System and method for exhaust gas aftertreatment

A system comprising:

• a first selective catalytic reduction device configured to receive an exhaust gas flow from an internal combustion engine;
• an exhaust gas heat recovery device positioned downstream of the first selective catalytic reduction device, where the exhaust gas heat recovery device comprises a heat exchanger with a nitrogen oxide adsorbing catalyst disposed in the heat exchanger;
• a controller configured to control a flow of a heat transfer fluid to the heat exchanger based on a temperature of the internal combustion engine proximate moving engine components;
• and
• a second selective catalytic reduction device positioned downstream of the exhaust gas heat recovery device, wherein the second selective catalytic reduction device is configured to remove nitrogen oxides from the exhaust gas flow at a selected temperature.

An exhaust aftertreatment system, comprising:

• a first selective catalytic reduction device configured to receive an exhaust gas flow from an internal combustion engine;
• an exhaust gas heat recovery device positioned downstream of the first selective catalytic reduction device, where the exhaust gas heat recovery device comprises a heat exchanger with a nitrogen oxide adsorbing catalyst disposed in the heat exchanger and a valve to control flow of the exhaust gas flow through the heat exchanger;
• and
• a second selective catalytic reduction device positioned downstream of the exhaust gas heat recovery device, wherein the second selective catalytic reduction device is configured to reduce nitrogen oxides from the exhaust gas flow at a selected temperature.