Catalytic oxidation of trichloroethylene over TiO2 supported ruthenium catalysts

• The distribution characteristics of ruthenium species were thoroughly studied.
• The Ru/TiO2 catalysts show good activities for trichloroethylene oxidation.
• The effects of ruthenium migration from anatase to rutile were proposed.

Different types of TiO2 (anatase, P25 and rutile) supported ruthenium catalysts were synthesized by wet impregnation and directly reduced in H2. The distribution characteristics of ruthenium species were thoroughly studied before and after trichloroethylene oxidation. The results show that ruthenium oxide species are very unstable in the anatase phase, but quite stable in the rutile phase of TiO2. This phenomenon results in different catalytic behaviors for the Ru/TiO2 catalysts. The Ru/TiO2 (P25) catalyst has the best catalytic performance among these catalysts. The complete conversion temperature of trichloroethylene is in the temperature range of 260–270 °C.

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