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Mercury removal sorbents

United States Patent

March 29, 2016
View the Complete Patent at the US Patent & Trademark Office
Sorbents and methods of using them for removing mercury from flue gases over a wide range of temperatures are disclosed. Sorbent materials of this invention comprise oxy- or hydroxyl-halogen (chlorides and bromides) of manganese, copper and calcium as the active phase for Hg.sup.0 oxidation, and are dispersed on a high surface porous supports. In addition to the powder activated carbons (PACs), this support material can be comprised of commercial ceramic supports such as silica (SiO.sub.2), alumina (Al.sub.2O.sub.3), zeolites and clays. The support material may also comprise of oxides of various metals such as iron, manganese, and calcium. The non-carbon sorbents of the invention can be easily injected into the flue gas and recovered in the Particulate Control Device (PCD) along with the fly ash without altering the properties of the by-product fly ash enabling its use as a cement additive. Sorbent materials of this invention effectively remove both elemental and oxidized forms of mercury from flue gases and can be used at elevated temperatures. The sorbent combines an oxidation catalyst and a sorbent in the same particle to both oxidize the mercury and then immobilize it.
Alptekin; Gokhan (Boulder, CO)
TDA Research, Inc. (Wheat Ridge, CO)
13/ 834,266
March 15, 2013
STATEMENT REGARDING U.S. GOVERNMENT SUPPORT This invention was made using U.S. government funding through the U.S. Environmental Protection Agency contract No. EP-D-06-087, and Department of Energy contact No. DE-FGO3-01ER83308. The government has certain rights in this invention.