Exhaust gas conversion method and apparatus using thermally stab

Details Exhaust gas conversion method and apparatus using thermally stab Exhaust gas conversion method and apparatus using thermally stab

1994-01-18

1995-09-05

McMahon, Timothy M.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422177, 4232135, 4232137, B01D 5356

Patent

active

054476941

ABSTRACT:
A system and method are disclosed for converting exhaust gas which comprises NO.sub.x, CO, and hydrocarbons, to innocuous products. Exhaust gas is contacted in undiverted flow with a zeolite suitable for adsorption of hydrocarbons, and with a main catalyst suitable for conversion of NO.sub.x, CO, and hydrocarbons to innocuous products. Adsorption occurs when the temperature of the zeolite is suitable therefor. Conversion occurs when the temperature of the main catalyst is suitable therefor. The zeolite and main catalyst are connected directly to one another, that is, in-line, without by-pass valving. The zeolite can be Y zeolite, Beta, ZSM-5, and combinations thereof, and has a SiO.sub.2 to Al.sub.2 O.sub.3 mole ratio of no greater than about 200, and is ion exchanged with a metal which can be rare earth, chromium, and combinations thereof.

REFERENCES:
patent: 5185305 (1993-02-01), Subramanian et al.

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