Base metal oxides oxidation catalyst

Details Base metal oxides oxidation catalyst Base metal oxides oxidation catalyst

2010-08-10

2011-11-15

Vanoy, Timothy (Department: 1734)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C423S213500, C423S239100, C423S245300, C423S247000, C060S299000

Reexamination Certificate

active

08057767

ABSTRACT:
Chemical species such as nitrogen oxide (NO), carbon monoxide, and low molecular weight hydrocarbons (e.g., C1-C5and saturated or ethylenically unsaturated) in an oxygen-containing gas stream, such as the exhaust stream from a diesel engine, or other lean burn engine, may be oxidized using a mixture of MnOx with one or more other base metal oxides, with or without palladium. The oxidation is effective at temperatures above about 200° C. to convert about ninety percent or more of the carbon monoxide to carbon dioxide and to consume the hydrocarbons. The oxidation is also effective to convert much of the NO to NO2. In general, the mixed base metal oxides may be used as catalysts for the oxidation of nitrogen oxide in hot gas streams containing oxygen. They may optionally be used in a combination with palladium or platinum. But platinum, which is very expensive, does not have to be used in such oxidation reactions.

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