Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1998-12-18
2000-10-31
Dunn, Tom
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
4232135, 423235, 4232391, 4232451, 423246, 423247, 423248, 423608, 423635, 423641, B01J 802
Patent
active
061398136
ABSTRACT:
The invention is a method for treating exhaust gas containing carbon monoxide, hydrocarbons, and nitrogen oxides generated by a lean burn internal combustion engine. It includes bringing the exhaust gas into contact with a particular metal-zirconium oxide material made by sol-gel processing and which includes at least 0.1 wt. % precious metal. The alkoxides include heterometallic alkoxides containing zirconium and alkali metal or alkaline earth metal. Optionally the oxide may contain a lanthanide metal. Under lean-burn conditions nitrogen oxides are absorbed on the oxide and when the oxygen concentration is lowered the absorbed nitrogen oxide are desorbed and reduced over the precious metal.
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Nakouzi-Phillips Sabine Rita
Narula Chaitanya Kumar
Dunn Tom
Ford Global Technologies Inc.
May Roger L.
Melotik Lorraine S.
Nguyen Cam N.
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