Caterpillar Inc.

Battelle Memorial Institute

Ashok A Chanda

Paul Park

Christopher Lyle Aardahl

Craig F Habeger

Kent A Koshkarian

John T Vachon

Randall R Richards

Mari Lou Balmer-Miller

The present disclosure pertains to a system and method for treatment of oxygen rich exhaust and more specifically to a method and system that combines non-thermal plasma with a metal doped &#x3b3;-alumina catalyst. Current catalyst systems for the treatment of oxygen rich exhaust are capable of achieving only approximately 7 to 12% NOreduction as a passive system and only 25&#x2013;40% reduction when a supplemental hydrocarbon reductant is injected into the exhaust stream. It has been found that treatment of an oxygen rich exhaust initially with a non-thermal plasma and followed by subsequent treatment with a metal doped &#x3b3;-alumina prepared by the sol gel method is capable of increasing the NOreduction to a level of approximately 90% in the absence of SOand 80% in the presence of 20 ppm of SO. Especially useful metals have been found to be indium, gallium, and tin.

Method and system for the combination of non-thermal plasma and metal/metal oxide doped &#x3b3;-alumina catalysts for diesel engine exhaust aftertreatment system

A method and system for late cycle injection of oxygen enriched air into the combustion chamber of an internal combustion engine is disclosed. The late cycle oxygen injection system is part of an airflow management system that effectively controls the use of oxygen and nitrogen available in the intake air. The preferred system comprises an intake air separation device adapted for separating a prescribed portion of intake air into a flow of oxygen enriched air and a flow of nitrogen enriched air. The system includes an oxygen enriched air flow circuit extending from the intake air separating device to one or more combustion chambers and a control device adapted for controlling the introduction of the oxygen enriched air into the combustion chambers late in a combustion cycle in response to selected engine operating conditions such as engine speed or engine load or both. Preferably, the introduction of the oxygen enriched air into the combustion chamber occurs late in a combustion cycle at a crank angle between about 20 degrees and 120 degrees after top dead center and lasts for a prescribed time interval between about 5 degrees and 20 degrees of crank angle movement.

Method and system for late cycle oxygen injection in an internal

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Peoria, IL, United States of America

Ashok A Chanda