Cummins Inc.

Rohan A Siddhanthi

Michael Haas

Michael J Ruth

Krishna Kamasamudram

Krishna Pradeep Chilumukuru

Bryon D Staebler

Shirish S Punde

Neal W Wallace

An exhaust gas aftertreatment system for an internal combustion engine includes an inlet conduit, a reductant decomposition chamber, a first selective catalytic reduction (SCR) catalyst member, a second SCR catalyst member, a mixing chamber, a particulate filter, a reductant delivery system, and a hydrocarbon delivery system. The inlet conduit is configured to receive exhaust gas from the internal combustion engine. The reductant decomposition chamber is fluidly coupled to the inlet conduit and configured to receive the exhaust gas from the inlet conduit. The first SCR catalyst member is fluidly coupled to the reductant decomposition chamber and configured to receive the exhaust gas from the reductant decomposition chamber. The second SCR catalyst member is fluidly coupled to the first SCR catalyst member and is configured to receive the exhaust gas from the first SCR catalyst member.

Exhaust gas aftertreatment system with a selective catalytic reduction catalyst member upstream of a particulate filter

An exhaust aftertreatment system configured to reduce nitrous oxide (NO) formation includes a first selective catalytic reduction (SCR) catalyst. The first SCR catalyst is configured for low NO formation and low ammonia (NH) storage capacity. A second SCR catalyst is positioned downstream of the first SCR catalyst. The second SCR catalyst is configured for high NHstorage capacity.

Advanced exhaust aftertreatment system architecture

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Columbus, IN, United States of America

Rohan A Siddhanthi