System for reducing NO.sub.x from mobile source engine exhaust
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United States of America Patent
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Aug 12, 1997
Grant Date -
N/A
app pub date -
Nov 2, 1995
filing date -
Nov 2, 1995
priority date (Note) -
Expired
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Abstract
A process and system for reducing cold start NO.sub.x, carbon monoxide, and hydrocarbon emissions from mobile source engine exhaust utilizes adsorption and desorption of NO.sub.x compounds on a regenerable sorbent material. Molecules of NO.sub.x are adsorbed onto the sorbent material during the ineffective warm up period of a three-way catalytic converter. When the catalytic converter reaches operating temperatures, the NO.sub.x molecules are thermally desorbed from the sorbent material and delivered to the catalytic converter for effective reduction to molecular nitrogen.
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