Reactivity of Metal Oxide Sorbents for Removal of H{sub 2}S Page: 3 of 12
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Reactivity of Metal Oxide Sorbents for Removal of H2S
Kyung C. Kwon (kwonk@acd.tusk.edu; (334)-727-8976)
Edward R. Crowe (ecrowe@acd.tusk.edu; (334) -727-8975)
Chemical Engineering Department, School of Engineering and Architecture,
Tuskegee University, Tuskegee, Alabama 36088
Research sponsored by the U.S. Department of Energy's Morgantown Energy Technology Center, under
Contract DE-FG21-94MC31206 with Tuskegee University, Tuskegee, AL 36088; telephone:
(334) 727-8976/(334) 724-4528; fax: (334) 727-8976/ (334) 724-4188
Introduction
Removal of hydrogen sulfide contained in hot coal gases produced from integrated
gasification combined cycle power generation systems is required to protect downstream
combustion turbines from being corroded with sulfur compounds. Removal of sulfur
compounds from hot coal gas products is investigated by using various metal oxide sorbents
and membrane separation methods. The main requirements of these metal oxide sorbents are
durability and high sulfur-loading capacity during absorption-regeneration cycles. In this research,
durable metal oxide sorbents were formulated. Reactivity of the formulated metal oxide
sorbents with simulated coal gas mixtures was examined to search for an ideal sorbent
formulation with a high-sulfur-loading capacity suitable for removal of hydrogen sulfide from
coal gases.
Objectives
The main objectives of this research are to formulate durable metal oxide sorbents with
high-sulfur-loading capacity by a physical mixing method, to investigate reaction kinetics on
the removal of sulfur compounds from coal gases at high temperature and pressure, to study
reaction kinetics on the regeneration of sulfided sorbents, to identify effects of hydrogen
partial pressures and moisture on equilibrium/dynamic absorption of hydrogen sulfide into
formulated metal oxide sorbents as well as initial reaction rates of H2S with formulated metal
oxide sorbents, and to evaluate intraparticular diffusivity of H2S into formulated sorbents at
various reaction conditions.
Experimental Approach
Fresh metal oxide sorbent particles with promising formulas and simulated coal gases
containing hydrogen sulfide are introduced in a 35 cm3 316 stainless steel batch reactor (see
FIGURE 1). The batch reactor, loaded with a fresh sorbent and a simulated coal gas mixture,
is submerged in a fluidized sand bath to maintain the chosen heterogeneous reaction system at
a desired reaction temperature'. Fine metal oxide sorbents are used to minimize effects of
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Kwon, K.C. & Crowe, E.R. Reactivity of Metal Oxide Sorbents for Removal of H{sub 2}S, report, December 31, 1996; Morgantown, West Virginia. (https://digital.library.unt.edu/ark:/67531/metadc677826/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.