Method for removing hydrogen sulfide from an emissions stream

Details Method for removing hydrogen sulfide from an emissions stream Method for removing hydrogen sulfide from an emissions stream

2011-08-16

2011-08-16

Johnson, Edward M (Department: 1736)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

C423S244010

Reexamination Certificate

active

07998447

ABSTRACT:
A method of removing hydrogen sulfide from an emissions stream is disclosed, wherein the method includes directing the emissions stream into a hydrogen sulfide converter having a metal oxide catalyst, adsorbing the hydrogen sulfide in the emissions stream to the metal oxide catalyst in the hydrogen sulfide converter, reacting the hydrogen sulfide with at least one of an oxidant and a reductant in the hydrogen sulfide converter to chemically transform the hydrogen sulfide, and adjusting an air-fuel ratio of the emissions stream based on exhaust temperature of an emission control device, where the adjustment varies a duration of at least one of lean and rich operation to perform the adsorbing and reacting even as exhaust temperature varies.

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J.R. Asik et al., “Suppression of Sulfide Emission during Lean NOx Trap Desulfation”, SAE Technical Paper Series No. 2001-01-1299 (Reprinted from: Advanced Catalytic Converters and Substrates for Gasoline Emission Systems (SP-1573)), Mar. 5-8, 2001.
Jon G. McCarty et al., “Thermodynamics of Sulfur Chemisorption on Metals. I. Alumina-supported Nickel”, Materials Research Laboratory, SRI International.

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