SYSTEM FOR PROTECTING CATALYST FROM EXHAUST GAS DEPRIVED OF OXYGEN Russian patent published in 2021 - IPC B01D53/86 B01D53/94 F01N3/23 

FIELD: emission control devices.

SUBSTANCE: exhaust gas purification system for reducing emissions from the exhaust stream contains: a. an oxygen detection system; b. a catalyst containing a NO_x accumulation catalyst or a cold start catalyst; and c. an air injection system located between the oxygen detection system and the catalyst to inject air into the exhaust stream under specified exhaust conditions to protect the catalyst from oxygen-free conditions.

EFFECT: ensuring the protection of the catalyst in conditions of oxygen-free exhaust.

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