Gas engine tail gas all-pollutant purification catalyst and preparation method thereof

The invention relates to a gas engine tail gas all-pollutant purification catalyst and a preparation method thereof, and belongs to the technical field of gas engine tail gas purification catalysts. The catalyst comprises a carrier and an active component, the carrier is a zirconium-based porous material, the active component is a modified precursor of precious metal, the mass ratio of the carrier to the precious metal is 1:(0.001-0.03), and the preparation method comprises the following steps: dispersing a stock solution of the precious metal in deionized water to obtain a precious metal diluted solution with the concentration of 0.05%-12%; carrying out hydro-thermal treatment, centrifugation and re-dispersion to obtain a modified precursor of the noble metal; dispersing the carrier material in deionized water, adding the noble metal modified precursor, conducting stirring, adjusting the pH, and conducting drying, roasting, pulping and coating to obtain the catalyst. The carrier is made of a zirconium-based