the dependence of the rate of photocatalytic hydrogen production from the concentrations of both reactants, ethanol and sodium hydroxide. The validity of the proposed equations was confirmed by their use for the description of the experimental data obtained in this work and reported earlier.