A high bond strength poc coating

Abstract

The invention discloses a POC (particle oxidation catalyst) coating with high adhesive strength. The coating comprises a component A, a component B, a component C and deionized water, wherein the mass ratio of the component A to the component B is 9-15:1, the mass of the component C is 1.5-5 percent of total mass of components A and B; the component A, the component B and the deionized water are mixed to obtain an AB mixture; the components A and B are totally 5-20 percent of the AB mixture in percentage by mass; the component A comprises the following components in percentage by mass: 20-60 percent of ceric dioxide, 10-40 percent of zirconium dioxide, 5-20 percent of lanthanum oxide, 5-20 percent of praseodymium oxide and 0.5-1 percent of dispersant; the component B comprises the following components in percentage by mass: 80-90 percent of alumina gel and 10-20 percent of dispersant; the component C is one or more out of Pt, Pd and Rh. The POC coating has excellent mechanical performance and high adhesive strength, has the advantages of low falling rate, long service life and low maintenance cost, and guarantees the trapping performance of POC to particles.

Description

technical field [0001] The invention relates to a high bonding strength POC coating. Background technique [0002] Particulate matter in diesel engine exhaust is a pollutant that has a huge harmful effect on the social environment and human physical and mental health. POC (ParticleOxidationCatalyst) is an effective method for treating particulate matter in diesel engine exhaust. POC is made of wire mesh or metal felt. When the diesel engine exhaust passes through the POC, the coarser particles are directly captured by the surface of the POC because they cannot pass through the mesh of the wire mesh. When the medium swims to the low-temperature POC surface, it is captured due to collision agglomeration, and some small particles are adsorbed and captured when flowing through the POC surface. Although POC has good permeability, after long-term use, the accumulated particles in POC will increase the back pressure of the entire exhaust system and affect the performance of the e...

AI Technical Summary

Problems solved by technology

If the catalyst coating material on the POC falls off under severe mechanical vibration, it will seriously affect the catalytic combustion of the captured particulate matter in the POC, thus affecting the particulate capture performance and service life of the entire POC