Mixed zeolite NOx catalyst
AssigneeDelphi Technologies, Inc.
InventorsWilliam J. LaBarge, Mark Hemingway, Joachim Kupe, Galen B. Fisher
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Abstract
A multiple zeolite catalyst mixture for purifying exhaust gases from an internal combustion engine, comprising: a first NO2 to N2 to conversion catalyst component; a second O3 conversion catalyst component; a third HC conversion catalyst component; a fourth N2O decomposition catalyst component; and, a fifth VOC reduction catalyst component; wherein the catalyst component mixture includes about 50 to 75 weight percent of the first and second catalyst components, and about 25 to 50 weight percent of the third, fourth, and fifth catalyst components.
Claims32
A multiple zeolite catalyst mixture for purifying exhaust gases form an internal combustion engine, comprising:
- a first NO2 to N2 conversion catalyst component comprising a first hydrophilic zeolite;
- a second O3 conversion catalyst component comprising a zeolite;
- a third HC conversion catalyst component, comprising a first hydrophobic zeolite;
- a fourth N2O decomposition catalyst component comprising a zeolite;
- and,
- a fifth VOC reduction catalyst component comprising a zeolite;
- wherein the catalyst mixture comprises about 50 to 75 weight percent of the first and second catalyst components, and about 25 to 50 weight percent of the third, fourth, and fifth catalyst components.
A multiple zeolite catalyst mixture comprising:
- a first catalyst component comprising a Y type hydrophilic zeolite with a silica to alumina ratio ranging from about 1 to 8, and having a barium ion exchanged element at a level ranging from about 12 to 28 weight percent;
- a second catalyst component comprising a X type hydrophilic zeolite with a silica to alumina ratio ranging from about 1 to 8, and having a manganse ion exchanged element at a level ranging from about 12 to 25 weight percent;
- a third catalyst component comprising a ZSM-5 hydrophobic zeolite with a silica to alumina ratio ranging from about 25 to 80, and having a nickel ion exchanged element at a level ranging from about 0.1 to 1.0;
- a fourth catalyst component comprising a ZSM-5 hydrophobic zeolite with a silica to alumina ratio ranging from about 25 to 80, and having an ion exchanged element selected from rhodium, palladium, and mixtures thereof at a level ranging from about 0.1 to 1.0 weight percent;
- and
- a fifth catalyst component comprising a ZSM-5 hydrophobic zeolite with a silica to alumina ratio ranging from about 80 to 280, and having a cobalt ion exchanged element at a level ranging from about 0.1 to 2.0 weight percent.
A multiple zeolite catalyst mixture for purifying exhaust gases from an internal combustion engine, comprising:
- a first NO2 to N2 conversion catalyst component comprising a first hydrophilic zeolite;
- a second O3 conversion catalyst component comprising a second hydrophilic zeolite;
- a third HC conversion catalyst component comprising a first hydrophobic zeolite;
- a fourth N2O decomposition catalyst component comprising a second hydrophobic zeolite;
- and,
- a fifth VOC reduction catalyst component comprising a third hydrophobic zeolite;
- wherein the catalyst mixture comprises about 50 to 75 weight percent of the first and second catalyst components, and about 25 to 50 weight percent of the third, fourth, and fifth catalyst components.
Dependencies are inferred from the claim text.