Cerium-zirconium compound oxide loading platinum catalyst as well as preparation method and application thereof

Abstract

The invention relates to a cerium-zirconium compound oxide loading platinum catalyst as well as a preparation method and application thereof. According to the catalyst, a cerium-zirconium compound oxide of a nanorod structure is used as a carrier; platinum is used as an active loaded component; the platinum is loaded on the surface of the cerium-zirconium compound oxide in the form of a single atom or a nano particle. The catalyst can be used for improving the catalytic oxidation activity, particularly the low-temperature catalytic activity, on a particulate matter discharged from a motor vehicle to meet the cold-start requirement of the motor vehicle. The method is simple, easy and feasible; the use level of noble metal is few; therefore, the catalyst can be applied to the combustion of a charcoal-smoke particulate matter, and particularly applied to the combustion of the charcoal-smoke particulate matter discharged from the motor vehicle.

Description

technical field [0001] The invention relates to a platinum-supported catalyst of cerium-zirconium composite oxide and its preparation method and application. The catalyst is used for purifying soot particles emitted by motor vehicles and belongs to the technical field of catalytic oxidation. Background technique [0002] Compared with gasoline engines, diesel engines have high fuel efficiency and low CO 2 The characteristics of emission and high durability play an important role in modern society and are widely used in motor vehicles, ships and large machinery. However, soot particulate matter (PM), the main emission of diesel engines, is causing serious pollution to the atmospheric environment, seriously threatening the ecological environment and human health. Pollutants emitted by motor vehicles are one of the main sources of urban atmospheric PM2.5, especially in large cities, particulate matter, VOC, polycyclic aromatic hydrocarbons, SO 2 , NOx and metal ions are the m...

AI Technical Summary

Problems solved by technology

These methods have their own characteristics, but there are also common shortcomings that the noble metal particles are not easy to disperse evenly, and the particle size of the loaded particles is difficult to maintain uniformity.

For example, noble metal particles are not easy to be evenly loaded on the inner surface of the macroporous carrier, which makes the size distribution of the noble metal particles of the bulk catalyst uneven, which affects the evaluation of catalytic activity; during the use of the catalyst, the active components of the noble metal are easy to agglomerate under high temperature conditions The activity of the catalyst is reduced, and the stability of the catalyst is reduced; the amount of precious metals is relatively high, resulting in the high price of the current motor vehicle exhaust purification device

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