Purifying composition with NOx treatment and internal combustion engine exhaust gases
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United States of America Patent
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Feb 8, 2005
Grant Date -
N/A
app pub date -
Mar 4, 2002
filing date -
May 7, 1999
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Abstract
A composition for purifying exhaust gases of an internal combustion engine capable of consuming fuel with lean air-fuel ratios includes elements adsorbing the NO.sub.x present in the exhaust gases, in the presence of excess oxygen and releasing the adsorbed NO.sub.x when the oxygen concentration of the exhaust gases decreases. The NO.sub.x adsorbing element includes in combination: a first composition comprising a support and an active phase, the active phase being based on manganese and at least another element A selected among, alkalines and alkaline-earths, the manganese and element A being chemically bound; a second composition including a support and an active phase based on manganese and at least another element B selected among alkalines, alkaline-earths and rare earths, the second composition having or being capable of having a specific surface area of at least 80 m.sup.2 /g after being calcined at 800.degree. C., and furthermore, a reducing and/or three-way catalyst function is incorporated in the NO.sub.x adsorbing element.
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