FUEL 34 |
| The U.S. EPA enacted the Clean Air Interstate Rule, which requires reductions in NOx and SO2 emissions in twenty eight states. An expected consequence of this law is increased deployment of wet flue gas desulfurization for SO2 removal. Among the technologies being considered for mercury abatement in coal-fired utilities is the combination of a catalyst and a wet scrubber; the catalyst oxidizes Hg0 to Hg2+, and the oxidized mercury is subsequently absorbed by the scrubber solution. Catalysts capable of significant conversion (> 80%) of Hg0 to Hg2+ could have tremendous value because the oxidized mercury can be removed concurrently with acid gases during flue gas desulfurization. The use of precious metals and platinum group metals as catalysts for oxidation of mercury in flue gas is an active area of study. To date, field studies have recently focused on gold and palladium catalysts installed at pilot-scale. In this work, we introduce bench-scale results for gold, platinum, and palladium catalysts tested in realistic simulated flue gas. Initial results reveal intriguing characteristics of catalytic mercury oxidation and provide insight for future research. |
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Mercury and Other Trace Elements in Fuel: Emissions and Control
1:25 PM-5:00 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 240/241, Oral
Division of Fuel Chemistry |