Catalyst coating liquid manufacturing method and catalyst body thereby

摘要

A method of preparing a catalyst coating solution may realize high purification performance by preventing the active surface of a catalyst from being reduced, and may greatly improve the durability of a catalyst by preventing soot from directly coming into contact with a catalyst layer containing a precious metal so that the catalyst layer can continuously exhibit proper purification performance. A method of manufacturing a catalyst body using the catalyst coating solution, and a catalyst body manufactured by the method are also described.

主权项

1. A catalyst body, manufactured by a method, wherein the method comprising the steps of:
dipping a carrier supporting a catalyst into a catalyst coating solution to coat the carrier with the catalyst coating solution, wherein the catalyst coating solution is prepared by:
milling a slurry solution prepared by dissolving an alumina-based metal oxide as a powdered catalyst in a solvent in a concentration of 50˜400 g/L to pulverize the alumina-based metal oxide such that a ratio of alumina-based metal oxide particles having a size of 12 μm or less to total alumina-based metal oxide particles is 90% or more;milling a slurry solution prepared by dissolving a soot removing metal oxide as a powdered catalyst in a solvent in a concentration of 50˜400 g/L to pulverize the soot removing metal oxide such that a ratio of soot removing metal oxide particles having a size of 20 μm or less to total soot removing metal oxide particles is 90% or more; andmixing the slurry solution containing the pulverized alumina-based metal oxide with the slurry solution containing the pulverized soot removing metal oxide while adding water to obtain a mixed slurry solution containing the alumina-based metal oxide and soot removing metal oxide as solids in a concentration of 5˜100 g/L such that the weight ratio of the alumina-based metal oxide to the soot removing metal oxide is 40/60˜20/80; and drying and calcining the carrier coated with the catalyst coating solution, wherein the catalyst body is formed by disposing the coated catalyst layer formed in the coating step and the calcining step on a catalyst layer containing a precious metal such that the former lays on top of the latter.