Potassium/manganese nitrogen oxide traps for lean-burn engine operation

U.S. Patent Number: 5837212

Abstract: The invention is a nitrogen oxide trap comprising a porous support; and catalysts consisting of manganese and potassium loaded on the porous support. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap sorbs nitrogen oxides and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas.

Inventors: Hepburn; Jeffrey Scott (Dearborn, MI), Thanasiu; Eva (Trenton, MI), Watkins; William Lewis Henderson (Toledo, OH), Hubbard; Carolyn Parks (Dearborn Heights, MI), Dobson; Douglas A. (Livonia, MI), Gandhi; Haren Sakarlal (Farmington Hills, MI)

Assignee: Ford Global Technologies, Inc. (Dearborn, MI)

Application Number: 08/531,502

Issued: 1998-11-17

Expired: 2006-11-17

Classes: 423/213.2 ; 423/239.1

Field of search: 502/324,525 423/239.1,213.2

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