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RESEARCH PRODUCT

Influence of Silver Deposits on the Photocatalytic Activity of Titania

subject

description

The objectives of depositing metals over semiconductor photocatalysts are to improve the electron-hole pair separation and to increase the rate of the reduction process due to the catalytic properties of the metal itself. Most of the deposited (noble) metals that have been studied belonged to group VIII. Very few studies concerned silver deposits. In the present work, the influence of deposited silver over anatase or rutile has been followed in three different types of reactions: (i) metal deposition, (ii) oxidation, and (iii) dehydrogenation. The final solids obtained in the last reaction (Pt/Ag/TiO{sub 2}) were also used as catalysts in two other test reactions to make comparison with TiO{sub 2} and Ag/TiO{sub 2}. The same reactant (2-propanol) was chosen because (i) it gives a good stoichiometry in dehydrogenation (H{sub 2}/acetone {approx} 1), and (ii) its photocatalytic oxidation has been selected as a test reaction to evaluate the photocatalytic inertness of TiO{sub 2}-based pigments. 17 refs., 1 fig.