Patent ID: 8601796

Claim:
Selective catalytic reduction system for reducing nitric oxides emission levels from a compression ignition engine, comprising a first reductant injector located upstream of a first catalyst comprising a selective catalytic reduction coating and an oxidizing catalytic coating, the first catalyst comprising an upstream wall surface and a downstream wall surface, one of the upstream wall surface and the downstream wall surface being coated with the selective catalytic reduction coating and the other one of the upstream wall surface and the downstream wall surface being coated with the oxidizing catalytic coating separate from the selective catalytic reduction coating; a second reductant injector located downstream of the first catalyst; a second catalyst placed downstream of the second reductant injector and comprising a selective catalytic reduction coating, wherein the first catalyst comprises a filter function to trap particles formed by combustion, and an exhaust governor disposed upstream of any other components comprising the selective catalytic reduction system, the exhaust governor being located downstream of the compression ignition engine and being arranged to manage the temperature, and thus the performance window, of the selective catalytic reduction system.