Method to control mercury emissions from exhaust gases

Details Method to control mercury emissions from exhaust gases Method to control mercury emissions from exhaust gases

1999-03-31

2000-10-24

Dunn, Tom

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

423240R, 423240S, 422168, 422169, 422177, B01D 5364

Patent

active

061362816

ABSTRACT:
The present invention relates to a method to catalyze the oxidation of Hg(0) in a flue gas stream prior to standard emissions control equipment. The oxidized mercury has been found to be more condensable than Hg(0) and consequently more easily removed from the gas phase. Accordingly, mercury in its oxidized form can be trapped from a flue gas stream or the like by absorption onto a solid mass or can be more efficiently removed from flue gas streams by wet processes such as a two-stage wet FGD. The gist underlying the inventive concept of the instant invention relates to the use of a porous bed of gold-coated material that is saturated with Hg(0) to the point that the gold in the presence of HCl in the exhaust stream catalyses the oxidation of Hg(0).

REFERENCES:
patent: 3849267 (1974-11-01), Hilgen
patent: 4196173 (1980-04-01), de Jong
patent: 4729882 (1988-03-01), Ide
patent: 5009871 (1991-04-01), Higuchi
patent: 5435980 (1995-07-01), Felsvang
patent: 5514356 (1996-05-01), Lerner

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