skip to main content

Title: Survey of catalysts for oxidation of mercury in flue gas

Methods for removing mercury from flue gas have received increased attention because of recent limitations placed on mercury emissions from coal-fired utility boilers by the U. S. Environmental Protection Agency and various states. A promising method for mercury removal is catalytic oxidation of elemental mercury (Hg{sup 0}) to oxidized mercury (Hg{sup 2+}), followed by wet flue gas desulfurization (FGD). FGD cannot remove Hg{sup 0}, but easily removes Hg{sup 2+} because of its solubility in water. To date, research has focused on three broad catalyst areas: selective catalytic reduction catalysts, carbon-based materials, and metals and metal oxides. We review published results for each type of catalyst and also present a discussion on the possible reaction mechanisms in each case. One of the major sources of uncertainty in understanding catalytic mercury oxidation is a lack of knowledge of the reaction mechanisms and kinetics. Thus, we propose that future research in this area should focus on two major aspects: determining the reaction mechanism and kinetics and searching for more cost-effective catalyst and support materials. 91 refs.
Authors:
;  [1]
  1. United States Department of Energy, Pittsburgh, PA (United States). National Energy Technology Laboratory
Publication Date:
OSTI Identifier:
20813179
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Science and Technology; Journal Volume: 40; Journal Issue: 18; Other Information: Evan.Granite@netl.doe.gov
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FLUE GAS; MERCURY; OXIDATION; CATALYSTS; COAL; FOSSIL-FUEL POWER PLANTS; SELECTIVE CATALYTIC REDUCTION; DESULFURIZATION; ACTIVATED CARBON; FLY ASH; METALS; OXIDES; REVIEWS