Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-12-18
1999-09-14
Look, Edward K.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60301, 4232135, 4232391, F01N 300
Patent
active
059504218
ABSTRACT:
The invention is a method of treating exhaust gases generated by an internal combustion engine using a NOx trap in the exhaust gas system. The method comprises locating an essentially alkaline earth-free nitrogen oxide trap in the exhaust gas passage and cycling the air/fuel ratio of the exhaust gases entering the trap between lean and rich, such that the trap absorbs nitrogen oxides during the lean cycle and desorbs the nitrogen oxides when the concentration of the oxygen in the exhaust gas is lowered as during a rich cycle. The trap comprises: (a) a porous support material comprising mostly .gamma.-alumina and (b) metals consisting essentially of 0.1 to 2 wt. % tungsten oxide and precious metal comprising 0.5 to 4 wt. % platinum deposited on the support, the amount of said metals being individually based on the weight of said support material. The desorbed nitrogen oxides may be converted over the precious metal to N.sub.2 and O.sub.2 by reductants like hydrocarbons present in the exhaust gas.
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patent: 5473887 (1995-12-01), Takeshima et al.
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patent: 5727385 (1998-03-01), Hepburn
Chattha Mohinder S.
Kudla Robert J.
Montreuil Clifford Norman
Ford Global Technologies Inc.
Look Edward K.
Melotik Lorraine S.
Tran Binh
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