Combination of Pseudobrookite Oxide and Low Loading of PGM as High Sulfur-Resistant Catalyst for Diesel Oxidation Applications
AssigneeCdti Advanced Materials, Inc.
InventorsZahra Nazarpoor, Stephen J. Golden
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Abstract
Sulfur-resistant synergized platinum group metals (SPGM) catalysts with significant oxidation capabilities are disclosed. Catalytic layers of SPGM catalyst samples are prepared using conventional synthesis techniques to build a washcoat layer completely or substantially free of PGM material. The SPGM catalyst includes a washcoat layer comprising YMn2O5 (pseudobrookite) and an overcoat layer including a Pt/Pd composition with total PGM loading of at or below 5.0 g/ft3. Resistance to sulfur poisoning and catalytic stability is observed under 5.2 gS/L condition to assess significant improvements in NO oxidation, and HC and CO conversions.
Claims16
A catalytic composition comprising:
- a platinum group metal and YMn2O5.
A catalytic composition suitable for diesel oxidation catalysts applications, comprising:
- a platinum group metal and at least one pseudobrookite structured compound.
A catalyst system, comprising:
- at least one substrate;
- at least one washcoat comprising a pseudobrookite structured compound;
- and
- at least one overcoat comprising a platinum group metal.
Dependencies are inferred from the claim text.