Preparation and Evaluation of Sulfur -Containing Adsorbents for Removal of Mercury From Simulated Coal Combustion Flue Gases
Hsi, Hsing-Cheng
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/83164
Description
Title
Preparation and Evaluation of Sulfur -Containing Adsorbents for Removal of Mercury From Simulated Coal Combustion Flue Gases
Author(s)
Hsi, Hsing-Cheng
Issue Date
2001
Doctoral Committee Chair(s)
Rood, Mark J.
Massoud Rostam-Abadi
Department of Study
Civl and Environmental Engineering
Discipline
Civl and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Environmental Sciences
Language
eng
Abstract
Carbonaceous and non-carbonaceous adsorbents were prepared to evaluate the influences of their physical and chemical properties on the removal of trace amounts of Hg0 and HgCl2 from simulated coal combustion flue gases. These adsorbents include coal-derived activated carbons (CDACs), activated carbon fibers (ACFs), coal fly ash, pistachio shell char (PSC), pistachio activated carbon (PAC), and zeolite adsorbents. Selected samples were impregnated with elemental sulfur at 250--650°C to characterize the samples' properties after sulfur impregnation and to evaluate the adsorbents' Hg0 and HgCl2 equilibrium adsorption capacities. Results indicate that low-cost, high-capacity adsorbents (e.g., CDACs) can be developed from precursors containing inherent sulfur (e.g., coal). The resulting samples, without using sulfur impregnation, achieved mercury adsorption capacities up to 2500 mug/g. Sulfur impregnation increased the sulfur contents, decreased the surface areas, and strongly influenced the mercury adsorption capacities of adsorbents. Sulfur impregnation at a moderate temperature (e.g., 400°C) was shown to be superior and potentially optimal to produce effective carbonaceous adsorbents, which increased the equilibrium mercury adsorption capacities of ACF samples up to 11000 mug/g. These results suggest that the combination of suitable chemical and physical properties of adsorbents contributes to the success of mercury adsorption process. Results shown in this research also clearly indicate that the adsorption mechanism of mercury on the surface of sulfur-containing adsorbents is chemisorption.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
