Ford Global Technolgoies, LLC

John Vito Cavataio

Haren S Gandhi

Robert Henry Hammerle

Yisun Cheng

Michiel Jacques Van Nieuwstadt

Thomas Alan Brewbaker

This catalyst system simultaneously removes ammonia and enhances net NOx conversion by placing an NH-SCR catalyst formulation downstream of a lean NOx trap. By doing so, the NH-SCR catalyst adsorbs the ammonia from the upstream lean NOx trap generated during the rich pulses. The stored ammonia then reacts with the NOx emitted from the upstream lean NOx trap-enhancing the net NOx conversion rate significantly, while depleting the stored ammonia. By combining the lean NOx trap with the NH-SCR catalyst, the system allows for the reduction or elimination of NHand NOx slip, reduction in NOx spikes and thus an improved net NOx conversion during lean and rich operation.

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This catalyst system simultaneously removes ammonia and enhances net NO, conversion by placing an NH-SCR catalyst formulation downstream of a lean NOtrap. By doing so, the NH-SCR catalyst adsorbs the ammonia from the upstream lean NOtrap generated during the rich pulses. The stored ammonia then reacts with the NOemitted from the upstream lean NOtrap&#x2014;enhancing the net NOconversion rate significantly, while depleting the stored ammonia. By combining the lean NOtrap with the NH-SCR catalyst, the system allows for the reduction or elimination of NHand NOslip, reduction in NOspikes and thus an improved net NOconversion during lean and rich operation.

This catalyst system simultaneously removes ammonia and enhances net NOx conversion by placing an NH&#x2014;SCR catalyst formulation downstream of a lean NOx trap. By doing so, the NH&#x2014;SCR catalyst adsorbs the ammonia from the upstream lean NOx trap generated during the rich pulses. The stored ammonia then reacts with the NOx emitted from the upstream lean NOx trap-enhancing the net NOx conversion rate significantly, while depleting the stored ammonia. By combining the lean NOx trap with the NH&#x2014;SCR catalyst, the system allows for the reduction or elimination of NHand NOx slip, reduction in NOx spikes and thus an improved net NOx conversion during lean and rich operation.

This catalyst system simultaneously removes ammonia and enhances net NOconversion by placing an NH&#x2014;SCR catalyst formulation downstream of a lean NOtrap. By doing so, the NH&#x2014;SCR catalyst adsorbs the ammonia from the upstream lean NOtrap generated during the rich pulses. The stored ammonia then reacts with the NOemitted from the upstream lean NOtrap&#x2014;enhancing the net NOconversion rate significantly, while depleting the stored ammonia. By combining the lean NOtrap with the NH&#x2014;SCR catalyst, the system allows for the reduction or elimination of NHand NOslip, reduction in NOspikes and thus an improved net NOconversion during lean and rich operation.

This catalyst system simultaneously removes ammonia and enhances net NOx conversion by placing an NH-SCR catalyst formulation downstream of a lean NOx trap. By doing so, the NH-SCR catalyst adsorbs the ammonia from the upstream lean NOx trap generated during the rich pulses. The stored ammonia then reacts with the NOx emitted from the upstream lean NOx trap&#x2014;enhancing the net NOx conversion rate significantly, while depleting the stored ammonia. By combining the lean NOx trap with the NH-SCR catalyst, the system allows for the reduction or elimination of NHand NOx slip, reduction in NOx spikes and thus an improved net NOx conversion during lean and rich operation.

A method and system for simultaneously regenerating a particulate filter coupled to an internal combustion engine and for desulfating a lean NOx trap disposed downstream of the particulate filter. The method includes adjusting at least one engine operating parameter to maintain a desired air fuel ratio for gases exiting the particulate filter in accordance with a difference between a reference set point air fuel ratio level and the air fuel ratio of gases exiting the particulate filter and wherein the reference set point level is changed between a rich air fuel ratio and a lean air fuel ratio as a function of the air fuel ratio of the gases exiting the lean NOx trap.

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Dearborn, MI, United States of America

John Vito Cavataio