Device for purifying exhaust gas
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsYoon Sang Nam, Hyokyung Lee
Life of this patent
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Abstract
A device for purifying exhaust gas provided to purify exhaust gas in an engine, may include an exhaust line through which exhaust gas discharged from the engine passes, a NOx storage catalyst that is installed in the exhaust line to absorb a nitrogen oxide discharged from the exhaust gas, and detach an absorbed nitrogen oxide when a temperature of a catalyst is higher than a predetermined value, and a three way catalyst (TWC) arranged in rear of the NOx storage catalyst for reducing the nitrogen oxide detached from the NOx storage catalyst, wherein the NOx storage catalyst includes an LTA zeolite catalyst.
Claims13
A device for purifying exhaust gas provided to purify exhaust gas in an engine, the device comprising:
- an exhaust line through which exhaust gas discharged from the engine passes;
- a nitrogen oxide (NOx) storage catalyst that is installed in the exhaust line to absorb a nitrogen oxide discharged from the exhaust gas, and detach an absorbed nitrogen oxide when a temperature of the NOx storage catalyst is higher than a predetermined value;
- and
- a three way catalyst (TWC) arranged in rear of the NOx storage catalyst for reducing the nitrogen oxide detached from the NOx storage catalyst,
- wherein the NOx storage catalyst includes a Linde-Type A (LTA) zeolite catalyst,
- wherein the LTA zeolite catalyst includes a palladium (Pd), and
- wherein a content of the Pd is about 0 wt % to about 3 wt % with respect to an entire weight of the LTA zeolite catalyst.
A method for purifying an exhaust gas in an engine by a device for purifying exhaust gas, the method comprising:
- measuring a temperature of the exhaust gas and a temperature of a NOx storage catalyst;
- increasing the temperature of the exhaust gas to absorb a nitrogen oxide in the NOx storage catalyst;
- and
- controlling the exhaust gas in a rich condition when the temperature of the NOx storage catalyst is higher than a predetermined value,
- wherein the NOx storage catalyst includes an LTA zeolite catalyst,
- wherein the LTA zeolite catalyst includes a palladium (Pd), and
- wherein a content of the Pd is about 0.1 wt % to about 3 wt % with respect to an entire weight of the LTA zeolite catalyst.
Dependencies are inferred from the claim text.