US 11,686,236 B1 · Device for the reduction of ammonia and nitrogen oxides emissions

Abstract

An exhaust gas purifying system for an engine includes a three-way catalyst, a particulate filter, an ammonia sorbent unit, an exhaust gas purifying catalyst unit, and a gas injection component including an oxygen-containing gas, all coupled to an exhaust line. Methods for purifying exhaust gas from an engine include exposing the exhaust gas to a three-way catalyst and a particulate filter, thus generating ammonia. The ammonia may be stored in an ammonia sorbent unit during a cold start condition. An oxygen-containing gas may be injected into the exhaust line. Once the ammonia sorbent has reached a desorption temperature, the ammonia may be released into the exhaust line and exposed to an exhaust gas purifying catalyst unit. The exhaust gas purifying catalyst partially oxidizes the ammonia to nitrous oxides (NOx) and subsequently catalyzes a reaction between the remaining ammonia and the nitrous oxides to give nitrogen gas and water.

Claims20

Dependent claims

An exhaust gas purifying system for an engine comprising:

a three-way catalyst coupled to an exhaust line;
a particulate filter coupled to the exhaust line downstream of the three-way catalyst;
an ammonia sorbent unit coupled to the exhaust line downstream of the particulate filter;
an exhaust gas purifying catalyst unit coupled to the exhaust line downstream of the ammonia sorbent unit;
and
a gas injection component coupled to the exhaust line downstream of the particulate filter, the gas injection component comprising an oxygen-containing gas.

3 more elements

Dependencies are inferred from the claim text.

Device for the reduction of ammonia and nitrogen oxides emissions

Life of this patent

Device for the reduction of ammonia and nitrogen oxides emissions

Life of this patent

Abstract

Claims20