Reduction of nitrogen oxides with catalytic acid resistant aluminosilicate molecular sieves and ammonia
Patent 4220632 Issued on September 2, 1980. Estimated Expiration Date: 
September 2, 1997. 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.
September 2, 1997. 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 ReferencesInventorsAssigneeApplicationNo. 05/504793 filed on 09/10/1974US Classes:423/239.2, Zeolite423/237, Ammonia423/403And ammonia as reactantExaminersPrimary: Hearn, Brian E.Attorney, Agent or FirmInternational ClassB01D 53/86 (20060101)AbstractNoxious nitrogen oxides in a waste gas stream such as the stack gas from a fossil-fuel-fired power generation plant or other industrial plant off-gas stream is catalytically reduced to elemental nitrogen and/or innocuous nitrogen oxides employing ammonia as reductant in the presence of a zeolite catalyst in the hydrogen or sodium form having pore openings of about 3 to 10 A.Other References
Field of SearchMolecular oxygen or ozone componentNitrogen or nitrogenous component Mixture is exhaust from internal-combustion engine Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element Group VIII element Including successive stage treatments to modify or remove a different component in each stage |
| ||||||||||||||
