LOW TEMPERATURE SELECTIVE CATALYTIC REDUCTION CATALYST AND ASSOCIATED SYSTEMS AND METHODS
First Claim
Patent Images
1. A selective catalytic reduction (SCR) catalyst, comprising:
- a carrier layer made from a material selected from the group consisting of TiO2, Al2O3, SiO2, ZrO2, GaO2, TiO2—
Al2O3, TiO2—
SiO2, TiO2—
GaO2, TiO2—
ZrO2, CeO2, CeO2—
ZrO2, Al2O3—
SiO2, Al2O3—
ZrO2, TiO2—
SiO2—
ZrO2, and TiO2—
Al2O3—
SiO2; and
a catalytic layer coupled to the carrier layer, the catalytic layer being made from a material selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Ag, Ge, and Nb;
wherein the combined carrier layer and catalytic layer are configured to reduce NOx in an exhaust gas stream at an exhaust temperature between about 60°
C. and about 250°
C.
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Abstract
According to one embodiment, described herein is an exhaust gas after-treatment system that is coupleable in exhaust gas stream receiving communication with an internal combustion engine. The exhaust gas after-treatment system includes a low temperature SCR catalyst configured to reduce NOx in exhaust gas having a temperature below a temperature threshold. The system also includes a normal-to-high temperature SCR catalyst configured to reduce NOx in exhaust gas having a temperature above the temperature threshold.
144 Citations
20 Claims
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1. A selective catalytic reduction (SCR) catalyst, comprising:
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a carrier layer made from a material selected from the group consisting of TiO2, Al2O3, SiO2, ZrO2, GaO2, TiO2—
Al2O3, TiO2—
SiO2, TiO2—
GaO2, TiO2—
ZrO2, CeO2, CeO2—
ZrO2, Al2O3—
SiO2, Al2O3—
ZrO2, TiO2—
SiO2—
ZrO2, and TiO2—
Al2O3—
SiO2; anda catalytic layer coupled to the carrier layer, the catalytic layer being made from a material selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, Ag, Ge, and Nb; wherein the combined carrier layer and catalytic layer are configured to reduce NOx in an exhaust gas stream at an exhaust temperature between about 60°
C. and about 250°
C. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An exhaust gas after-treatment system coupleable in exhaust gas stream receiving communication with an internal combustion engine, comprising:
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a low temperature selective catalytic reduction (SCR) catalyst configured to reduce NOx in exhaust gas having a temperature below a temperature threshold; and a normal-to-high temperature SCR catalyst configured to reduce NOx in exhaust gas having a temperature above the temperature threshold. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for treating an exhaust gas stream, comprising:
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providing an exhaust after-treatment system comprising a low temperature selective catalytic reduction (SCR) catalyst and a normal-to-high temperature SCR catalyst; reducing NOx in an exhaust gas stream with the low temperature SCR catalyst if a temperature of the exhaust gas stream is within a low temperature range; and reducing NOx in the exhaust gas stream with the normal-to-high temperature SCR catalyst if the temperature of the exhaust gas stream is within a normal-to-high temperature range. - View Dependent Claims (19, 20)
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Specification