Exhaust aftertreatment system, an engine system, and methods for controlling operation thereof

Abstract

An engine system and an exhaust aftertreatment system are arranged in an exhaust flow path of a hydrogen combustion engine, and include a selective catalytic reduction device configured to reduce nitrogen oxides; a hydrogen and ammonia slip catalyst device arranged downstream of the SCR device in the exhaust flow path, the HASC device comprising an oxidation catalyst coating and a metal-zeolite coating, a loading of the metal-zeolite coating decreasing along a direction of flow; and a particulate filter arranged downstream of the HASC device. In response to determining that the temperature of the HASC device is below a threshold, the engine system is operated with a relatively high percentage of water in the engine out exhaust gases, whereby water is adsorbed on the metal-zeolite coating and a quick temperature rise is achieved.

Dependencies are inferred from the claim text.