METHOD OF REMOVING IMPURITIES FROM DIESEL ENGINE EXHAUST GAS Russian patent published in 2014 - IPC B01D53/94 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method of removing impurities from diesel engine exhaust gas includes steps of injecting a reducing agent into the engine exhaust gas, said reducing agent containing urea or ammonia, selective catalytic reduction of nitrogen oxides contained in the exhaust gas using the reducing agent, and periodically injecting a hydrocarbon into the obtained output stream. The method includes the following steps: oxidising carbon monoxide, solid particles of incompletely combusted hydrocarbons and the added hydrocarbon to carbon dioxide and water; selective oxidation of possible excess reducing agent to free nitrogen; filtering the output stream by passing the gas through a catalytic filter, where the remaining solid particles are trapped in the filter and where carbon monoxide, solid particles and hydrocarbons are oxidised to carbon dioxide and water, and the reducing agent is selectively oxidised to nitrogen.

EFFECT: invention improves purification of a diesel engine exhaust gas from impurities.

15 cl, 3 tbl, 3 dwg