Diesel vehicle particle complementing catalyst and preparation method thereof

The invention relates to a diesel vehicle particle complementing catalyst and a preparation method thereof, and belongs to the technical field of the motor vehicle exhaust post-treatment. The diesel vehicle particle complementing catalyst comprises a carrier. The carrier is aluminum titanate, silicon carbide or cordierite materials, and is a whole carrier with an asymmetric wall flow-type honeycomb structure. The carrier is coated with a coating material of catalyzed carbon oxide particles and volatile organic compounds, wherein a coating quantity of the coating material is 1-50 g/L. In the coating material, cerium oxide and aluminum oxide are used as a load matrix of precious metals Pt and Pd, alkali metals (potassium, sodium, lithium and the like) are used as chemical and structure additives. The diesel vehicle particle complementing catalyst prepared by using the preparation method has a lower carbon particle oxidation balance point temperature. Because of the presence of the alkalimetals, a contact rate o