Catalytic Oxidation of Trichloroethylene over RuO2 Supported on Ceria-zirconia Mixed Oxide

Ru/Ce-Zr catalysts were prepared by impregnation of Ru on the hydrothermally synthesized Ce-Zr mixed oxide with different molar ratio of Ce/Zr. The resultant products were systematically characterized by inductively coupled plasma(ICP), X-ray diffraction(XRD), scanning electron microscopy(SEM)/energy dispersive spectrometry(EDS), H-2-temperature programmed reduction(H-2-TPR), NH3-temperature programmed desorption(NH3-TPD) and X-ray photoelectron spectroscopy(XPS). It was proved by H-2-TPR and NH3-TPD that the introduction of Ru can improve the activity of oxygen of catalysts and the presence of Zr contributes to the increments of acid properties of catalysts. When the molar ratio of Ce-Zr was 8: 4, the quantity of Ru was 0.9%(mass ratio), and the calcined temperature of catalysts was at 400 degrees C, the removal rate of 90% for trichloroethylene(TCE) was reached at 250 degrees C for 5360 mg/m(3) TCE and the stability of the catalysts was investigated under the condition. The results showed that the high removal rate can be maintained for at least 90 h, which is promising for industrial application.