Shell Oil Comapny

John G Buglass

Ke Liu

Wayne G Wnuck

A single valve () directs engine exhaust () toward alternative NOx traps () which are adjacent to either diesel particulate filters () or low temperature water gas shift catalysts (). Syngas is either provided from a source () or by in-line catalytic partial oxidizers () which may have diesel oxidation catalysts ahead of them in the flow and which receive fuel from the engine fuel source () through nozzles ().

Internal combustion engine exhaust treatment having a single valve directing exhaust to dual NOx traps

Oxides of nitrogen are adsorbed onto the surfaces of, and particulates are trapped in, pores of channels (-) in a porous, interdigitated ceramic particulate filter () that has relative rotation with respect to a gas inlet distributor (). The distributor has a baffle () or ribs () that causes constantly flowing engine exhaust () to enter the filter channels over a large portion of a revolution of the adsorption bed or the distributor, and causes constantly flowing syngas () to thereafter pass through those passages during a small portion of each revolution. Either the inlet gas distributor () or the filter bed () may be rotated to distribute the gases. Dual, alternately regenerated filters () may be used.

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Glastonbury, CT, United States of America

John G Buglass