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Metal regeneration of iron chelates in nitric oxide scrubbing

United States Patent

5,658,545
August 19, 1997
View the Complete Patent at the US Patent & Trademark Office
The present invention relates to a process of using metal particles to reduce NO to NH.sub.3. More specifically, the invention concerns an improved process to regenerate iron (II) (CHELATE) by reduction of iron (II) (CHELATE) (NO) complex, which process comprises: a) contacting an aqueous solution containing iron (II) (CHELATE) (NO) with metal particles at between about 20.degree. and 90.degree. C. to reduce NO present, produce ammonia or an ammonium ion, and produce free iron (II) (CHELATE) at a pH of between about 3 and 8. The process is useful to remove NO from flue gas and reduce pollution.
Chang; Shih-Ger (El Cerrito, CA), Littlejohn; David (Oakland, CA), Shi; Yao (Berkeley, CA)
The Regents of California (Oakland, CA)
08/ 412,706
March 29, 1995
ORIGIN OF THE INVENTION The present invention was made, in part, under a Department of Energy Contract No. DE-AC-3076SF00098. The U.S. Government has specific rights in this invention.