Sulfur tolerant Pt/lithium NOx traps

Details Sulfur tolerant Pt/lithium NOx traps Sulfur tolerant Pt/lithium NOx traps

1996-06-13

1998-06-02

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60299, 4232132, 4232391, B01J 802, F01N 328

Patent

active

057584893

ABSTRACT:
The invention is a nitrogen oxide trap comprising a porous support; and catalysts comprising platinum and lithium loaded on the porous support, the lithium being present in a high loading of at least 10 weight percent based on the weight of 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 (NOx) and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas, the desorbed NOx being converted to N.sub.2 and O.sub.2.

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patent: 5543124 (1996-08-01), Yokota et al.
patent: 5589147 (1996-12-01), Farnos et al.

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