Abstract
A hybrid photocatalyst was prepared from visible light-responsive Pt/WO3 and siliceous mordenite (MOR) zeolite by simple impregnation with an aqueous solution of (NH4)10W12O41·5H2O. Unmodified Pt/WO3 had low photocatalytic activity in gas phase oxidation of acetaldehyde because of its low surface area (3–5 m2/g). In contrast, the Pt/WO3–MOR had higher photocatalytic activity under focused sunlight and Xe lamp irradiation. Pt/WO3–MOR with low WO3 content (<20 wt%) adsorbed sufficient acetaldehyde, but absorption of light in the visible region was low. The optimum zeolite content enhancing the photocatalytic activity of Pt/WO3 was estimated to be 30–50 % (w/w). Adsorption of the gaseous reactants and the efficiency of absorption of incident light are both important aspects of high photocatalytic activity.
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