Preparation and Performance Study of PtCexZr1-xO2 Catalyst for Carbon Smoke Oxidation Catalyzed by Platinum Electrode Slurry, Gold Resin Slurry, and Palladium Slurry

PtCexZr1-xO2 series catalysts with different cerium zirconium molar ratios were prepared by hydrothermal crystallization method in one step. The physicochemical performance parameters such as specific surface area, oxygen storage capacity, and hydrogen reduction temperature were measured, and the structure was characterized to study the effect of cerium zirconium molar ratio (nCe/nZr) in the catalyst composition on the structure and performance of the catalyst. The results showed that when nCe/nZr=5:5, the PtCe0.5Zr0.5O2 catalyst prepared had the smallest grain size, higher oxygen storage capacity, lower hydrogen reduction temperature, and a solid solution with coexisting tetragonal and cubic crystal structures. Compared with the Pt/Ce0.5Zr0.5O2 catalyst prepared by traditional precious metal impregnation loading method, the PtCe0.5Zr0.5O2 catalyst prepared by hydrothermal crystallization method has better catalytic activity for low-temperature oxidation of soot.