Influence of interaction between CeO2 and USY on the catalytic performance of CeO2–USY catalysts for deep oxidation of 1,2-dichloroethane

Three supported CeO2–USY catalysts were prepared by different CeO2 loading methods and evaluated for the deep oxidation of 1,2-dichloroethane (DCE). All the catalysts were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), ammonia temperature-programmed desorption (NH3-TPD), diffuse reflectance infrared spectra of pyridine adsorption (DRIFT), hydrogen temperature-programmed reduction (H2-TPR), oxygen storage capacity complete (OSCC) and X-ray photoelectron spectroscopy (XPS) techniques. The results show that a strong synergy effect occurs in the CeO2–USY catalysts prepared by impregnation method and mechanical grinding of USY and Ce(NO3)3·6H2O. Moreover, higher dispersion of CeO2 species, better mobility of oxygen species of the catalysts as well as better catalytic activity for DCE decomposition are obtained over these two catalysts. All the CeO2–USY catalysts show a high selectivity towards the formation of HCl. In addition, the CeO2–USY catalyst prepared by impregnation method maintains a high conversion in the 100 h test of DCE decomposition.

The figure presents the H2-TPR profiles of samples. It is noting that the strong interaction between CeO2 and USY in CeO2–USY-IM and CeO2–USY-M1 evidently improves the mobility of oxygen species.Figure optionsDownload high-quality image (102 K)Download as PowerPoint slide