Process for exhaust gas NO.sub.x, CO, and hydrocarbon removal

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine

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Details

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.

REFERENCES:
patent: 4961917 (1990-10-01), Byrne
patent: 5051244 (1991-09-01), Dunne et al.
patent: 5271913 (1993-12-01), Iida et al.
patent: 5284638 (1994-02-01), Hertl et al.
patent: 5310714 (1994-05-01), Grasselli et al.
patent: 5338715 (1994-08-01), Iida et al.

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