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US 7,622,421 B2Granted
Catalysts for low temperature oxidation of carbon monoxide
AssigneePhilip Morris USA Inc.
InventorsSarojini Deevi, Unnikrishnan Pillai
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Abstract
CuO—ZnO—CeO2 catalyst and aged CuO—ZnO catalyst catalytically active for low temperature oxidation of carbon monoxide. The catalysts are co-precipitated, filtered, washed, dried, and calcined. The catalysts can be incorporated into a component of a cigarette or can be used to reduce the concentration of carbon monoxide from a vehicle exhaust emission, a gas used in a laser, a gas used in a fuel cell and/or ambient air undergoing air filtration.
Claims6
A method of forming a copper oxide-zinc oxide catalyst comprising:
- co-precipitating a mixture of copper hydroxide and zinc hydroxide;
- aging the mixture at a temperature of between 50° C. and 70° C. for at least about 3 hours;
- optionally filtering the mixture;
- optionally washing the mixture with deionized water;
- drying the mixture;
- and
- calcining the mixture to form the copper oxide-zinc oxide catalyst.
4 more elements
A method of forming a copper oxide-zinc oxide-cerium oxide catalyst comprising:
- co-precipitating a mixture of copper hydroxide, zinc hydroxide, and cerium hydroxide by drop-wise addition of an aqueous solution of sodium hydroxide to an aqueous solution of copper nitrate, zinc nitrate, and cerium nitrate;
- optionally filtering the mixture;
- optionally washing the mixture with deionized water;
- drying the mixture;
- and
- calcining the mixture to form the copper oxide-zinc oxide-cerium oxide catalyst.
3 more elements
Dependencies are inferred from the claim text.