Gasoline car particle capturing catalyst and preparation method thereof

Abstract

The invention relates to a gasoline car particle capturing catalyst and a preparation method of the gasoline car particle capturing catalyst. The gasoline car particle capturing catalyst is characterized in that a first coating layer is coated on an inner framework arranged at the air inlet end of a carrier, a second coating layer is coated on an inner framework arranged at the air outlet end of the carrier, the height of the first coating layer and the height of the second coating layer are 50 to 100 percent of the height of the carrier, the coating amount of the first coating layer and the coating amount of the second coating layer are both 10 to 90 g / L, precious metal Rh is loaded in the first coating layer, the load amount of the precious metal Rh is 0.75 to 9.1 g / ft<3>, precious metal Pd and precious metal Rh are loaded in the second coating layer, the load amount of the precious metal Rh is 0.09 to 2.5 g / ft<3>, and the load amount of the precious metal Pd is 5 to 50 g / ft<3>. The preparation method disclosed by the invention is simple, the prepared gasoline car particle capturing catalyst is capable of well reducing the PN (Particle Number), and a single Rh coating layer is arranged at the air inlet end, so that the generation of palladium-rhodium alloy is avoided; meanwhile, less precious metal Rh is introduced into a Pd coating layer arranged at the air outlet end, so that the oxygen storage ability of the coating layer can be increased; meanwhile, high activity and high temperature aging resistance of the gasoline car particle capturing catalyst are also ensured, and the nitric oxide (NOx) treatment ability of the gasoline car particle capturing catalyst is increased.

Description

technical field [0001] The invention relates to a gasoline vehicle particle trapping catalyst and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Relevant data show that motor vehicle exhaust accounts for 22.2% of Beijing smog particles, and motor vehicle exhaust is the most important component of smog particles. The pollutants in automobile exhaust are mainly composed of carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC) and particulate matter, among which the particulate matter emitted by motor vehicles is one of the main culprits of PM2.5, which are harmful to the environment It poses a great threat to human health. Installing a particle trapping catalyst near the three-way catalyst of the car can effectively convert carbon monoxide (CO), nitrogen oxides (NOx), and hydrocarbons (HC) into harmful components. Carbon dioxide (CO2), nitrogen (N2), water (H2O) and reduced particle number (PN). ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of incomplete treatment of existing catalysts with the increase of particulate pollutants in automobile exhaust, and to provide a particle trapping catalyst for gasoline vehicles and a preparation method thereof. The preparation method is simple, and the prepared catalyst has high Excellent catalytic activity, high temperature aging resistance and ability to deal with nitrogen oxides (NOx)

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