Survey of Catalysts for Oxidation of Mercury in Flue Gas
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- 作者：Albert A. Presto ; Evan J. Granite
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：September 15, 2006
- 年：2006
- 卷：40
- 期：18
- 页码：5601 - 5609
- 全文大小：116K
- 年卷期：v.40,no.18(September 15, 2006)
- ISSN：1520-5851
文摘
Methods for removing mercury from flue gas havereceived increased attention because of recent limitationsplaced on mercury emissions from coal-fired utilityboilers by the U. S. Environmental Protection Agency andvarious states. A promising method for mercury removalis catalytic oxidation of elemental mercury (Hg0) to oxidizedmercury (Hg2+), followed by wet flue gas desulfurization(FGD). FGD cannot remove Hg0, but easily removes Hg2+because of its solubility in water. To date, research hasfocused on three broad catalyst areas: selective catalyticreduction catalysts, carbon-based materials, and metals andmetal oxides. We review published results for each typeof catalyst and also present a discussion on the possiblereaction mechanisms in each case. One of the majorsources of uncertainty in understanding catalytic mercuryoxidation is a lack of knowledge of the reaction mechanismsand kinetics. Thus, we propose that future research in thisarea should focus on two major aspects: determiningthe reaction mechanism and kinetics and searching formore cost-effective catalyst and support materials.