Platinum-containing catalysts for combustion engines
AssigneeBASF SE
InventorsXinyi Wei, Stanley A. Roth, Haiyang Zhu
Life of this patent
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Abstract
Emissions treatment systems of combustion engines are provided, which comprise a platinum-containing catalyst that is degreened during production, which is before exposure to operating conditions of a vehicle having a diesel engine. The platinum-containing catalyst, in the form of a platinum component on a high surface area refractory metal oxide support, exhibits a vibration frequency of about 2085 to about 2105 cm−1 as measured by CO-DRIFTS. Such catalytic material is essentially-free of platinum oxide species found at greater than about 2110 cm−1 as measured by CO-DRIFTS. Such catalysts can provide excellent and consistent conversion of nitrogen oxide (NO) to nitrogen dioxide (NO2).
Claims16
A method for forming a fully degreened diesel oxidation catalyst composite, the method comprising:
- obtaining a catalytic material comprising a platinum component and a refractory metal oxide support having a BET surface area of higher than 30 m2/g, wherein the refractory metal oxide support is selected from the group consisting of alumina, ceria, zirconia, titania, silica, magnesia, neodymia, MgAl2O4, BaAl2O4, LaAlO3, Ba-doped alumina, Ce-doped alumina, La-doped alumina and combinations thereof;
- depositing the catalytic material onto a carrier to form a diesel oxidation catalyst composite wherein the carrier is selected from the group consisting of a ceramic honeycomb structure, a metal honeycomb structure, a flow-through substrate, a wall-flow filter substrate, a metallic carrier, and an open cell foam substrate;
- and
- treating the catalytic material at a temperature of at least 500° C. in the presence of humidity and oxygen to form the fully degreened diesel oxidation catalyst composite.
Dependencies are inferred from the claim text.