Photolysis of Water over Pt/TiO<sub>2</sub> Catalysts

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  • Ｐｔ／ＴｉＯ２粉末触媒による水の光分解
  • Pt TiO2フンマツ ショクバイ ニ ヨル ミズ ノ ヒカリ ブンカイ

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Abstract

Quantum efficiency was measured for the photolysiA of gaseous water over NaOH-coated Pt; TiO2 catalysts and it was maximized by improving the method of platinization and selecting the crystal structure and the manufacturer of TiO2. The preparation methods of Pt/TiO2 catalysts were photo-electrochemical deposition, NaBH4 reduction, HCOONa reduction, and impregnation followed, by hydrogen reduction. It was found that the catalysts were activated by illuminating them in a wet state and then in a dry state in the presence of gaseous water. The stoichiometry of the products (H2/O2=2) was well established after the activation of the catalysts.<BR>The results show that the photocatalytic activity is little affected by the preparation method, but strongly depends on the crystal structure and the source of TiO2. Anatase is more active than rutile irrespective of its source. The activity of anatase seems to be affected by the impurity, the degree of crystal growth, and the grain size, while that of rutile seems to depend on the grain size alone. The maximum quantum efficiency, 17%, was attained when MCB anatase was used. It was also found that the rate of the thermal back reaction (H2+1/2O2→H2O) on Pt/TiO2 is proportional to the pressure of hydrogen and the net rate of water photolysis is independent of the pressures of the products within the pressure range observed.

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