| 摘要 |
PURPOSE: A method for manufacturing low precious metal loaded Pt-Pd-Rh three way catalyst suitable for use as DeNOx catalyst is provided, which can reduce consumption amount of expensive precious metal catalyst greatly, compared to an existing manufacturing method. CONSTITUTION: In a platinum-palladium-rhodium three way catalyst preparation method comprising the processes of separately impregnating alumina (Al2O3) with platinum (Pt), palladium (Pd) and rhodium (Rh) solutions respectively, respectively reducing the alumina (Al2O3) separately impregnated with platinum (Pt), palladium (Pd) and rhodium (Rh) solutions by thermal fixation, mixing the reduced resulting materials with each other, adding cerium oxide (CeO2) and mixed solution to the mixture, reacting the mixture, preparing catalyst slurry by milling the reacted material, and coating the catalyst slurry on a ceramic monolith supporter, the preparation method of three way catalyst comprises the processes of mixing the reduced resulting materials width each other; adding a mixture prepared by mixing cerium oxide with cerium-zirconium composite oxide ((Ce·Zr)O2) in a weight ratio of 15:85 to 30:70 to the mixture in a quantity of 30 to 50 g/L for the total apparent volume of supporter; adding praseodymium oxide (PrO2) to the mixture in a quantity of 5 to 7 g/L for the total apparent volume of the supporter; adding a mixed solution to the mixture; reacting the mixture; and adding one compound selected from (LaCe)(FeCo)O3 and (LaSr)(FeCo)O3 that is a metal oxide (perovskite) to the reacted material in a quantity of 40 to 45 g/L for the total apparent volume of the supporter.
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