Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1995-02-22
1997-10-14
Bos, Steven
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232137, 4232135, B01D 5392, B01D 5362, B01D 5372, B01D 5356
Patent
active
056769121
ABSTRACT:
There is provided a multizone catalytic process for the treatment of exhaust gas comprising nitrogen oxides, hydrocarbons, and carbon monoxide. In the multizone catalytic process, the exhaust gas is directed through a first zone, a second zone, and a third zone. The first zone comprises a catalyst that is effective for the three-way conversion of nitrogen oxides, hydrocarbons, and carbon monoxide. The second zone comprises materials effective to sorb hydrocarbons, e.g., zeolites ZSM-5 and Beta, particularly iron modified zeolites ZSM-5 and Beta. The second zone is effective for the adsorption of hydrocarbons from the exhaust gas during the cold-start period of operation of an internal combustion engine. The third zone comprises a catalyst that is effective for the oxidation of hydrocarbons and carbon monoxide.
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Sharma Sanjay B.
Shihabi David S.
Bos Steven
DiMaur Peter T.
Harris Gerald L.
Keen Malcolm D.
Mobil Oil Corporation
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