Effects of support property on the catalytic performance of CeO2-ZrO2-CrOx for 1,2-dichloroethane oxidation

HZSM-5, Al2O3, TiO2 and SiO2 supported CeO2-ZrO2-CrOx catalysts were prepared by deposition-precipitation method and tested for deep catalytic oxidation of 1,2-dichloroethane (DCE), as one of the common chlorinated organic pollutants. All the catalysts were characterized by means of N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), ammonia-temperature-programmed desorption (NH3-TPD) and hydrogen temperature-programmed reduction (H2-TPR). The characterization results revealed that there was strongly synergistic effect between the oxidizability of CZCr species and the acidity of supports, which obviously promoted the catalytic activity for DCE degradation. 20%CZCr/HZSM-5 showed the highest activity and good durability during the long-term continuous test. The catalytic activity decreased in the order: 20%CZCr/HZSM-5>CZCr>20%CZCr/TiO2>20%CZCr/Al2O3>20%CZCr/SiO2.

Graphical AbstractCatalytic performance for DCE degradation over fresh catalysts (a) Conversion curve of DCE; (b) Concentration of byproduct C2H3Cl; (c) Conversion curves of DCE over the various supportsFigure optionsDownload as PowerPoint slide