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Binary ferrihydrite catalysts

United States Patent

5,580,839
December 3, 1996
View the Complete Patent at the US Patent & Trademark Office
A method of preparing a catalyst precursor comprises dissolving an iron salt and a salt of an oxoanion forming agent, in water so that a solution of the iron salt and oxoanion forming agent salt has a ratio of oxoanion/Fe of between 0.0001:1 to 0.5:1. Next is increasing the pH of the solution to 10 by adding a strong base followed by collecting of precipitate having a binary ferrihydrite structure. A binary ferrihydrite catalyst precursor is also prepared by dissolving an iron salt in water. The solution is brought to a pH of substantially 10 to obtain ferrihydrite precipitate. The precipitate is then filtered and washed with distilled water and subsequently admixed with a hydroxy carboxylic acid solution. The admixture is mixed/agitated and the binary ferrihydrite precipitate is then filtered and recovered.
Huffman; Gerald P. (Lexington, KY), Zhao; Jianmin (Lexington, KY), Feng; Zhen (Lexington, KY)
University of Kentucky Research Foundation (Lexington, KY)
08/ 315,456
September 30, 1994
This invention was made with government support under contract number DE-FC22-90PC90029 awarded by the Department of Energy. The government has certain rights in the invention.