Nitrogen oxides reducing agent and a phosphate
March 10, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3900554 Urea reduction of NOx in combustion effluents Urea reduction of NOx in fuel rich combustion effluents Reduction of NOx in flue gas Multi-stage process for reducing the concentration of pollutants in an effluent Process for nitrogen oxides reduction and minimization of the production of other pollutants Process for reducing the concentration of pollutants in an effluent Process and injector for reducing the concentration of pollutants in an effluent Reduction of nitrogen- and carbon-based pollutants through the use of urea solutions Process for reducing nitrogen oxides without generating nitrous oxide Patent #: 4997631 InventorAssigneeApplicationNo. 209541 filed on 03/10/1994US Classes:423/235, Nitrogen or nitrogenous component423/239.1Utilizing solid sorbent, catalyst, or reactantExaminersPrimary: Straub, Gary P.Assistant: Dunn, Thomas G. Jr. Attorney, Agent or FirmForeign Patent References
International ClassC01B 021/04AbstractProcesses and compositions enable selective noncatalytic reduction (SNCR) in the gas phase at temperatures above 950° C. to reduce the environmental damage caused by NOx and related emissions. By utilizing a nitrogenous NOx -reducing agent, such as urea, in combination with a phosphate at a ratio of nitrogen in the NOx -reducing agent to phosphorous of less than about 50:1, NOx reduction is improved and carbon monoxide, nitrous oxide and ammonia are maintained at low levels.Other References
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