Superfine CeO₂ embedded in a porous ZrO₂ matrix for catalytic HCL oxidation

Ce-Zr composite oxide catalysts were prepared by different methods for catalytic HCl oxidation. The nano-sized CeO₂ particles embedded in the amorphous ZrO₂ matrix fabricated by spontaneous deposition strategy. A significant "size effect" of CeO₂ nanoparticles leads to considerably high concentration of Ce³⁺ and oxygen vacancy sites, which makes the catalyst have excellent low-temperature oxidation reduction performance and oxygen storage capacity. Catalytic performance tests indicate that the CeO₂@ZrO₂ catalyst shows superior activity (1.90 gCl₂·gcat^-1·h^-1) and good durability. The isolation of CeO₂ nanoparticles by the amorphous ZrO₂ is a key factor of durability of the catalyst.