ZrO2/CeO2 (xZr/Ce) and CeO2/ZrO2 (yCe/Zr) catalysts with different loading were prepared by wet impregnation method. XRD

Raman

N2-Sorption

TEM and H2-TPR were used to study the interaction between CeO2 and ZrO2 in the recycling of Cl2 from HCl oxidation. The results showed that the doping appropriate amount of zirconium species on the surface of CeO2 could increase the concentration of oxygen vacancy over xZr/Ce

which was in favor of enhancing the activity of HCl oxidation. When there were too many Zr4+ doping on the surface of CeO2

a part of Zr elements would be presented as ZrO2 over the surface of xZr/Ce and the oxygen vacancy was covered

which was unfavorable to the activity of HCl oxidation. For yCe/Zr catalyst

the dispersive CeO2 over ZrO2 was beneficial to the improvement of the catalytic activity

but the increase of catalytic activity would slow down when the loading of CeO2 exceed 10%. By comparing xZr/Ce with yCe/Zr catalysts

the oxygen vacancy of xZr/Ce was mainly formed by Ce-Zr solid solution

while the oxygen vacancy of yCe/Zr was formed by highly dispersive CeO2. It was found that the oxygen vacancy produced by different structure have different effects on the activity. The oxygen vacancies produced by Ce-Zr solid solution are more favorable to the activity enhancement. The ability of chlorine resistance of xZr/Ce and yCe/Zr catalysts behaved a superior stability in the long-term test compared to pure CeO2.