Mechanisms of Mercury Capture and Breakthrough on Activated Carbon Sorbents
نویسندگان
چکیده
An extensive series of studies was performed at the Energy & Environmental Research Center with mercury (Hgo) sorbents in a thin bed using combinations of various flue gas constituents. This work determined that all the sorbents exhibited breakthrough in about I hour in the full flue gas mixture, and the mercury emitted after breakthrough is an oxidized mercury species. Trapping of the oxidized species and identification by mass spectrometry demonstrated that both carbon and metal oxide sorbents release the relatively volatile mercuric nitrate hydrate when both NO,, SO,, and water vapor are present in the gas phase. Further investigations of treated sorbents allow us to determine the role of oxidation and basic sites on the sorbent in the capture of mercury in NO, and SO, streams.
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