Patent ID: 8695329
Filing Date: 2014-04-15
Classification: B01D,F01N,Y02A,Y02T

Abstract:
1. A process for decreasing the amount of nitrogen oxides present in the lean exhaust gas from an internal combustion engine by selective catalytic reduction by means of ammonia, comprising: oxidizing a portion of nitrogen monoxide present in an exhaust gas to nitrogen dioxide over a precatalyst, the precatalyst containing at least one oxidation-active catalytic component, the gas has a target NO regualting a temperature of the precatalyst independently of an operating state of the engine, by temperature-control device that selectively heats and cools the precatalyst, so that the target NO regulating the temperature of the precatalyst by the temperature-control device includes selectively heating and cooling the precatalyst such that the exhaust gas has a first NO